To cancel your JetBlue flight, call +1-877-450-1027 or visit the JetBlue website. Log in, go to "Manage Trips," and select the flight you want to cancel. Follow the prompts to complete the cancellation. Refunds depend on your fare type—Basic Blue fares are non-refundable, while other fares may receive a JetBlue Travel Credit or refund. Same-day cancellations may have additional fees. Contact JetBlue customer support for assistance and review their cancellation policy before making any changes.