Southwest Airlines Carry-On Size 2026: Complete Rules & Limits

Southwest Airlines Carry-On Size (2026 Complete Guide)

Last Updated: March 30, 2026

Southwest Airlines has the most generous baggage policy among major U.S. carriers, offering both free carry-ons and two free checked bags. Understanding Southwest’s carry-on size limits helps you maximize your packing space while taking advantage of their industry-leading “Bags Fly Free” policy. This comprehensive guide covers Southwest’s carry-on dimensions, weight limits, enforcement practices, and strategies to pack efficiently for Southwest flights.

Quick Answer: Southwest Carry-On Size

Southwest carry-on maximum size: 10″ x 16″ x 24″ (25 x 41 x 61 cm)

Key Southwest baggage benefits:

✅ Carry-on bag: FREE (no charge)
✅ Personal item: FREE (18.5″ x 8.5″ x 13.5″)
✅ First checked bag: FREE
✅ Second checked bag: FREE
✅ No weight limit on carry-ons
✅ No change fees

Bottom line: Southwest allows larger carry-ons than most airlines (24″ length vs. standard 22″) with no weight restrictions, making it ideal for travelers who prefer to carry on rather than check bags.

Southwest Carry-On Dimensions & Limits

Maximum Carry-On Size

Official Southwest carry-on limits:

Length: 24 inches (61 cm)
Width: 16 inches (41 cm)
Height: 10 inches (25 cm)
Total linear inches: 50 (L + W + H)
Weight limit: None (no weight restriction)

Important notes:

Dimensions include wheels, handles, and any protruding parts
Must fit in overhead bin or under seat
Soft-sided bags may have slight flexibility
Hard-shell cases must meet exact dimensions

Personal Item Size

Maximum personal item dimensions:

Length: 18.5 inches (47 cm)
Width: 13.5 inches (34 cm)
Height: 8.5 inches (22 cm)
Must fit: Under the seat in front of you

Acceptable personal items:

Backpacks (small to medium)
Laptop bags
Purses and handbags
Briefcases
Diaper bags
Camera bags (small)

Southwest’s “Bags Fly Free” Policy

What Makes Southwest Different

Southwest includes:

Carry-on bag: FREE (standard overhead bin bag)
Personal item: FREE (under-seat bag)
First checked bag: FREE (50 lbs, 62 linear inches)
Second checked bag: FREE (50 lbs, 62 linear inches)
Third+ checked bags: $75 each

Value calculation:

Competitor checked bag fees: $30-40 per bag each way
Southwest savings: $60-80 per round-trip with one checked bag
Family of 4 with 2 bags each: $240-320 saved per trip

Why Southwest offers free bags:

No assigned seating (faster boarding)
Fewer gate delays (less carry-on congestion)
Customer loyalty driver
Lower operational costs (efficient turnarounds)

How Southwest Enforces Carry-On Size

Enforcement Levels

MODERATE enforcement:

Gate agents check obvious oversized bags
Sizers available at gates (not always used)
Full flights trigger stricter checking
Rarely measures bags that appear compliant

When Southwest measures carry-ons:

✓ Bag looks significantly oversized
✓ Flight is completely full
✓ Multiple passengers with large bags
✓ Someone complains about bin space

When Southwest doesn’t check:

✗ Bag appears close to standard size
✗ Flight has available overhead space
✗ You board early (A boarding group)
✗ You have elite status or Southwest credit card

What Happens If Your Bag Is Oversized

Southwest’s gate check process:

Agent identifies oversized carry-on
You’re asked to gate-check the bag (FREE)
Bag is checked to final destination (no fees)
Retrieve at baggage claim (not gate)

Southwest advantages:

✅ Gate checking is FREE (unlike Spirit/Frontier)
✅ No penalty fees
✅ Bag goes to final destination
✅ Blue bag tag (easy identification)
✅ No risk to other allowances

Packing Strategies for Southwest Flights

Maximize Your 2 Free Checked Bags

Since Southwest offers 2 free checked bags, consider:

Pack checked bags with:

Heavy items (books, shoes, toiletries over 3.4oz)
Bulky clothing (coats, boots, sweaters)
Liquids and gels over TSA limits
Items you don’t need during flight
Valuable items in personal item (not checked)

Keep in carry-on:

Essentials (medications, documents)
Electronics (laptop, tablet, phone)
One change of clothes (in case bag is delayed)
Entertainment for flight
Valuable items (jewelry, expensive gear)

Strategy benefit: Use checked bags for weight/bulk, save carry-on space for valuable/essential items.

