JetBlue's cancellation policy depends on the fare type: most fares (Blue, Blue Plus, Blue Extra, Mint) have no change or cancellation fees, only the fare difference applies. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Blue Basic fares allow cancellation for a fee, with the amount varying by route, or can be changed for a fee. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) All reservations can be cancelled without penalty within 24 hours of booking if made at least a week before departure. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) For most other flights, changing or canceling online or via the Manage Trips page is the best way to avoid a $25 service fee.