1. United Airlines - Flight Check In

    https://www.united.com/en/us/checkin

    Check in for your United or United Express-operated flight, depending on where you are in your travel experience.

  2. Contact Reservations | United Airlines

    https://www.united.com/en/us/fly/help/contact-reservations.html

    Find out how to modify your trip or manage your reservation online or by phone. Get contact information for different languages and regions, and chat with us 24 hours a day.

  3. How to Contact United Airlines Customer Service - NerdWallet

    https://www.nerdwallet.com/article/travel/the-busy-persons-guide-to-united-airlines-customer-service?trk_elementPosition=2&trk_subLocation=tiles

    This web page does not provide information on how to access your existing reservations with United Airlines. It is a guide to contact United Airlines customer service by phone, email, chat or social media for various reasons.

  4. How to change or cancel a United Airlines flight

    https://thepointsguy.com/airline/change-cancel-united-airlines-flight/

    To do this, head to United's website and do the following: Log in to your United account. Click the "My trips" button on the homepage. Click the "Manage trip" button to the right of the trip you'd like to change or cancel. Click the "Change flight or Cancel flight" button at the top of the screen.

  5. How To Add Your MileagePlus Number To An Existing Reservation

    https://www.touristsecrets.com/travel-guide/how-to-add-your-mileageplus-number-to-an-existing-reservation/

    By adding your MileagePlus number to your existing reservation, you can earn valuable miles for future travel, enjoy priority boarding and upgrades, access exclusive lounges, and more. It’s a convenient and rewarding process that enhances your travel experience with United Airlines.