17 Best Flight Booking Sites for Cheap Airfares

Everything you need to know about the best flight booking sites.
Woman in airport terminal looking at arrivals and departures board (Photo: Shutterstock)
Flight booking sites (Photo: Shutterstock)

If you’re flying, your main priority is to find the best flight for your specific travel needs. That could mean the cheapest flight, or the one with the best schedule, or the one that has the best seats still available. The best flight booking sites let you sort through all of these details quickly and easily.

The most important thing to understand when searching for flights online is the difference between an online travel agency (OTA) and metasearch system.

  • A metasearch flight booking website searches multiple airline ticket sellers. Examples of metasearch sites include Kayak, Google Flights, and Momondo.
  • An online travel agent (OTA) is a true flight booking site because it actually sells you the ticket. Among the best known OTAs are Expedia, Hotwire, and CheapOair.

In this story, I’ll explain the pros and cons of the best flight booking sites in both categories and offer tips for using them to find the cheapest and most convenient flights.

How to Use This Story about Flight Booking Sites

  • Click on any of the flight booking sites in the list below to go straight to the site and start your search for the cheapest airfares. 
  • Scroll down to read my review detailing what you’ll get from each of these flight booking sites, including how to compare prices and find deals on flights that fit your budget, trip plans, and travel party size.
  • Read my flight booking tips (click on the link to jump down to that part of the story or just scroll down) to get more advice and clever tricks for maximizing your airfare savings.

How we review these flight booking sites: Read our methodology for selecting and recommending booking sites.

The Best Flight Booking Sites for Finding Deals

Metasearch Sites:

  1. Kayak
  2. Google Flights
  3. Momondo
  4. Skyscanner
  5. Trivago
  6. Travelzoo
  7. TripAdvisor Flights

Online Travel Agencies:

  1. CheapOair
  2. OneTravel
  3. Expedia
  4. Orbitz
  5. Travelocity
  6. Hotwire
  7. Hopper (App)
  8. Kiwi.com
  9. Priceline
  10. Skiplagged

Best Metasearch Flight Booking Sites: My Unbiased Reviews

1. Kayak

Screenshot of Kayak Flight Search
Kayak has helpful filters, an easy-to-understand interface, and price tracking emails (Photo: Kayak)

What Kayak Does Best

Kayak has a huge number of loyal users, and with good reason. This longtime favorite owned by Booking.com is clear and easy to use with filters for nonstop flights, bag charges, specific airlines, connecting airports, and so on.

Details of Kayak’s Flight Search

Kayak’s flight search additionally allows you to enter the number of bags you want to check as an initial filter on all search results—a particularly nice feature for families flying with kids. You can also sort fares by “cheapest,” “best,” and “quickest.”

If you’re watching a particular route, you can opt into price tracking emails so you’ll be the first to know if the price drops. 

2. Google Flights

Screenshot of Google Flights
Google Flights is a metasearch flight booking site that delivers a good initial look at the cost of fares (Photo: Google Flights)

What Google Flights Does Best

You can’t go wrong with Google Flights. It’s based on the ITA Software system, which Google acquired and which is the back-end system for many other metasearch flight booking sites. Google Flights is particularly good for providing a quick look at optional dates.

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Details of Google Flight’s Search Function

When you first enter your trip dates, the entry calendar automatically shows fares for each day for a two-month period on the calendar. You can also select a display showing fares to/from whichever nearby airports you choose.

Google Flights offers several other useful filters, too, such as for nonstop flights, bag charges, specific airlines, and connecting airports. Google Flights also gives you price histories on routes so you can see before you book if the fare is higher or lower than average. 

3. Momondo

Screenshot of Momondo flight booking site
Momondo mixes standard filters with niche search tools like airline alliance filters (Photo: Momondo)

What Momondo Does Best

Like Kayak, Momondo is a metasearch site owned by Booking.com with some unique features. In its listings, Momondo’s flight search flags “cheapest” and “best” options, and highlights fares with flexible change policies. It combines standard filters like airline, number of stops, and nearby airports with helpful-but-niche filters like airline alliance, layover duration, and type of aircraft. Like Kayak, Momondo allows you to sort fares by “cheapest” and “best,” and also has the option to arrange flights by lowest CO2 emissions.

