United Airlines Carry-On Size & Rules

Quick answer: Carry-on bag needs to be stowed in the overhead compartment, allowing a measurement of: 22 × 14 × 9 in (56 × 35 × 23 cm).

Personal items which are stowed under the seat have a limit of: 17 × 10 × 9 in (43 × 25 × 22 cm). Most fares include one carry-on and one personal item for free, but Basic Economy on many U.S. routes only allows one personal item.

United Airlines Carry-on Size Rules

• For standard carry-ons, they must be able to fit in the overhead compartment: 22″ L × 14″ W × 9″ H (inches), counting wheels and handles. If the size exceeds the frame, it’ll be checked (fees may apply depending on your fare).
• Personal items must slide fully under the seat in front with a measurement of: 17″ L × 10″ W × 9″ H (small backpack, laptop bag, or purse).
• For United Airlines, as long as you can lift it into the compartment safely, there isn't a specific weight limit. (Check international fare rules if you’re worried.)
• The airline’s maximum carry-on size is 22×14×9 inches. United Airlines measures the outside of the suitcase (wheels/handles count). Your personal item cannot exceed 17×10×9 inches (small backpack, tote bag, or laptop bag). There’s no published domestic carry-on weight limit; you just need to lift it safely to the overhead bin.

Restrictions on United Airlines Carry-on Size

• For U.S. domestic & most short-distance flights, basic economy allows no full-size carry-ons. Only allowing personal items with a size of 17×10×9 in. If you were to bring a larger bag to the gate, it would be checked with fees.
• There are exceptions where a full-size carry-on luggage size is allowed in basic economy. These routes include: Canada, South America, trans-Atlantic, and trans-Pacific itineraries.
• Another exception is for MileagePlus Premier and Star Alliance Gold members or primary holders of eligible United credit cards, passengers can bring a full-size carry-on even for basic economy.

Tip: If you booked basic economy by mistake but need a rollaboard, upgrade to Standard Economy/Main Cabin... It’s often cheaper than paying gate-check fees.

United Airlines Personal Item vs. Carry-on

• Personal item for United Airlines: 17×10×9 in; must go under the seat in front of you.
• Carry-on baggage for United Airlines: 22×14×9 in; goes in the overhead compartment.
• Items that typically don’t count toward the 1+1 limit: coat/jacket, umbrella, and small airport purchases. (Small purses usually do count as personal items)

International Carry-on Size on United

• On most United international routes, the carry-on size is the same 22×14×9 in and is included with Main Cabin fares.
• Basic economy international (e.g., trans-Atlantic/trans-Pacific) does allow a full-size carry-on, unlike U.S. domestic basic economy.
• Some partnering airlines may have stricter carry-on weight or size rules. Always double-check your itinerary if a partner airline operates a segment of your travels.

United Express & Regional Jets Carry-ons

Flying a United Express regional jet? Overhead compartments are smaller.

Even with an eligible fare, standard suitcases are often checked at the aircraft door and might be kept safe with the aircrew until lIf you do have any important personal belongings, keep medications, electronics, and valuables in your personal bag.

United Airlines Carry-on Size: How Do You Measure Them?

Credit: from Buymode

• Measure the length × width × height at the largest points, including wheels/handles. 
• If your bag passes the 22×14×9 limit, it may not fit in the compartment. If you do exceed, there might be a fee, especially for basic economy tickets.
• With soft bags, it is easier to compress and slide into different spaces, easier than hard cases.

United Airlines Carry-on Size: Traveling With Kids (Strollers, Car Seats, Diaper Bag)

• In addition to your carry-on baggage, families can bring a diaper bag, formula milk, and a child safety seat (if your child is too young).
• If you carry a small and collapsible stroller, it can normally fit in the cabin. Otherwise, you might need to check it in. However, they’re check-ins are free (in most cases). It is best to double-check with the booking agency or the airline beforehand.

United Airlines Carry-on Size: Special Items

• Musical instruments: They can be a carry-on if they fit in the overhead compartment or under-seat. With larger instruments, you may need a seat or check it in.
• Sports equipment: With sporting equipment, they are usually checked due to their size. However, it may change with different flights or airlines. This is something to take into consideration when you are booking your flight.

Comparison Table: United Carry-on Rules by Fare/Route