Overweight luggage fees start at $25 to $50 for a single bag and climb steeply from there

Most U.S. airlines charge a fee when a checked bag exceeds their weight limit, which is usually 50 pounds. The first overweight bag typically costs $25 to $50, depending on the airline. A second overweight bag costs more — often $100 or higher. Some airlines charge by how much the bag exceeds the limit: if your bag is 51 to 70 pounds, you pay one fee; if it's 71 to 100 pounds, you pay a higher fee. A few airlines charge a flat rate regardless of how far over the limit you go.

The exact amount varies by airline and changes periodically. Budget carriers like Spirit and Frontier tend to charge more aggressively than legacy carriers like Delta or United. Some airlines waive overweight fees for elite frequent flyer members or passengers in premium cabin classes. International flights sometimes have different thresholds and fees than domestic ones on the same airline.

Key Takeaways

  • Most airlines set a 50-pound limit for checked bags and charge $25 to $50 for the first bag that exceeds it.
  • A second overweight bag usually costs $75 to $150, making it expensive to check multiple heavy bags.
  • Some airlines charge by weight tier (51–70 pounds versus 71–100 pounds), while others charge one flat fee for any overage.
  • Budget airlines charge more for overweight bags than full-service carriers, and elite frequent flyer members often get waivers.
  • Checking your airline's specific policy before packing saves you from surprise fees at the airport.

How airlines define and measure overweight luggage

The standard weight limit for a checked bag on most U.S. airlines is 50 pounds. This applies to both domestic and international flights, though some international carriers use kilograms (23 kilograms is roughly 50 pounds). Airlines weigh bags at the ticket counter using a scale, and the weight shown on that scale is what determines whether you pay a fee.

A few airlines set lower limits. Some regional carriers or budget airlines may cap checked bags at 40 pounds. Conversely, some airlines allow 70 pounds on certain routes or for certain passengers. The weight limit is separate from the size limit — a bag can be within the size allowance but still trigger a fee if it's too heavy.

First and second overweight bag fees

The first overweight checked bag typically costs $25 to $50. Delta, United, and American Airlines generally charge around $25 to $35 for the first overweight bag on domestic flights. Southwest does not charge for overweight bags at all, which is one of its distinguishing policies. Spirit and Frontier charge $45 to $60 for the first overweight bag.

A second overweight bag costs significantly more — usually $75 to $150. Some airlines do not allow a second overweight bag and will refuse to check it. A third overweight bag is rarely permitted and may result in the airline refusing to transport the luggage or charging an even higher fee. If you have multiple heavy bags, it is almost always cheaper to ship items separately or buy additional luggage allowance before your trip.

Weight tier pricing and extreme overages

Some airlines use tiered pricing based on how far over the limit your bag is. For example, American Airlines charges one price if your bag is 51 to 70 pounds and a higher price if it's 71 to 100 pounds. United uses a similar system. This means a 51-pound bag and a 70-pound bag cost the same, but jumping to 71 pounds triggers a higher fee.

Bags over 100 pounds are typically refused by most airlines, even with payment. At that point, the airline will tell you the bag cannot be transported as checked luggage and you must make other arrangements. Some airlines allow bags up to 100 pounds but charge a premium fee (sometimes $100 or more) for the extreme overage. Always check your airline's policy if you know your bag will be very heavy.

How budget airlines charge differently

Budget carriers like Spirit, Frontier, and Allegiant have more aggressive overweight policies than traditional airlines. Spirit charges $45 to $60 for the first overweight bag and $90 to $110 for the second. Frontier's fees are similar. These airlines also tend to have lower base weight limits on some routes and charge for carry-on bags, so the total cost of flying with them can add up quickly if your luggage is heavy.

In contrast, Southwest includes two free checked bags for all passengers and does not charge overweight fees at all. This is a major advantage if you travel with heavy bags. If you frequently fly with overweight luggage, choosing an airline with more generous policies can save you hundreds of dollars per year.

Frequent flyer status and premium cabin waivers

Many airlines waive overweight fees for elite frequent flyer members. The threshold varies — some airlines waive fees for Gold members and above, while others only waive them for Platinum or Diamond members. Check your airline's frequent flyer program details to see what your status includes.

Passengers in premium cabin classes (business or first class) almost always get overweight fee waivers. If you are flying in premium economy or a paid premium economy seat, check your ticket details or contact the airline to confirm whether overweight fees are waived. Some airlines also waive overweight fees for passengers who purchase premium seat selections, so it is worth asking before you pay the fee at the counter.

International flights and different weight standards

International airlines and flights to certain countries may use different weight limits and fees. Many European and Asian carriers use a 23-kilogram (about 50 pounds) limit but charge in euros or other currencies, making direct comparison difficult. Some international carriers allow higher weight limits — up to 70 pounds — as standard.

If you are flying internationally, check the specific airline's baggage policy for your route. The fee structure may differ from what you see on domestic flights. Some airlines charge by weight tier in kilograms, and the conversion to pounds can be confusing. When in doubt, contact the airline directly or check your booking confirmation, which should list the baggage allowance for your specific flight.

Strategies to avoid overweight fees

The simplest way to avoid overweight fees is to weigh your bag before you go to the airport. Many luggage stores and shipping centers have scales, and some airlines provide scales at the airport (though using one there leaves no time to repack). If your bag is close to the limit, remove items and pack them in a carry-on or a second checked bag if you have one free.

Distributing weight across multiple bags is often cheaper than paying an overweight fee. If you have two free checked bags, put heavier items in one and lighter items in the other so neither exceeds the limit. Some travelers buy an extra checked bag allowance before their trip — this can cost $25 to $50 depending on the airline, which may be less than the overweight fee. For frequent travelers, purchasing a baggage plan or elite status can eliminate overweight fees entirely.

Frequently Asked Questions

Do airlines charge for overweight carry-on bags?

Most airlines do not charge for overweight carry-on bags as long as the bag fits in the overhead bin or under the seat. However, if a carry-on is too large to fit, the gate agent may force-check it, and if it is overweight, you may be charged. Budget airlines like Spirit charge for carry-on bags regardless of weight, so check your airline's carry-on policy.

What happens if I don't know my bag is overweight until the airport?

You will be charged the overweight fee at the ticket counter when your bag is weighed. You can ask to repack and move items to a carry-on or another checked bag if you have one free, but you must do this before the bag is tagged. Once tagged, the airline will charge the fee. Arriving early gives you time to repack if needed.

Can I refuse to pay an overweight fee and take the bag as a carry-on instead?

No. If your checked bag is overweight, you must either pay the fee or remove the bag from the flight. You cannot move an already-checked bag to carry-on at the ticket counter. The only option is to pay the fee, repack before checking, or not fly with that bag.

Do overweight fees explore to both directions of a round trip?

Yes. If your bag is overweight on the outbound flight, you pay a fee. If it is overweight on the return flight, you pay again. The fees are charged separately for each flight segment. Some airlines allow you to purchase a baggage allowance for a round trip, which covers both directions.

Is there a weight limit for how heavy a single bag can be?

Most airlines refuse to transport bags heavier than 100 pounds, even with payment. Some set the limit at 70 pounds. Check your airline's policy — the maximum weight is usually listed in the baggage section of their website. If your bag exceeds the maximum, you will need to ship it separately or split the contents into multiple bags.