Details of Momondo’s Flight Search

Momondo also offers price alerts and has handy bar graphs that show fare differences around your dates. And unlike most metasearch flight websites, Momondo is introducing some of its own fares, which can be booked directly on the site, into the mix.

Momondo also adds opaque fares from “major airlines” that the site does not identify until you buy the flight. Those fares are often lower than openly posted fares by individual lines. Opaque searching is basically the original Priceline shtick; no surprise, given that Momondo and Priceline are both owned by the same parent company.

Momondo also mixes in alternative forms of transport, like bus fares, which can be an interesting point of comparison even if you prefer to fly.

4. Skyscanner

Skyscanner flight booking site homepage
Skyscanner pulls fares from many different ticket sellers, and sets itself apart with the addition of user ratings (Photo: Skyscanner)

What Skyscanner Does Best

If you’re not already using Skyscanner as one of your standard flight comparison sites, you should be. While the flight booking metasearch site has a pretty standard set of filters including number of stops, departure times, airlines, and alliances, it does tend to find good fares, and its additional features makes it a standout.

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Details of Skyscanner’s Flight Search

You can search with just your departure city in mind to browse cheap fares to many destinations by choosing the “Everywhere” option when you search. Search results are categorized into “best,” “cheapest,” and “fastest,” which can be hugely helpful depending on what’s more important to you, finding the cheapest flight or the most convenient one. Skyscanner also clearly marks “Greener choice” flights, those flights that emit less carbon dioxide than average flight for your search.

Skyscanner pulls fares from a lot of different ticket sellers, but addresses the “Can I trust this company I’ve never heard of?” question by offering extensive user reviews of each seller. And it offers alerts for cheap flights, so you can be among the first to know if the fare on your route drops. 

5. Trivago Flights

Trivago's new flight booking site with a simple interface
In addition to its better-known hotel metasearch, Trivago also has flight listings (Photo: Trivago)

What Trivago Does Best

The metasearch site Trivago now offers flight listings as well as hotels. Its airfare listings are both competitively priced and easy to browse. Trivago pulls fares from hundreds of sources, including airlines websites and OTAs.

Details of Trivago’s Flight Search

While its flight search box is pretty barebones, the results pages have plenty to recommend them, including a fare trend box that advises whether it’s better to book now or wait.

Trivago’s airfare search results also include filters like number of stops, change fees, mode of transportation (which can include trains and buses along with flights), layover airports, and more.

There’s also a “fee assistant” that lets you specify number of carry-on and checked bags so you can get an accurate read on fares.

6. Travelzoo

Screenshot of Travelzoo homepage
Travelzoo is a great site for booking airfare if you have flexible dates or are open to a variety of destinations (Photo: Travelzoo)

What TravelZoo Does Best

Similar to the OTA Kiwi.com, Travelzoo is among the best sites for booking airfare if you’re not looking for a specific date/destination combination. Instead, Travelzoo excels at finding affordable flights to families who know they want to go on vacation, but who don’t have specific plans in mind.

Details of TravelZoo’s Flight Search

You can put in departure and destination parameters, but in our searches, this often didn’t yield flights. You’re better off browsing the featured deals, which include flights deals, change often, and highlight short-window offers.

Each week, Travelzoo features a Top 20 list of great airfare, air-inclusive vacation package, and cruise deals. Deals are reviewed in a narrative style, so you get a sense of why it’s a good offer before you click through to the provider. 

7. Tripadvisor Flights

Screenshot of TripAdvisor flight booking site
Tripadvisor Flights mix in the site’s signature user reviews with flight listings (Photo: TripAdvisor)

What Tripadvisor Flights Does Best

Tripadvisor Flights offers similar functionality to Google and Kayak but differentiates itself with a user-review angle.

Details of Tripadvisor Flights’ Search Function

Clicking through on a particular fare yields detailed user reviews of the airline(s), rated by factors including legroom, seat comfort, customer service, cleanliness, and onboard experience.

On the downside, Tripadvisor Flights doesn’t offer the same fare pricing history and trend predictions that some of the other metasearch flight booking sites provide. 

Best Online Travel Agent (OTA) Flight Booking Sites: My Unbiased Reviews

1. CheapOair and OneTravel

Screenshot of Cheapoair and OneTravel flight booking sites
Cheapoair and OneTravel are both owned by the same company, but airfare prices aren’t always the same (Photo: Photo: Cheapoair and OneTravel)

What CheapOair and OneTravel Do Best

CheapOair and OneTravel are both owned by Fareportal. Since the layout and filters are very similar, we’re reviewing them together here. However, the airfare prices aren’t always identical, so it can be worth checking both sites in your airfare search. Note that both also charge a booking fee that varies by flight.

