Last updated: September 8, 2026 · Baggage fees change often — confirm current details on United’s official baggage page before you fly.
Quick answer
United’s carry-on limit is 22 x 14 x 9 in, but domestic Basic Economy usually allows only a personal item (≤9 x 10 x 17 in) — no overhead carry-on. Checked bags on domestic routes are $45/$50 (first) and $55/$60 (second) depending on prepay vs airport. Transatlantic/Pacific first bag is free (except Basic Economy).
Carry-on & the Basic Economy catch
Standard fares include a carry-on (22 x 14 x 9 in) plus a personal item. Domestic Basic Economy tickets don’t include an overhead carry-on — just the under-seat personal item — unless you’re on a transoceanic or South America route.
Checked bag fees (domestic)
- 1st bag: $45 prepaid / $50 airport
- 2nd bag: $55 prepaid / $60 airport
Prepay online at least 24 hours ahead to save $5 per bag.
Weight, size & international
Overweight (51–70 lb) and oversize (up to 115 linear in) bags carry stacked surcharges on top of the base fee. On transatlantic and transpacific routes the first checked bag is included for most cabins (not Basic Economy).
Frequently asked questions
Does United allow a free carry-on?
On most fares yes, up to 22 x 14 x 9 in. But domestic Basic Economy usually allows a personal item only — no overhead carry-on (transoceanic and South America routes are exceptions).
How much are United checked bag fees?
On domestic routes the first checked bag is $45 prepaid ($50 at the airport) and the second is $55 prepaid ($60 at the airport). Prepaying online 24h ahead saves $5 per bag.
Is the first checked bag free on United international flights?
On transatlantic and transpacific routes the first checked bag is free for most seat classes (excluding Basic Economy).
What is United's personal item size?
Up to 9 x 10 x 17 inches, and it must fit under the seat in front of you.
How do I avoid United bag fees?
Prepay online, avoid Basic Economy if you need an overhead bag, or fly a route/cabin where the first bag is included.
Related resources
Delta baggage policyUnited baggage policyAmerican baggage policyCompare flights & book by phone
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