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After 24 hours:- Just like any flights booking, United flights can be cancelled more than 24 hours after purchase. However, you may or may not get a refund, depending on the type of fare purchased. Even if your booking isn’t eligible for a refund under United’s flights refund policy, you still may be able to get a credit from the airline. If you’re not sure what type of fare you bought, check your itinerary for airline policies and rules.