Find out how much it costs to check your bags with United and what size and weight limits apply. Learn about common items, bag check process, bag tracking and more.

You can choose a seat or change your seat assignment for most United- and United Express®-operated flights on united.com, on the United app or through your travel agent. If no seat assignments are available, you can check back closer to departure to see whether seats have become available.

United Airlines charges fees for everything from baggage to flight changes to in-cabin pets. Here's what you can expect to pay in addition to your fare.

United charges varying fees for checked bags based on route, class of service, and frequent flyer status, with additional charges for overweight and oversized luggage. First checked bag fees typically start at $35, with higher fees for subsequent bags.

United Airlines' checked bag fees for flights within North America, Central America and the Caribbean are pretty straightforward. In most cases, if you prepay for your bags at least 24 hours before departure, you'll receive $5 off each of the first two checked bags.

Basic Economy is a ticket option that saves you on ticket price but has some restrictions on bags, seats and changes. Learn about the rules, fees and benefits of Basic Economy and how to add more flexibility to your trip.