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Details of CheapOair and OneTravel’s Flight Search

Filters include number of stops, layover times, airports (you can add in other nearby airports to both your departure and arrival city list), airlines, flight times, and so on. Prices are listed in a matrix at the top of flight search results, and you can search by class of service—including premium economy, business class, and first class. There’s also clearly labeled additional information about flight cancellation flexibility.

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2. Expedia, Orbitz, and Travelocity

screenshots of the home pages of airfare booking sites Expedia, Orbitz, and Travelocity
Though Expedia, Orbitz, and Travelocity are all airfare booking sites owned by Expedia, they sometimes offer different prices (Photo: Expedia, Orbitz, Travelocity)

What Expedia, Orbitz, and Travelocity Do Best

Expedia, Orbitz, and Travelocity are all owned by Expedia, and offer similar user experiences across all three sites. They all do a great job clearly displaying flexible change policies. Icons on each of the flights listed make it easy to check for things like in-flight WiFi and in-seat power. You can also quickly scan to see what extra fees (seat choice, carry-on and checked bag fees, etc.) an airline charges on a flight by clicking on a specific flight.

Details of Expedia, Orbitz, and Travelocity’s Flight Search

Prices on these flight booking sites tend to be the same or similar (a few cents or dollars difference) in most cases, but if the lowest price is your priority, it’s a good idea to compare prices across Expedia flights, Orbitz flights, and Travelocity flights.

On each of the sites, you’ll get standard filters including number of stops, airlines, departure and arrival times, and whether or not to include nearby airports. You can also opt to “Show flexible dates” to get a matrix that helps you see the cheapest days adjacent to your search. 

3. Hotwire 

homepage of flight booking site Hotwire
Hotwire allows you to surface fares with no change or cancellation fees (Photo: Hotwire)

What Hotwire Does Best

The flight booking feature for Hotwire offers a pretty standard major OTA layout, with the same filters as Expedia and the other biggies. There’s a seamless and easy-to-use (if you know it’s there) flexible date matrix at the top of the search results page, and you can sort flights by number of stops, airline, and so on.

Details of Hotwire’s Flight Search

Particularly useful is the set of filters that allow you to surface flights with no change fees, no cancellation fees, no extra charge for carry-ons, and flights that come with the ability to choose your seat at no additional charge.

One important thing to note about Hotwire is that it really wants you to use its app—so much so that it says that the lowest prices are only available in the Hotwire app. So if price is your primary motivator, the app should be the primary way you use Hotwire.

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4. Hopper

Hopper flight booking app home page
Hopper is a flight booking app with predictive powers (Photo: Hopper)

What Hopper Does Best

A flight booking app, Hopper touts its ability to predict prices with 95 percent accuracy up to a year in advance. From my testing over the years, I don’t know if it’s quite that accurate, but it’s pretty close.

Details of Hopper’s Flight Search

Input your departure and destination cities, then specify your dates using the color-coded calendar (so you can see as you’re selecting price differences in your date range). You’ll then see the lowest price along with advice about whether you should book now or wait for prices to drop. There’s a Price Prediction section that outlines when prices are likely to rise or drop.

There are other features as well, including the fee-based Price Freeze, which allows you to lock in the price you see without needing to book for seven days. There’s a lot of useful information, but also a lot of vertical scrolling to find it all, since this is a mobile-based app. Filters are minimal but include layover lengths and listing or hiding basic fares (that are cheaper but have a lot of restrictions). 

5. Kiwi.com

Screenshot of Kiwi.com flight booking site homepage
Kiwi.com is an OTA that works especially well for complicated trips (Photo: Kiwi.com)

What Kiwi.com Does Best

You can use Kiwi.com as an OTA if you’re looking for a simple round-trip, but where this flight booking site really excels is in complex, multi-step itineraries.

Details of Kiwi.com’s Flight Search

Kiwi lets you start with a budget and a flexible plan to craft multi-country or multi-region trips, so its filters are set to combine flights, buses, and trains (you can uncheck the transportation types you want to avoid). It also allows you to exclude countries you don’t want to pass through on your trips.

