How do I ask for an upgrade on United?

If you want to request an upgrade for an existing United reservation, you have three options to request for United Airlines seat Upgrade:

1. Sign in to your MileagePlus account and make a request online.
2. Call the reservations line or the Premier Priority Desk number on your digital membership card.
3. Talk to an agent at the airport check-in counter or your gate.

If you need more information about United Request Upgrade you can contact United Airlines customer service or get details by reading a blog on Airlines Group Travel at the mentioned link.