Header Notice

Winter is here! Check out the winter wonderlands at these 5 amazing winter destinations in Montana

How To Add Your MileagePlus Number To A Reservation

Published:

Modified: 5 October 2026

by Francyne Moon

How To Add Your MileagePlus Number To A Reservation

To add your MileagePlus number to a reservation, access the booking through the "My Trips" section on the United website or app. The simplest method requires you to have the reservation linked to your account, though you can also contact customer service or your travel agent for assistance. Visit the United Airlines website or use the United mobile app, navigate to "My Trips," and look for the frequent flyer field to enter your number.

Step 1: Accessing the Reservation

The first step in adding your MileagePlus number to a reservation is accessing the reservation itself. Depending on how you made the reservation, there are different methods to access it. Let's explore the various options:

  1. If you made the reservation online:
    • Visit the United Airlines website.
    • Sign in to your account using the login credentials associated with the reservation.
    • Navigate to the "My Trips" section of the website.
    • Locate the specific reservation you wish to update.
  2. If you made the reservation through a travel agent:
    • Contact your travel agent and provide them with the necessary details of your reservation, such as the booking reference or confirmation number.
    • Ask your travel agent to assist you in accessing the reservation and adding your MileagePlus number.
  3. If you made the reservation over the phone:
    • Contact the airline's customer service department and provide them with the required details about your reservation.
    • Ask the representative to help you access the reservation so you can update your MileagePlus number.

Once you have successfully accessed the reservation, you're ready to proceed to the next step and locate the section where you can add your MileagePlus number. Remember to have your MileagePlus membership number handy as you will need it for the next steps.

Step 2: Locating the MileagePlus Number

In this step, we will guide you through locating where to add your MileagePlus number within your reservation.

  1. If you are accessing your reservation online:
    • Visit the United Airlines website.
    • Navigate to the "My Trips" section of the website.
    • Look for a tab or link labeled "My Trips" within your account dashboard or profile.
    • Click on the relevant tab or link to access the specific reservation you want to update.
    • Once on the reservation details page, scroll down or navigate through the options until you find a section related to your frequent flyer or loyalty program.
    • Within that section, look for a field or box labeled "MileagePlus number" or similar.
  2. If you are working with a travel agent:
    • Ask your travel agent to guide you to the section where you can add your MileagePlus number.
    • They will assist you in locating the relevant area within the reservation details.
  3. If you are contacting the airline's customer service:
    • Ask the customer service representative to direct you to the appropriate place within the reservation where you can update your MileagePlus number.
    • They will provide specific instructions to locate and access that section.

Take your time to explore the tabs, links, or sections until you find the designated area. Once located, move on to the next step to add your number and receive your membership benefits.

Step 3: Adding the MileagePlus Number

Once you've accessed the reservation in the "My Trips" section, locate the field labeled "MileagePlus number" or a similar description within the reservation details.

  1. Click on the field or box labeled "MileagePlus number" within the reservation details.
  2. Enter your MileagePlus number carefully in the provided space. Double-check to ensure accuracy.
  3. If there are additional fields related to your MileagePlus account, such as a membership tier, fill in the necessary details.
  4. Review your input to ensure it is correct and complete.

If you encounter issues finding the designated area to add your MileagePlus number, contact United's customer service for guidance. They can provide specific instructions or troubleshoot problems.

Adding your MileagePlus number is crucial to ensure you receive credit for your flights and access membership benefits. Take a moment to ensure your information is accurately entered before proceeding.

Step 4: Confirming the Update

After adding your MileagePlus number to the reservation, confirm that the update was successful. This ensures your membership information is properly linked and that you will receive the associated benefits and rewards. Follow these instructions:

  1. Review the reservation details page to verify that your MileagePlus number is displayed correctly in the designated field.
  2. If there is an option to preview your reservation, use it to view the reservation as the airline will see it.
  3. Pay attention to any confirmation messages or alerts on the page that indicate a successful update.
  4. Watch for additional prompts related to your MileagePlus number or frequent flyer benefits, which may include information about available offers.

If you notice any errors with your MileagePlus number or other membership details during confirmation, take immediate action. Visit the United website or app and navigate to the "My Trips" section to edit or update your information directly on the reservation page. Alternatively, contact United's customer service for assistance.

By confirming the update, you ensure your MileagePlus number is correctly linked to your reservation, so you receive the benefits and rewards associated with your membership when you travel.

Step 5: Verifying the MileagePlus Number

Verifying your MileagePlus number is the final step to ensure your membership information is accurately recorded and associated with your reservation. Follow these steps:

  1. Visit the United Airlines website or app and navigate to the "My Trips" section.
  2. Locate the specific reservation you updated with your MileagePlus number.
  3. Click on the reservation to view the booking details.
  4. Scan the reservation summary or details page to find the section where your MileagePlus number is displayed. Ensure it matches the number you entered earlier.
  5. Double-check any loyalty program or frequent flyer information associated with your reservation for accuracy.
  6. If there are additional flight segments within your reservation, ensure your MileagePlus number is applied consistently for all flights.
  7. If you notice any discrepancies or errors, contact the airline's customer service immediately to rectify the issue before your flight.

Verifying your MileagePlus number ensures you will earn the appropriate miles for your flight and enjoy the associated benefits. It also provides peace of mind that your loyalty program information is correctly linked to your travel plans.

By thoroughly verifying your MileagePlus number, you can be confident that your membership is fully recognized and utilized during your travel experience.

Conclusion

You have learned how to add your MileagePlus number to a reservation. By completing this process, you have ensured your MileagePlus membership is linked to your upcoming flight, allowing you to earn miles and enjoy loyalty perks.

 

We walked through the steps: accessing the reservation, locating the MileagePlus number field, adding the number, confirming the update, and verifying the accuracy of your information.

 

Adding your MileagePlus number ensures you receive credit for your flights and access to benefits like free flights, cabin upgrades, or airport lounge access.

 

If you encounter issues, contact United's customer service team for assistance.

 

Now that you have added your MileagePlus number, enjoy your upcoming flight knowing you are earning miles and rewards.

 

Safe travels and happy mileage earning!