Choosing the Right Carry-On for Southwest

Optimal Southwest carry-on dimensions:

Standard size: 22″ x 14″ x 9″ (fits all airlines)
Southwest maximum: 24″ x 16″ x 10″ (Southwest-specific)

Should you buy Southwest-sized luggage?

YES, if:
✓ You fly Southwest frequently (12+ times/year)
✓ You prefer carry-on only travel
✓ You want maximum packing space
✓ You don’t fly other airlines often

NO, if:
✗ You fly multiple carriers regularly
✗ You already have 22″ x 14″ x 9″ bag
✗ You use Southwest’s free checked bags
✗ You need universal airline compatibility

See our Southwest-specific luggage recommendations →

Southwest Boarding Groups & Carry-On Strategy

How Boarding Order Affects Overhead Space

Southwest’s open seating boarding:

Group A (1-60): Board first, plenty of overhead space
Group B (1-60): Board second, some overhead space
Group C (1-60): Board last, limited overhead space

Boarding strategies:

A1-A15 (EarlyBird or Business Select):

First to board
Guaranteed overhead space
Can bring maximum-sized carry-on
No risk of gate checking

A16-A60:

Still early boarding
Good overhead space availability
Standard carry-on works fine

B1-B60:

Middle boarding group
Overhead space becoming scarce
Consider smaller carry-on or use checked bags
May need to place bag several rows away

C1-C60:

Last to board
Limited overhead space
High risk of gate checking (though free)
Best strategy: Use free checked bags

EarlyBird Check-In ($15-25)

What you get:

Automatic check-in 36 hours before departure
Usually A or early B boarding position
Better overhead bin access
Worth it for carry-on only travel

When EarlyBird is worth it:
✓ Flying carry-on only (avoid gate check)
✓ Want choice seating
✓ Traveling with others (board together)
✓ Peak travel times (full flights)

When to skip EarlyBird:
✗ Using free checked bags anyway
✗ Don’t care about seat choice
✗ Off-peak flights (empty overhead bins)

Southwest Carry-On vs. Other Airlines

Size Comparison

Airline	Length	Width	Height	Linear Inches
Southwest	24″	16″	10″	50″
Delta	22″	14″	9″	45″
United	22″	14″	9″	45″
American	22″	14″	9″	45″
JetBlue	22″	14″	9″	45″
Alaska	22″	14″	9″	45″

Southwest advantage: 2 extra inches in length + 2 inches in width = ~20% more packing space than competitors.

Policy Comparison

Feature	Southwest	Delta/United/American	Spirit/Frontier
Carry-on fee	FREE	FREE	$30-65
Weight limit	None	None	40-50 lbs
First checked bag	FREE	$30-40	$30-55
Second checked bag	FREE	$40-50	$45-60
Gate check fee	FREE	FREE	$60-65

Bottom line: Southwest offers the most generous baggage policy of any major U.S. carrier.

Special Items & Exceptions

Items That Don’t Count Toward Allowance

Always allowed (in addition to carry-on + personal item):

Assistive devices (wheelchairs, crutches, canes, walkers)
Strollers (gate-checked free)
Car seats (can be gate-checked or brought onboard)
Breast pumps and accessories
Diaper bags
Umbrellas (collapsible)
Coats and jackets
Reading material (books, magazines)
Food and beverages (purchased after security)

Sports Equipment

Free checked items (count as regular bag):

Golf bags (1 bag per person)
Skis and snowboards (1 item per person)
Fishing equipment
Hockey equipment
Bicycle (must be in bike box)

Southwest sports equipment policy:

First 2 bags FREE (including sports equipment)
Must meet 50 lb weight limit
Must meet 62 linear inch size limit
Oversized/overweight fees apply if exceeded

Complete Southwest baggage fee breakdown →

Musical Instruments

Small instruments (violin, flute):

Can be carry-on if fits in overhead bin
Or under seat as personal item
FREE

Medium instruments (guitar):

Can purchase seat for instrument
Or gate-check for FREE (risk of damage)
Hard case strongly recommended

