Are you wondering, Can I upgrade my United seat after purchase? The answer is; yes; definitely, you can upgrade your United Airlines seat after purchasing the flight tickets. The airline's seat upgrade policy is flexible. A significant thing to remember is that you can upgrade your seat only if there is availability.

Suppose you have booked your flight ticket and wish to upgrade it. Then go through these steps:

Upgrade your seat on the website of the airline.

Seats can be upgraded on the official website of the airline. To know the process of seat upgrade, go through the steps mentioned below:

Open the official website of the airline.
Go to My Trips and fill in your booking details, such as confirmation number and last name.
Then, click on Search. After that, select the flight where you want to upgrade your seat.
Go to the seat upgrade and check the availability of seats. 
If the seat upgrade is available, then choose your new seat.
Pay the required fee and click on confirm. Then, your seat will get upgraded. 
Contact customer service.

You can call the customer service executives regarding your seat upgrade request. The contact numbers are available on the website of the airline. Go to the Help section and look for contact support. Place the call and ask the executives to upgrade your seat.

Select Auto-upgrade at the time of booking.

When booking your seat, you will be given an option of seat auto-upgrade if you select it. Then, whenever there are available seats, the airline will automatically upgrade your seat. You can opt for this option if you need no time to upgrade your seat manually.

Conclusion:

If you need assistance from the customer support staff regarding your seat upgrade policy, you should talk to a real person at United Airlines. They will either do the seat upgrade for you or guide you through making changes yourself.