United Airlines' (UA) standard checked baggage / hold luggage fees for U S domestic flights: First bag: $35.00 USD. Second bag: $45.00 USD. Third and any additional: $150.00 USD per bag.
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Two free checked bags when traveling within the continental U.S. or to Alaska, Hawaii, Canada, Mexico, the Caribbean and Central America. Three free checked bags when traveling between the U.S. and South America, Asia, Australia, New Zealand, Europe, the Middle East and Africa.
It's nearly always cheaper to book extra hold luggage in advance rather than paying excess baggage fees at the airport. Airlines know that keeping within weight/size limits is not always possible, so they encourage you to plan ahead by selling extra weight online.
65 GBP / 75 EUR / 100 USD / 100 CAD per overweight bag and one-way journey. If you are leaving from a country that uses a different local currency, the GBP amount will be converted to the local currency.
Keep in mind that upgrading to Economy Plus will only net you more legroom, guaranteed in-seat power access and a seat closer to the front of the plane; it will not get you an additional baggage allowance.
United Airlines (UA) will charge the following for U S domestic flights for bags that are greater than the standard 50 pounds or 23 kilograms: 51 to 70 pounds or 24 to 32 kilograms: $100.00 USD to $200 USD extra per bag. 71 to 100 pounds or 33 to 46 kilograms: $400.00 USD extra per bag.
Many airlines let you check one bag for free on international flights booked in the main cabin, although their policies vary widely. For example, American Airlines offers a first checked bag for free on transatlantic and transpacific flights not booked in basic economy.