Change Your Flight or Cancel and Rebook? How to Tell Which Costs Less

By the SlickFlight travel desk · Published November 2, 2026 · Facts checked November 2, 2026

If your plans move and you hold a non-refundable ticket, changing the flight is almost always cheaper than cancelling and booking again. Cancelling doesn't give you your money back. It gives you a credit with the same airline, and then you buy the new ticket at today's price on top.

There are three situations where cancel and rebook does win, and one where it's the only option. Here's how to tell which one you're in.

Why changing usually wins

When you change a ticket, the airline keeps the value you already paid and charges only the difference to the new flight. United, Delta and Southwest's Choice fares don't add a change fee on most domestic trips, so the difference is the whole cost.

When you cancel a non-refundable ticket, the value becomes a credit. Delta returns it as an eCredit, United as a future flight credit, American as travel credit, Southwest as a flight credit. Then you buy the new flight separately. You end up spending the full new fare now and holding a credit you have to remember to use, under its own expiry rules.

The rules side by side

Basic fares break this table at every airline. United Basic Economy can't be changed until you upgrade it. American Basic Economy can't be changed after 24 hours. Delta Basic charges a change fee plus the fare difference. Southwest Basic changes only by upgrading the fare.

When cancel and rebook is the better move

Inside the first 24 hours. US rules require airlines to either refund in full within 24 hours or hold a fare for 24 hours, for tickets bought at least seven days before departure. United, Delta and American all refund in that window. If you spot a cheaper fare or a better flight on the day you booked, cancel for the cash refund and buy the new ticket. Don't "change" in that window and lose the refund option.

On a refundable fare. If your ticket refunds to your card, as Delta Extra, Southwest Choice Preferred and Choice Extra, and other fully refundable fares do, cancel for the refund and buy whatever you like. There's no credit to manage.

When the fare dropped on the same flight. On United, moving to a cheaper flight gives you a future flight credit for the difference. On Southwest, moving to a lower fare creates a flight credit. Neither puts cash back on your card, but the credit is free money with that airline. It's worth checking your trip when fares fall.

When you're switching airlines. A change can't move you to a different airline. If the right flight is on another carrier, cancelling is the only route, and the credit stays with the first airline. That's fine if you'll fly them again before it expires.

The traps that cost money

• Not cancelling before departure. Delta says a ticket that isn't changed or cancelled before the flight leaves has no remaining value. Southwest requires cancelling at least 10 minutes before departure or the funds can be forfeited. If you can't make it, cancel first and decide later.
• The expiry clock. Delta's eCredit usually runs from the original purchase date, not the cancellation date. Southwest credits used to pay for a new booking pass their earliest expiry date to any credit that booking later creates. Rebooking doesn't buy you time.
• Names. United's future flight credits normally have to be used by the original traveler, and Delta asks for the original ticket holder's name to redeem an eCredit. Cancelling and rebooking for a different person usually means paying fresh.
• Extras. American travel credit can't pay for seats, upgrades or bags, and airport-paid bag and seat fees on the cancelled trip aren't refunded.
• Phone changes. United notes a change made by phone can carry a fee. Changing in the app or on the website is the cheaper path.

How to decide in two minutes

1. Is it within 24 hours of booking, and was the flight at least a week away when you booked? Cancel for a refund, then rebook.
2. Is the fare refundable? Cancel for the refund, then rebook.
3. Are you staying on the same airline? Change the flight in the airline's app or My Trips and pay only the difference.
4. Are you moving to a different airline? Cancel before departure, keep the credit and note its expiry, then buy the new ticket.

A ticket you bought from the airline is changed in that airline's own app or website; SlickFlight can't change it for you. If you're moving to a different airline or the new trip needs a fresh ticket, a SlickFlight planner can price the options side by side before you buy.

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