Yes, JetBlue Airlines does allow cancellations. Passengers can cancel their JetBlue flights under certain conditions, subject to the airline's cancellation policy you can call their hotline phone number 1-855-ADA-LINE (232-5463)/ 1-844-604-2944 (???????????????????? ????????????????????????????). Depending on the fare type and timing of the cancellation, passengers may be eligible for a refund or a travel credit for future use.