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Southwest Airlines Baggage & Check-In Rules 2026: Complete Guide
Flying Southwest? Famous for 2 free checked bags and open seating, Southwest offers unique policies. This guide covers baggage allowances, the crucial 24-hour check-in rule, boarding positions, and how to maximize your experience.
Baggage Policy Overview
Southwest Airlines is famous for having the most generous baggage policy among major US airlines. With 2 free checked bags per passenger and no carry-on fees, Southwest offers exceptional value compared to other low-cost carriers.
Key insight: Southwest's 2 free checked bags policy applies to all passengers on all fares. This is the most generous policy among major US airlines and can save you hundreds of dollars compared to other carriers.
Southwest baggage policy at a glance (2026)
Carry-On Rules & Sizes
Main Carry-On Bag
- Maximum dimensions: 10 x 16 x 24 inches (25 x 40 x 61 cm)
- Maximum weight: Not specified (must be able to lift into overhead bin)
- Placement: Overhead compartment
- Quantity: 1 piece per passenger
- Fee: FREE
Personal Item
- Maximum dimensions: Must fit under the seat in front of you
- Includes: Purse, briefcase, laptop bag, backpack
- Placement: Under the seat
- Quantity: 1 piece per passenger
- Fee: FREE
Pro tip: Unlike most low-cost carriers, Southwest does not charge for carry-on bags. This is a significant benefit that sets Southwest apart from competitors like Spirit or Frontier.
Checked Baggage (2 Free Bags)
Southwest's most famous benefit is 2 free checked bags per passenger. This policy applies to all fares and is the most generous among major US airlines.
Free Baggage Allowance
- First bag: FREE (up to 50 lbs)
- Second bag: FREE (up to 50 lbs)
- Maximum weight per bag: 50 lbs (23 kg)
- Maximum dimensions: 62 linear inches (157 cm total)
Additional Bags
- Third bag and beyond: $75 per bag each way
- Maximum pieces: No specified limit (subject to space)
- Weight/size limits: Same as free bags
Companion Pass benefit: If a Companion Pass Member qualifies for free checked bags, the benefit applies to their Companion as well. This extends the generous policy to travel companions.
Open Seating & Boarding Positions
Southwest uses a unique open seating system with no assigned seats. Your boarding position determines when you board and your seat choice. Understanding this system is crucial for a good experience.
Boarding Groups
- Group A: Positions A1-A60 (first to board, best seat selection)
- Group B: Positions B1-B60 (second to board)
- Group C: Positions C1-C60 (last to board, limited seat selection)
How Boarding Positions Work
- Check-in timing: Exactly 24 hours before departure
- Earlier check-in: Better boarding position
- Boarding order: A1-60, then B1-60, then C1-60
- Seat selection: First-come, first-served within your group
Golden rule: Set a reminder to check in exactly 24 hours before your flight. This is crucial for securing a good boarding position. Early check-in = better position = better seat selection.
Check-In Rules & 24-Hour Rule
Southwest's check-in process is unique and timing-critical. Understanding the 24-hour rule is essential for securing a good boarding position.
Online Check-In
- Opens: Exactly 24 hours before departure Closes: 60 minutes before departure
- Methods: Southwest website, mobile app
- Importance: Determines boarding position
Airport Check-In
- Desks open: Varies by airport (typically 2 hours before)
- Baggage drop: Available for checked bags
- Boarding pass: Mobile or printed
Critical warning: If you don't check in before the deadline, you may be marked as a no-show and your seat could be given to another passenger. Always check in on time.
Extra Baggage Fees
While Southwest includes 2 free checked bags, additional bags and oversized/overweight items incur fees. Understanding these fees helps you plan accordingly.
Additional Bags
- Third bag: $75 each way
- Fourth bag and beyond: $75 each way
Overweight Bags
- 51-70 lbs: $100 fee
- Over 70 lbs: Not accepted
Oversized Bags
- 62-80 linear inches: $75 fee
- Over 80 linear inches: Not accepted
Money-saving tip: With 2 free checked bags, most travelers won't need to pay extra fees. If you need more than 2 bags, consider shipping items separately or upgrading to a carrier with more generous policies.
Frequently Asked Questions
What is Southwest hand baggage size 2026?
Southwest allows one carry-on bag (10 x 16 x 24 inches, max 10 kg) plus one personal item that fits under the seat. This generous policy applies to all passengers on all fares.
How many free checked bags does Southwest include?
Southwest includes 2 free checked bags per passenger—the most generous policy among major US airlines. Each bag must not exceed 50 lbs (23 kg) and 62 linear inches (157 cm).
When does Southwest online check-in open?
Southwest online check-in opens exactly 24 hours before departure. This timing is crucial for securing a good boarding position, which determines your seat choice due to Southwest's open seating policy.
What is Southwest open seating?
Southwest uses open seating with no assigned seats. Your boarding position (A1-60, B1-60, C1-60) determines when you board and your seat choice. Earlier check-in = better position = better seat selection.
Does Southwest charge for carry-on bags?
No, Southwest does not charge for carry-on bags. One carry-on bag plus one personal item are included free with every ticket. This is another benefit that sets Southwest apart from other low-cost carriers.
What is Southwest overweight baggage fee?
Southwest charges $100 for overweight bags (51-70 lbs). Bags over 70 lbs are not accepted. Oversized bags (62-80 linear inches) incur a $75 fee. Bags over 80 linear inches are not accepted.
Compare with Other Low-Cost Airlines
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