To use Kiwi to its fullest, use the filters (duration, stops, countries, etc.) to build a framework and see what it returns. Flights tend to be surprisingly affordable, though you are likely to have to give up some convenience in terms of connection times and layovers.

Kiwi.com’s Nomad tool takes things a step further: You create your bucket list of destinations, specify any time constraints, and find the most affordable way to piece together your destinations into a single trip. 

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6. Priceline

Screenshot of Priceline flight booking site
Priceline’s airfare search doesn’t have a lot of bells and whistles, but it’s easy to use and lists competitive fares (Photo: Priceline)

What Priceline Does Best

With Priceline you’ll find a clean layout with limited but standard filters like number of stops, time of day, and airline. Flights with no change fees are marked clearly. Icons under flight prices show what’s included and not (carry-on bags, checked bags, and seat selection) in the fare.

Details of Priceline’s Flight Search

In flight search results, Priceline shows little icons under prices to identify flights that have included carry-ons, seat selection, and checked bags. In a retro twist, Priceline also advertises its phone number (855-940-4266) that you can call for flight deals as well.

7. Skiplagged

Screenshot of Skiplagged.com flight booking site
Skiplagged allows you to search both regular airfares and more controversial hidden-city options (Photo: Skiplagged.com)

What Skiplagged Does Best

Skiplagging is the practice of using “hidden-city ticketing” (i.e., a flight connection airport as your final destination to save money) is reviled by the airlines. And while it’s not illegal, airlines can do things like confiscate your frequent flier miles if they catch you doing it. The airfare booking site Skiplagged allows you to search for these hidden-city fares, but it’s also a great place to find totally above-board fares. I tested it for those legitimate fares.

Details of Skiplagged’s Flight Search

The key to using Skiplagged in a way that isn’t going to get you in trouble with an airline is to uncheck the “Hidden-City” box at the top of the list of filters. Filters are standard, but Skiplagged doesn’t show a lot of extra information the way many airfare booking sites do. You can’t scan search results to see which offer easy cancellation, or have enhanced cleaning policies, or offer in-seat power.

But, in a sea of OTAs and metasearch sites that tend to return very similar fares, Skiplagged—even the standard, non-hidden-city fares—somehow manages to find lower-than-average fares a noteworthy amount of the time. However, note that Skiplagged really is focused on price over convenience, so if your measure of good value in an airline ticket includes fewer stopovers, Skiplagged may not be your best fit.

Tips on How to Find the Best Flight Deals

Flight searches today are more complicated than searches a decade ago when the mix of services and amenities was pretty standard among all major airlines. Now that so many formerly standard features (like being able to bring carry-on baggage, etc.) are now extra-cost options, flight searches that mix standard economy fare for some airlines with pared-down basic economy for others don’t deliver an apples-to-apples comparison, and make true cheap flight comparisons difficult. 

Just about every metasearch and OTA comparison site allows filtering for the most basic factors: nonstop flights, specified airports, and the ability to display fares for a range of possible dates. No single site is best at everything, but some do especially well in certain searches important to families.

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Many prior studies of the “best” airfare search sites have come to the same conclusion: Fares often vary among them, with no one site consistently better or worse than others. If you’re looking to trim the last penny off your plane tickets, try as many flight booking sites as your patience permits.

Never forget to check with individual airlines for flight deals, too. Checking Southwest is essential if the airline flies where you’re going. It does not allow metasearch or OTA sites to display its fares. Also, individual airline sites often offer more useful first-screen options.

How Flight Search Websites Should Work (But Don’t)

No metasearch flight booking site or OTA yet offers an ideal search formula, which I think would look something like this: You first enter the number of bags you want to check and carry on, whether you want assigned seats (especially important for families), whether you want inflight meals, whether you want extra legroom, and what degree of refundability you need.

The flight search engine would then return apples-to-apples fare comparisons: What you pay for the specific requirements for your family trip. The technology to do this is available, and some components are already being done, but so far nobody has assembled all the parts. Let’s hope some enterprising OTA or metasearch system gets it done.

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Additional reporting by Christine Sarkis.

Ed Perkins
Ed Perkins is a longtime consumer advocate and reporter. He spent 25 years in travel research and consulting and was founding editor of Consumer Reports Travel Letter. His travel expertise has led to frequent television appearances, including ABC's Good Morning America, The CBS Evening News, CNN, and numerous local TV and radio stations.