Flight prices can change between search and checkout. Here’s why that happens and how KAYAK tools can help you track fares, compare options and book with fewer surprises.
Why do flight prices change between search and checkout?
Airlines continuously adjust fares and seat availability based on factors such as demand, remaining inventory and booking activity. As a result, the price can change in the few minutes between searching for a flight and completing your booking.
Because airlines update fares based on changing demand and availability, it’s impossible to predict exactly when a specific fare will change. Here are some of the most common reasons:
1. Limited availability within fare categories.
Airlines divide cabins into fare categories, with each containing a set number of seats at a given price. When the last seat in the cheapest category is sold, the next category price kicks in and anyone searching from that point will see the higher fare.
2. Another traveler booking the same fare at the same time.
If another traveler books the last seat in a fare category while you’re entering your details, the lower fare may no longer be available.
3. Changes in demand and inventory.
Airlines build schedules based on demand forecasts, with higher prices for higher demand periods. They update these forecasts with actual booking data as it comes in, adjusting their fares and capacity along the way.
Seats can be released back into inventory as well as removed from it, so prices can go down as well as up.
4. Sales and special offers can end.
Sales and special offers have fixed end times, which can come between searching and booking.
Find your next flight for less.
Do cookies or repeated searches affect flight prices?
Neither enabling cookies nor searching the same route repeatedly will cause KAYAK to raise prices. And clearing your cookies or searching in incognito mode won’t bring down prices either.
The myth about cookies and repeated search is tenacious and understandable. It can feel personal when you search for flights, come back a few hours later and the price has jumped.
But this isn’t because of anything you’ve done, it’s because airlines are constantly updating their fares. So someone searching for the first time on a different device would have seen the same price as you.
Flight search tip:
The best way to track price changes is to set a KAYAK Price Alert. Enter your flight search details and on the results page, switch the Track prices toggle. KAYAK tracks the fares and notifies you of changes so you can see its actual movement.
Who sets the price of a flight?
Airlines and other travel providers set fares using complex computer programs and dynamic pricing models that respond to factors such as demand, availability and booking patterns.
Does KAYAK set flight prices?
No, KAYAK is a travel metasearch engine and doesn’t set any prices. Instead, it helps you find and compare the best flight prices across hundreds of airlines and online travel agencies.
The fares are set and distributed by the airlines and travel companies, and it’s on their platforms that you book and pay for your flights.
When you select a deal on KAYAK, you’re handed over to the provider’s own website. They’ll confirm the fare, take your payment and issue you with confirmation and your travel documents.
So when the price you see at checkout is different, that change has happened in the airline’s or provider’s systems and will be reflected on KAYAK once it updates.
Why can two providers show different prices for the same flight?
Different providers can package and sell flights in different ways and at different prices. This can get confusing when trying to compare flights so it’s worth double-checking the itinerary, cabin and fare types are the same before paying.
A small difference between fees can disappear fast once you add baggage charges to the cheaper one!
When you see different prices for the same flight, it’s usually for one of these reasons:
- Remaining fare inventory: One seller may still have allocated inventory in a cheaper fare category that other sellers have sold out of.
- Baggage and seat selection terms: One price may include a carry-on or checked bag, or advance seat selection while others may only be for the basic fare.
- Fare flexibility: Fares you can change or cancel with lower or no charges typically cost more than those without that flexibility.
- Payment currency: Some sellers price their fares in different currencies, which can be affected by exchange rates.
- Payment conditions: Card fees and surcharges for different payment methods can vary from seller to seller.
- Optional services: Adding extras like insurance and priority boarding will increase the price.
Is the fare I see on KAYAK the final price?
Generally the price you see on KAYAK will be the final price, but fares can sometimes change before you complete your booking, so it’s important to review the final total on the provider’s payment page before you pay.
When’s the best time to book a flight to avoid a price jump?
Our data reveals that while there’s no one best day or time to book your flight, there are trends around how far in advance you book that can help save you money.
Based on average economy round-trip price data from 2026, domestic US flights are cheapest around 21 to 30 days before departure.
International flights had the lowest average prices about one to two weeks before departure. But timing varies by route, carrier and travel season, so treat this as a trend rather than a rule.
The data is based on thousands of routes, but individual fares can behave differently.
What should I check before booking a flight?
The most important things to check before you press that payment button:
Total price – the full amount on the provider’s payment page in the currency you’ll be charged
Itinerary and passenger count – travel dates and times, departure and arrival airports, number of travelers and tickets
Baggage and seat selection – what’s included and what costs extra
Cabin and fare type – cabin class, fare features and terms
Change, cancellation and refunds – what you can change, what it costs and what refunds are available, if any
Payment method and requirements – card surcharges or specific payment requirements, like card type
Optional extras – from priority boarding to insurance, seat upgrades to fast track
FAQs.
Flight prices usually aren’t held. A fare is locked in only once you’ve paid and the provider has confirmed and issued your ticket. Some providers may offer to hold a price for a set period, but that usually comes at a price.
Review the new total before you pay. You can always return to KAYAK and compare other results to see if other providers are still offering the cheaper price. If it’s too high, set a Price Alert so you can track the price and wait to see if it drops again.
Set a KAYAK Price Alert for your route and dates and KAYAK will let you know when the price changes without you needing to check. On the search results page, just switch the Track prices toggle to on and you’re all set.
