Most airlines cap a checked bag at 50 pounds, or 23 kilograms. That number is airline policy, not a federal rule. Checked baggage weight restrictions come from each carrier’s own contract of carriage, not from the Transportation Security Administration.
Go a few pounds over the line and you pay a fee. Go well over it and the bag gets refused at the counter. No amount of money fixes that second case.
Checked baggage weight restrictions: the 50 lb / 23 kg standard
Fifty pounds, or 23 kilograms, is the default economy allowance on nearly every US and major international carrier. It applies per bag, not per ticket. Two checked bags each get their own 50 lb budget, they do not share 100 lb between them.
It is worth repeating because so many travelers assume otherwise. There is no tsa weight limit for checked baggage of any kind. TSA screens what is inside a bag for security threats, and it has no rule on how much the bag itself weighs.
The 70 lb / 32 kg tier for premium and international fares
Premium cabins get a heavier allowance. Delta gives Delta One and Delta First passengers 70 lb, or 32 kg, per bag. American matches it for First and Business Class, and British Airways does the same for Premium Economy, Business, and First.
Some international coach fares also step up to this tier on certain routes. That is common where a weight based allowance replaces the piece system used inside the US. Read your fare rules before assuming a domestic 50 lb figure travels with you overseas, since international checked baggage weight allowances vary by carrier and by fare class.
The hard ceiling: where a bag gets refused, not charged
Every carrier draws a line above which no fee applies, because the bag simply will not be accepted. American will not check anything over 100 lb, or 45 kg, on its own flights. Delta sets that same 100 lb ceiling on most routes.
Delta drops to 70 lb on some routes to Europe and North Africa. British Airways sets its ceiling lower still, at 32 kg, or 70 lb, on any checked bag in any cabin. Past that weight, ramp workers are not permitted to lift the bag by hand.
That is a safety rule, not just a pricing one. If your bag is near a ceiling like this, redistribute the load or ship the excess ahead. Do not assume an agent will make an exception.
What overweight actually costs
The bands below come from each airline’s own baggage page, checked today. Fees are one way, per bag, and they can change by route or season. Treat these as the current published rate, not a permanent number.
| Airline | Standard limit | Premium tier | Overweight fee | Hard ceiling |
|---|---|---|---|---|
| Delta | 50 lb / 23 kg | 70 lb / 32 kg (Delta One, Delta First) | $100 for 51 to 70 lb, $200 for 71 to 100 lb on US and Canada routes | 100 lb (70 lb on some Europe and North Africa routes) |
| American | 50 lb / 23 kg | 70 lb / 32 kg (First, Business) | $30 for 50 to 53 lb, then $100 to $200 for 53 to 70 lb depending on region | 100 lb / 45 kg |
| British Airways | 23 kg / 50 lb (Economy) | 32 kg / 70 lb (Premium Economy, Business, First) | Flat charge, about 100 USD one way, for a bag between 23 and 32 kg | 32 kg, refused above that at any price |
Southwest also publishes a 50 lb standard limit per bag, matching the rest of the industry. This session could not independently confirm its exact overweight fee bands from a current source. Check that number on the fee breakdown page before you fly.
Moving weight between two bags: what actually happens at the counter
This is the question forums get asked constantly. The honest answer is that it depends on the agent working that counter. Reports from FlyerTalk and similar boards describe carriers routinely allowing a swap between two bags checked together, as long as neither ends up over the ceiling.
Other reports describe the opposite. One agent weighs each bag on its own and charges the fee on the heavy one. A traveler on the very same route reports a different agent waving the rebalance through without a word.
The pattern that repeats is very little give at the 50 lb line itself, even a single pound over. What varies is whether shifting a few items between two bags gets allowed. Weigh both bags at home and even out the load yourself, rather than counting on the counter to fix it.
How to weigh a bag before you leave home
A dedicated luggage scale is the cheapest way to know your number for certain. Most cost less than a single overweight fee. Clip it to the handle, lift, and read the display before the bag leaves the house.
No scale in the house works too. Weigh yourself holding the bag on a bathroom scale, then weigh yourself alone, and subtract the difference. Airports keep scales near check-in counters and self-service kiosks, so a quick weigh there still beats a surprise at the belt.
Domestic versus international allowances
Domestic US flights almost always use the piece system. That means a flat 50 lb per bag, with the airline’s own fee schedule covering anything heavier. Domestic checked baggage weight rarely changes by route once you know your carrier’s base number.
International tickets are less predictable. Some routes keep the piece system with a higher 70 lb premium tier. Others, especially outside North America, use a strict per kilogram allowance tied to the fare class itself.
Always check the specific rules for your route. Do not assume domestic habits carry over, and use a baggage cost calculator if your trip mixes carriers. This is where checked baggage weight restrictions catch travelers off guard most often, on a connection that crosses from one system into the other.
Common questions
Is there a TSA weight limit for checked baggage?
No. TSA screens bag contents for security and has no published weight rule. The 50 lb figure travelers hear about comes from the airline, not from TSA.
How much can checked luggage weigh before it costs extra?
On most US and major international carriers, 50 lb, or 23 kg, is the free threshold in economy. Premium cabins usually get 70 lb, or 32 kg, before a fee applies.
Can I move weight from an overweight bag into another one at check-in?
Sometimes, and it depends on the agent working the counter that day. Travelers report both outcomes on the same airline. Pack evenly at home rather than planning to rebalance at the desk.
What is the absolute maximum weight airlines will accept for checked baggage?
Most US carriers stop at 100 lb, or 45 kg, per bag at any price. British Airways and several international carriers cap sooner, at 32 kg, or 70 lb, for the safety of the workers lifting it.
Do international flights use different weight allowances than domestic ones?
Often, yes. Many routes outside North America use a per kilogram system tied to the fare class, instead of the flat 50 lb rule that dominates domestic US travel.
What is the cheapest way to check my bag’s weight before the airport?
A handheld luggage scale is the most reliable option, and it costs a fraction of an overweight fee. The bathroom scale trick works nearly as well if you do not want to buy one.
The bottom line on checked baggage weight restrictions is simple. Fifty pounds covers domestic economy, 70 lb covers most premium and some international fares, and the hard stop lands at 100 lb on most US carriers or 32 kg on several international ones. Weigh your bags at home, use the rebalancing tool to plan the split between two bags, and treat any agent’s willingness to shift weight at the counter as a favor, not a right.
For everything else about packing and checking a bag, the checked baggage guide covers the rest. Compare full fee schedules on the Delta baggage page and the American baggage page before your next trip.