United Airlines has dedicated a page for United Express on its website.
United Express Check-in
United Express baggage allowance
Carry-on: One carry-on item and one personal item, such as a laptop, are allowed per passenger. The carry-on item must be no bigger than 14in x 22in x 9in.
Checked: For flights within the US and Canada, there is a $25 charge for the first bag and $35 for the second. Bags must weigh less than 50lbs.
Excess: There is an excess fee for overweight and oversized bags. No bag, however, will be carried if it has linear dimensions greater than 115in, or weighs more than 100lbs. See United’s website for specific details and fees.
United Express legroom
Seat pitch: 31 inches.
Can be booked online.
Passenger change details
Changes can be made online to tickets for travel wholly in the US. These tickets are non-refundable so a $150 administrative fee is charged along with any difference between the new fare and the old.
One infant, less than two years old, may fly free on an adult’s lap on domestic flights. No child fares are available.
Senior fares may be available. Check with the airline before booking.
Dogs, cats and rabbits can travel in the cabin, as checked luggage or unaccompanied as cargo. The cost for traveling with pets in the cabin are $125 each way and there is a $250 charge for traveling with your pet as checked luggage on domestic flights.
Carrying musical instruments
An instrument can be carried on board as a carry-on but it must be smaller than 45in and fit under the seat in front of you or in the overhead storage bins. If your instrument is too large to be carried on board, it can be carried in the hold as checked luggage, provided that it is in a hard case, is smaller than 62in and weighs less than 50lbs. Alternatively, you may purchase a seat for your instrument if you don’t feel comfortable checking it or if it is larger than United accepts.
Soft drinks are free and alcoholic beverages are available for purchase on every flight. A la carte snacks are available for purchase on every flight over two hours and other snack boxes and meals are available for purchase on flights more than three hours.