Comparing the Luggage Rules of Major U.S. Airlines

Bag policies can vary by airline.

If you’ve ever tried to book a flight within the United States, you know how confusing baggage rules can be. Each airline has its own policies for carry-ons, checked luggage, fees, and weight limits. To help you plan your next trip, we’ve broken down the essentials so you can pack smart and avoid surprise charges at the airport.

Carry-On Allowances

• Southwest Airlines

  • Free carry-on bag (22” x 14” x 9”) plus one personal item.

  • Known for being traveler-friendly. Both are always included in the ticket price.

• American Airlines, Delta, United

  • Free carry-on (similar size to Southwest) plus one personal item.

  • Basic Economy fares: United does not allow a full-size carry-on; only a personal item.

• JetBlue

  • Free carry-on and personal item for most fares.

  • Basic Blue fare includes only a personal item.

• Alaska Airlines

  • Carry-on and personal item always included.

• Frontier & Spirit

  • Personal item is free, but carry-on costs extra.

  • Carry-on fees often range $30–$60 each way, depending on route and booking time.

Airlines usually charge for checked bags on domestic flights.

Checked Bag Policies

• Southwest Airlines

  • Best in the business: two checked bags free (50 lbs, 62 linear inches each).

• American, Delta, United

  • Checked bags usually $30 for the first, $40 for the second.

  • Weight limit: 50 lbs for economy, 70 lbs for premium classes.

• JetBlue

  • First checked bag is $35, second $45.

  • Some higher-tier fares include a free checked bag.

• Alaska Airlines

  • First checked bag: $30, second $40.

  • Discounts available for frequent flyers and credit card holders.

• Frontier & Spirit

  • Checked bags are not included.

  • Fees can range from $30 to over $70 depending on when you pay (cheapest online, most expensive at the gate).

Understanding the luggage rules can make travel less stressful.

Weight & Oversize Rules

• Standard checked bag weight: 50 lbs for most airlines (70 lbs for business/first class).

• Oversize fees apply for bags over 62 linear inches (L + W + H).

• Overweight fees can be steep, up to $100–200 per bag.

Traveler Tips to Save Money

1. Always check your fare class. Basic Economy fares may restrict carry-ons or checked luggage.

2. Pay online in advance. Bag fees at the airport are always higher.

3. Weigh your bags at home. A cheap luggage scale can save you hundreds in overweight fees.

4. Consider airline credit cards. Many offer free checked bags as a perk.

5. If you fly Southwest, take advantage. Two free checked bags can save you $120+ roundtrip compared to other carriers.

Southwest and United planes landing.

Bottom Line

• Best for luggage: Southwest (hands down as they allow two checked bags free).

• Worst for luggage: Frontier & Spirit (almost everything costs extra).

• Middle ground: American, Delta, United, Alaska, JetBlue (carry-on included, but checked bags cost $30+).

When planning your trip, don’t just compare ticket prices, factor in baggage fees. A “cheap” fare can quickly turn into the most expensive once you add luggage.

Always check with airlines BEFORE booking for latest bag policies and prices.