Just like most of the U.S. major airlines, United allows all passengers to bring two pieces of hand luggage: one carry-on bag and one personal item like a purse, small backpack, briefcase, or laptop.
The carry-on size limit is 22 x 14 x 9 inches.
But how strict is United about this carry-on size?
This post covers everything you need to know about United Airlines carry-on rules, including how strict they really are about enforcing the size limit.
Let’s break it down.
How Strict Is United Airlines With Carry-on Size Limits?
According to United’s website, unless you’re flying to South America, across the Atlantic, or the Pacific, most passengers (except Basic Economy) can bring one free carry-on bag with a size of 9″ x 14″ x 22″.
That includes handles, wheels, and straps so no cheating.
The good news? You can also bring a personal item (like a backpack, laptop bag, or small purse) that fits under the seat in front of you.
The ideal size for this is 9″ x 10″ x 17″. Both items are free of charge, as long as they meet the size requirements.
But here’s the catch: if your bag doesn’t fit in the overhead bin or under the seat, it’s adieu to your carry-on.
You’ll have to check it, and depending on your ticket type, you might face extra fees especially if it’s gate-checked.
Suggested: What is the Best Carry On Bag For United Airlines?
How Strict Is United Airlines in Real Life?
United is slightly strict about their carry-on size limits.
If your bag looks even a little too big, they’ll likely ask you to pop it into the luggage sizer at the gate.
But here’s a pro tip: the sizer itself is actually 23 x 15 x 10 inches for carry-ons and 18 x 11 x 9 inches for personal items.
That means there’s a tiny bit of wiggle room just don’t push your luck.
If you’re flying Basic Economy, though, beware.
You’re only allowed one personal item, and United is very strict about this.
Any additional bags will have to be checked, and you’ll likely pay extra for the privilege.
What Else Can You Bring Onboard?
Besides your carry-on and personal item, United lets you bring a few extra goodies for free:
- A jacket or umbrella
- A camera bag
- Food or items bought at the airport
- Assistive devices (like collapsible wheelchairs or medical equipment)
- FAA-approved child restraint system or safety seat
- Reading material, like books and magazines.
- A diaper bag or breast pump
- A pet carrier (though fees apply for in-cabin pets)
Liquids and Toiletries: The TSA 3-1-1 Rule
If you are planning to take any liquids and toiletries in your carry on, you will need to follow the TSA 3-1-1 Rule.
- Each container must be 3.4 ounces (100 milliliters) or less.
- All containers must fit in a single quart sized bag.
- Larger quantities can go in your liquids in checked baggage.
Checked Luggage: What You Need to Know
Even if you’re traveling carry-on only, it’s good to know United’s checked baggage rules, just in case.
Weight Limits by Class:
- United Economy: 50 pounds (23 kilograms)
- United Business/First/Polaris: 70 pounds (32 kilograms)
Oversized or Overweight Bags:
- United won’t accept bags over 115 inches (length + width + height) or 100 pounds (45 kilograms).
- Exceptions include musical instruments (up to 165 pounds) and assistive devices.
If your bag is oversized or overweight, expect to pay extra fees.
Final Thoughts: Stay Within the Limits
United Airlines is pretty serious about their carry-on size limits, especially for Basic Economy passengers. While there’s a bit of flexibility with the sizer, it’s always better to play it safe.
To avoid stress (and extra fees), double-check your bag’s dimensions before heading to the airport. Stick to the rules, and you’ll have a smooth, hassle-free travel experience.
I hope this helps
Happy travels
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First time flying with United, do they tend to be strict about carry-on size? My bag is just an inch or two over the 14-inch limit, so I’m a bit confused.
Hi, If it’s just an inch over, you should be totally fine, United usually doesn’t care over something that small.
I have 2 carry ons,1 small item bag Backpack type, and a Carry on Duffle bag type. Can you confirm that please?
Hi,your Backpack will be considered as a personal item and the Duffle will be considered as you main carry-on. You might need to pay for the duffle bag if your are flying Basic Economy.