To change your JetBlue flight, visit JetBlue’s website, use the mobile app, or call +1-800-230-7697 for assistance. Changes depend on your fare type—Blue, Blue Plus, and Blue Extra fares allow modifications with possible fees, while refundable fares can be changed without penalties. Same-day switches may be available for a fee, subject to availability. If your flight was canceled or rescheduled by JetBlue, you might be eligible for a free change or travel credit.