To change or upgrade your SWISS flight, visit the "Manage Your Bookings" section on their official website. For assistance, call +18002307697 to speak with a representative. Log in with your booking reference and last name to modify your itinerary, subject to fare conditions and availability. To upgrade, consider the Bid Upgrade program, which allows passengers to bid for Business Class seats. Ensure changes are made at least 24 hours before departure to avoid penalties. ​