Large instruments (cello):

Must purchase seat (full fare)
Notify Southwest in advance
Seat must be aisle or window (not middle)

Tips for Flying Southwest with Carry-Ons

Pack Smart for Southwest

Take advantage of free checked bags:

Check heavy/bulky items
Carry on valuables and essentials only
Avoid overweight carry-on struggle
No risk of lost valuables (carry them on)

Use both allowances strategically:

Checked bag 1: Clothing and toiletries
Checked bag 2: Shoes, accessories, bulky items
Carry-on: Electronics, medications, one change of clothes
Personal item: Travel documents, entertainment, snacks

Southwest-Specific Strategies

Family boarding (after A group):

Available with children 6 and under
Board between A and B groups
Good overhead space still available
Great for families with young kids

Companion Pass holders:

Your companion gets same boarding position
Both board together
Share overhead bin space
Coordinate luggage distribution

Rapid Rewards members:

A-List: Priority boarding after A1-15
A-List Preferred: After EarlyBird, before other A-List
Better overhead bin access
Worth earning status for frequent flyers

TSA PreCheck & Southwest

TSA PreCheck benefits:

Faster security screening
Keep shoes, belt, light jacket on
Keep laptop and liquids in bag
Available at most Southwest airports
$78 for 5 years (worth it if fly 4+ times/year)

Southwest PreCheck integration:

Add Known Traveler Number (KTN) to profile
Automatically appears on boarding pass
Must be added before check-in for each trip

Frequently Asked Questions

Does Southwest have a weight limit for carry-ons?

No, Southwest Airlines has no weight limit for carry-on bags. You can bring a carry-on up to 10″ x 16″ x 24″ regardless of weight, as long as you can lift it into the overhead bin yourself. However, gate agents may require you to check very heavy bags if they determine it’s a safety concern or if you’re struggling to lift it.

This makes Southwest ideal for travelers packing books, electronics, or other dense items in their carry-on.

What size personal item can I bring on Southwest?

Southwest allows personal items up to 18.5″ x 8.5″ x 13.5″ inches. Your personal item must fit completely under the seat in front of you. Acceptable personal items include backpacks, laptop bags, purses, briefcases, and small duffel bags.

The personal item allowance is in addition to your carry-on bag, and both are free on Southwest flights.

Is Southwest’s carry-on size bigger than other airlines?

Yes, Southwest allows larger carry-ons than most major airlines. Southwest’s maximum is 10″ x 16″ x 24″ (50 linear inches), while Delta, United, American, and Alaska allow 9″ x 14″ x 22″ (45 linear inches). This gives you approximately 20% more packing space with Southwest.

However, if you fly multiple airlines, it’s safer to stick with the standard 22″ x 14″ x 9″ size to ensure compatibility everywhere.

Does Southwest charge for carry-on bags?

No, Southwest never charges for carry-on bags. Both your standard carry-on (10″ x 16″ x 24″) and personal item (18.5″ x 8.5″ x 13.5″) are completely free on all Southwest flights, including Wanna Get Away (basic economy) fares.

This is part of Southwest’s industry-leading “Bags Fly Free” policy that also includes two free checked bags per passenger.

Can I gate-check my carry-on for free on Southwest?

Yes, gate-checking is always free on Southwest Airlines. If overhead bins are full or your bag is slightly oversized, Southwest will gate-check it to your final destination at no charge. You’ll receive a blue bag tag and retrieve your bag at baggage claim (not the gate).

This is a significant advantage over budget carriers like Spirit and Frontier, which charge $60-65 for gate-checked carry-ons.

What happens if my Southwest carry-on is too big?

If your carry-on exceeds 10″ x 16″ x 24″, Southwest gate agents will ask you to check it. The good news: checking is FREE on Southwest (your first two bags are always free). Your bag will be checked to your final destination with a blue bag tag, and you’ll retrieve it at baggage claim.

There are no penalty fees or charges for oversized carry-ons on Southwest, unlike budget airlines.

How strict is Southwest about carry-on size?

Southwest has moderate enforcement of carry-on size limits. They’re stricter than legacy carriers but more lenient than budget airlines. Full flights trigger more checking, especially for obviously oversized bags. If your bag appears close to compliant, you’ll usually be fine.

