You can bring one carry-on bag and one personal item for free on most domestic and international flights.
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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.
International flights allow one, and often two, pieces of checked luggage per passenger. International luggage allowance is often influenced by whether the flight is intracontinental (within the same continent) or intercontinental (across the ocean or spanning different continents).
United Airlines Carry-on Size Restrictions. Carry-on luggage for a United Airlines flight must be no larger than 9 inches X 14 inches X 22 inches (22 cm X 35 cm X 56 cm). When measuring, remember these dimensions include the luggage's wheels and handles.
Many airlines will allow you to bring a carry-on bag and personal item for free. However, some airlines may only allow a personal item that fits under your seat for free. Anything larger (e.g. a bag that's too big to fit under the seat but can fit into the overhead compartment) may require extra payment.
If you purchased a basic economy ticket for United, it should be clearly indicated on your ticket or confirmation email. Look for the fare code - basic economy code for United is N. Are United Airlines' Mileage Plus points valuable enough to pay $50-100 extra for a long trip?
Like most other airlines, United gives its guests assigned seating on its flights. The majority of customers can select from a variety of seats for free, but there are also options for preferred seating and even upgrades for those who are willing to pay.
A carry on bag is your larger, primary bag, which you'll stow in the overhead bin. A backpack can be your carry on if it meets your airline's carry on size limits. A personal item is a smaller, secondary bag, which you'll stow under the seat in front of you.
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.
If your flight ticket is marked with the code “2 PC”, you may take two pieces of baggage, each weighing a maximum of 23 kg. If your flight ticket is marked with the code “3 PC”, you may take three pieces of baggage, each weighing a maximum of 23 kg.
That depends if you have several kg overweight and are asking for the price per kg or if you really just only have one single kg extra. For a singe kg above the limit you most probably will not get charged, especially not on a full service airline. There is usually a tolerance in the range of 2–3kg, sometimes up to 5.