How To Upgrade United Flight After Check-in

To upgrade your United flight after check-in, call +1-833-770-4333 or visit United’s official website or app to manage your booking. By calling +1-833-770-4333, you can request seat upgrades, use MileagePlus points, or pay for premium seating options. United Airlines allows upgrades even after check-in, depending on seat availability and fare type. Simply log in to “My Trips,” select your flight, and choose “Upgrade.” Calling +1-833-770-4333 ensures faster assistance and better chances to secure your preferred upgrade before departure.