Early boarding groups (A1-A60) rarely face enforcement since overhead space is plentiful. C group passengers on full flights are most likely to have bags checked (though it’s free).

Can I bring a full-size suitcase as a carry-on on Southwest?

It depends on the suitcase dimensions. Standard 22″ carry-on suitcases fit Southwest’s limits, but full-size 26″-28″ checked luggage suitcases are too large. Southwest’s maximum is 10″ x 16″ x 24″ including wheels and handles.

However, since Southwest offers two free checked bags, there’s little advantage to forcing a large suitcase into the cabin. Check it for free and enjoy a more comfortable flight.

Does Southwest allow 2 carry-on bags?

Southwest allows one carry-on bag (10″ x 16″ x 24″) plus one personal item (18.5″ x 8.5″ x 13.5″). You cannot bring two full-sized carry-ons. However, you can also bring assistive devices, strollers, umbrellas, and coats without counting them toward your allowance.

With Southwest’s two free checked bags, most travelers don’t need multiple carry-ons.

What’s the best luggage size for Southwest flights?

For Southwest-only travelers, a 24″ x 16″ x 10″ bag maximizes your carry-on allowance. However, the standard 22″ x 14″ x 9″ size works perfectly on Southwest AND all other airlines, making it more versatile if you fly multiple carriers.

Given Southwest’s two free checked bags, consider using a standard-sized carry-on for essentials and checking larger bags for free.

See our Southwest-specific luggage recommendations →

Can I bring a backpack and a carry-on on Southwest?

Yes, you can bring one carry-on bag (up to 10″ x 16″ x 24″) plus one personal item backpack (up to 18.5″ x 8.5″ x 13.5″). Your backpack must fit under the seat in front of you. Both items are free on all Southwest flights.

Many travelers use a small to medium backpack as their personal item and a rolling carry-on bag for clothes and larger items.

Are liquids allowed in Southwest carry-ons?

Yes, liquids are allowed in Southwest carry-ons following TSA 3-1-1 rules: containers must be 3.4 oz (100ml) or less, all containers must fit in one quart-sized clear plastic bag, and you’re limited to one bag per passenger. Larger liquid containers must go in checked bags.

Since Southwest offers two free checked bags, consider packing full-sized toiletries in checked luggage rather than buying travel sizes.

Does Southwest measure carry-on weight?

No, Southwest Airlines does not weigh or measure carry-on bags under normal circumstances. There’s no official weight limit for carry-ons. However, you must be able to lift your bag into the overhead bin unassisted. If you’re struggling or a gate agent determines your bag poses a safety risk, they may require you to check it (for free).

Can I bring food in my Southwest carry-on?

Yes, you can bring solid foods in your Southwest carry-on without restrictions. Liquid or gel foods (yogurt, peanut butter, dips) must follow TSA 3-1-1 rules (3.4 oz containers). Solid foods like sandwiches, pizza, fruit, snacks, and baked goods are all allowed.

Southwest doesn’t offer many meal options on flights, so bringing your own food is common and encouraged.

What if I have a connecting flight on a different airline?

If you’re connecting from Southwest to another airline, your carry-on must meet the more restrictive airline’s limits. Most other U.S. carriers allow 22″ x 14″ x 9″ (smaller than Southwest’s 24″ x 16″ x 10″). If you have a Southwest-maximum bag, you may be required to check it at the connecting airport.

Always pack to the smallest airline’s limits when connecting between carriers.

Summary: Southwest Carry-On Advantages

What makes Southwest different:

Larger carry-ons allowed (24″ vs. standard 22″)
No weight restrictions (unlike European/Asian carriers)
Free gate checking (no $60-65 penalty fees)
Two free checked bags (reduces carry-on need)
Generous personal item size (18.5″ x 8.5″ x 13.5″)
No change fees (flexibility for travel plans)

Best practices for Southwest:

Use standard 22″ x 14″ x 9″ if flying multiple airlines
Take advantage of two free checked bags
Buy EarlyBird Check-In ($15-25) for guaranteed overhead space
Board early (A group) for best bin access
Pack valuables in carry-on, bulk items in checked bags

Bottom line: Southwest’s generous baggage policy (free carry-on + 2 free checked bags + larger size allowance) makes it the most luggage-friendly airline in the United States.

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Last Updated: March 30, 2026

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