Southwest Airlines vs United Airlines Baggage Compared (2026)
Southwest offers 2 free checked bags and larger 24×16×10 in carry-ons, while United charges per bag and restricts Basic Economy. Review 2026 rules.
The Decision Verdict (40–60 Words)
Southwest Airlines and United Airlines differ fundamentally on baggage policy: Southwest includes two free checked bags (up to 50 lbs each) and allows a larger carry-on (24 × 16 × 10 in), whereas United charges $35–$40 per checked bag and restricts domestic Basic Economy passengers to a personal item only.
Detailed Comparison Table
| Comparison Dimension | Southwest Airlines Southwest | United Airlines United |
|---|---|---|
| Free Checked Bags Included Differs by Rule | 2 Free Checked Bags (up to 50 lbs each) Source (Southwest) | 0 Free Bags (fees start at $35 USD) Source (United) |
| Carry-On Dimensions Limit Differs by Rule | 24 × 16 × 10 in (61 × 41 × 25 cm) Source (Southwest) | 22 × 14 × 9 in (56 × 35 × 23 cm) Source (United) |
*Airline baggage fees and dimensional allowances are verified snapshots as of 2026-09-03. Fees vary dynamically by route, fare class, and booking window. Always check with your operating carrier before departure.
Where Rules Are 100% Identical
To prevent false assumptions, the following standards are shared without difference between all compared parties:
- Checked bag weight limit (50 lbs / 23 kg before overweight fee)
- Personal item must fit under the seat in front of you
Key Rule Distinctions Explained
What is the rule for free checked bags included?
Southwest includes two free checked bags with every ticket. United charges $35 prepaid for the first checked bag and $45 for the second bag on standard domestic economy tickets.
What is the rule for carry-on dimensions limit?
Southwest permits larger carry-on bags (up to 24 inches long) than United and legacy carriers, accommodating larger duffel bags and rollaboards.
Traveler Recommendation & Decision Summary
Southwest offers significant cost savings when traveling with multiple bags or bulky items, saving up to $160 round-trip in baggage fees compared to United.
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Frequently Asked Questions
How many bags fly free on Southwest compared to United?
Southwest permits two checked bags up to 50 pounds each completely free of charge for all ticketed passengers. On United, checking two standard bags costs $80 each way ($160 round-trip) on domestic flights unless you hold elite status or a co-branded card.
Official Primary Sources & Citations
- Southwest Baggage Policy Verified: 2026-09-03
- United Baggage Calculator Verified: 2026-09-03