You can cancel your Alaska Air flights within 24 hours of booking for a full refund, or you can change your travel plans without paying a change fee. If you have a flight reservation with Alaska Airlines but need to change your travel plans at the last minute. You can make Alaska Airlines flight cancellation two ways: online or by phone. To start the cancellation process, you must have your flight confirmation number to enter or give to the aviation official. Once the cancellation procedure for Alaska Airlines has been completed, you will be informed of the alternatives available for a refund. For a fee, some airlines may allow you to change or cancel reservations. If you are curious how much it will cost to cancel it depends on the Alaska Airlines trip in question.