Flight Search Sites Compared: What Each One Does Well
What these sites actually do differently
Flight search sites all pull from the same airline databases, so you will find the same flights on Google Flights, Kayak, Skyscanner, and Expedia. The difference is in how they show you the results, what filters they offer, and what happens when you book. Some sites are faster at loading. Some let you see prices across a full month at once. Some show you which airline is cheapest versus which route is cheapest. Some take you directly to the airline to book; others keep you on their own checkout page. None of these differences is small when you are comparing hundreds of flights.
The sites also make money differently. Google Flights, Kayak, and Skyscanner do not charge you a booking fee — they earn money when you click through to an airline or travel agent. Expedia, Orbitz, and Priceline own their own booking systems and keep a cut of the ticket price. That does not make one model better than the other, but it shapes what each site prioritizes showing you.
Key Takeaways
- Google Flights shows prices across an entire month on one calendar, which is the fastest way to find the cheapest travel dates.
- Kayak and Skyscanner let you filter by specific things like number of stops or departure time, and both show you the airline's own website price alongside third-party prices.
- Expedia and Priceline bundle flights with hotels and rental cars, which can save money if you need all three, but their flight-only prices are often higher than what you will find elsewhere.
- Google Flights and Kayak both have price-drop alerts, but they work differently — Google watches specific routes, while Kayak watches your saved searches.
- Booking directly on the airline website guarantees you are seeing the lowest price the airline offers, but you lose the ability to compare across airlines in one place.
Google Flights: Best for seeing prices across dates
Google Flights loads fast and shows you a full calendar of prices for every day in a month. Click on any date and the price updates instantly. This is the single best tool if you have flexible travel dates and want to know which day is cheapest. You can also set a price alert for a specific route, and Google will email you when the price drops or rises.
The downside: Google Flights does not let you book on the site. You click a price, and it takes you to the airline's website or to a third-party seller like Kayak or Expedia. This extra step is not a problem, but it means you are leaving Google's interface to complete the purchase. Google also does not show you as many filter options as Kayak or Skyscanner — you can filter by number of stops and price range, but not by specific departure times or cabin class as easily.
Kayak and Skyscanner: Best for detailed filtering
Kayak and Skyscanner are nearly identical in what they do. Both let you filter by departure time, arrival time, number of stops, airline, price range, and flight duration. Both show you the price on the airline's own website next to the price on third-party booking sites, so you can see if booking direct saves money. Both have price alerts that watch your saved searches and notify you of changes.
Kayak has a slight edge in speed and interface design — the site loads faster and the filters are easier to adjust without reloading the page. Skyscanner is stronger internationally; if you are searching from outside the United States or booking a flight that crosses many countries, Skyscanner often has more options and better pricing data. Neither site lets you book directly; both send you to the airline or a third-party seller to complete the purchase.
Expedia and Priceline: Best if you need a hotel or car too
Expedia and Priceline are booking sites first, flight search sites second. Their main advantage is bundling: if you need a flight, a hotel, and a rental car, booking all three together can lower the total cost. Expedia's bundle discount is usually 5 to 15 percent off the combined price. Priceline's "Express Deals" offer deeper discounts on hotels if you book the flight and hotel together, but you do not know the exact hotel until after you book.
If you only need a flight, Expedia and Priceline are usually more expensive than Google Flights, Kayak, or Skyscanner. They take a commission on every ticket, and that cost is built into the price you see. You also book and pay on their site, not on the airline's site, which means if something goes wrong with your booking, you have to contact Expedia or Priceline first — the airline will direct you back to them. Both sites do let you filter by stops, time, and price, and both have price alerts.
Booking direct on the airline website
Every airline sells tickets on its own website. Booking there guarantees you are seeing the airline's lowest price, because the airline will not undercut itself on a third-party site. You also deal directly with the airline if your flight is cancelled or delayed, and you can manage your booking (seat selection, checked bags, changes) without logging into a third-party account.
The trade-off is that you can only see one airline at a time. If you are comparing five airlines on the same route, you have to visit five websites. For that reason, most people use a search site to find the cheapest option, then book on the airline's website to lock in that price. Some people also book on a search site if the price is the same, because it keeps all their bookings in one place.
Price alerts and how they work
Google Flights, Kayak, and Skyscanner all offer price alerts, but they work in different ways. Google Flights watches a specific route (New York to Los Angeles, for example) and emails you when the price for that route changes. You set it once and it runs until you turn it off. Kayak and Skyscanner watch your saved searches, which means they track the exact filters you used — if you saved a search for flights departing between 6 a.m. and 9 a.m., the alert only watches flights in that time window.
None of these alerts may provide you the lowest price. They tell you when a price has moved, but "moved" does not always mean "lower." A price alert is most useful if you have already found a flight you like and want to know if it gets cheaper before you book. If you are still in the research phase, checking the site every few days is often faster than waiting for alerts to arrive.
Hidden fees and what you actually pay
The price you see on a flight search site is not always the price you pay. Most sites show the base fare, then add taxes and fees at checkout. Taxes are set by the government and are the same everywhere. Fees vary: baggage fees, seat selection fees, and payment processing fees are added by the airline or the booking site.
Google Flights, Kayak, and Skyscanner usually show taxes in the price you see, so the final price at checkout is close to what you expected. Expedia and Priceline sometimes show the base fare first, then add taxes and fees later. Always scroll down to see the full price breakdown before you click "book." If a price looks too good to be true, check the fees section — sometimes a cheap base fare has expensive baggage or seat fees attached.
Frequently Asked Questions
Do I save money by booking on a search site or the airline website?
The price is usually the same. Search sites like Kayak and Google Flights show you the airline's own price alongside third-party prices, so you can see if one is cheaper. If they are the same, book wherever is easiest for you. If the airline's website is cheaper, book there. If a third-party site is cheaper, that price is real — the airline allows it.
Why does the same flight cost different amounts on different sites?
It usually does not. If you see the same flight at different prices, one of these is happening: the sites are showing different dates or times, one site is showing the base fare without taxes, or one site is adding fees that the other is not. Check the full price breakdown on each site, including taxes and fees, before you compare.
Should I set a price alert or just check the site myself?
Price alerts are useful if you have a specific trip in mind and want to know if the price drops before you book. If you are still deciding when to travel, checking the site yourself every few days is faster. Alerts can take hours to send, and by then the cheap price may be gone.
What happens if I book on a search site and the airline cancels my flight?
The airline is responsible for your refund or rebooking, not the search site. Contact the airline directly with your confirmation number. The search site is just the middleman. If the airline is hard to reach, you can also contact the search site and ask them to help, but the airline has the final say.
Can I book a flight on one site and a hotel on another?
Yes. There is no rule that says your flight and hotel have to come from the same company. You might find a cheaper flight on Google Flights and a cheaper hotel on Booking.com. Book them separately. The only advantage to booking together is the bundle discount on Expedia or Priceline, and that discount does not always beat booking separately.