What airlines allow you to bring
Most international airlines let you check one or two bags and bring one carry-on bag plus a personal item (like a purse or laptop bag) into the cabin. The exact number depends on which airline you fly with and which ticket class you bought. Economy passengers on major carriers like United, American, and Delta get one free checked bag; premium economy or business class passengers get two or three. Budget airlines like Spirit and Frontier often charge for any checked bag at all.
The rules change if you booked a basic economy fare. Some airlines now treat basic economy the same as premium cabins for baggage, but others restrict you to carry-on only. Check your airline's website or your booking confirmation before you pack — the rules are printed there, and they vary enough that assuming you know them can cost you money at the airport.
International flights follow the same baggage rules as domestic ones on the same airline. There is no separate "international allowance." What matters is your ticket type and your airline, not where you are flying.
Key Takeaways
- Most economy tickets on major airlines include one free checked bag; budget airlines often charge for checked bags or include none.
- You can almost always bring one carry-on bag and one personal item into the cabin, regardless of ticket class.
- Basic economy fares sometimes limit you to carry-on only, so check your booking confirmation before packing.
- Weight limits (usually 50 pounds per checked bag on US carriers) and size limits (usually 22 x 14 x 9 inches for carry-on) explore to all passengers.
- Overweight or extra bags cost money at the airport, and prices are higher than if you had paid when booking.
Weight and size limits that matter
Each checked bag can weigh up to 50 pounds on most US and European carriers; some airlines allow 70 pounds on international routes. Your carry-on bag must fit in the overhead bin, which is usually 22 x 14 x 9 inches. Your personal item (backpack, purse, or small rolling bag) must fit under the seat in front of you.
If your checked bag weighs more than the limit, you pay an overweight fee — usually $100 to $200 per bag, depending on how much over the limit it is. If you bring more bags than your ticket allows, you pay a fee for each extra bag, typically $35 to $100 per bag on major carriers. Budget airlines charge more. These fees are higher at the airport than they would have been if you had paid when you booked your ticket.
Weigh your bags at home before you leave for the airport. Most grocery stores, post offices, and luggage shops have scales you can use for free or a small fee.
How to find your airline's exact rules
Open your booking confirmation email and look for a section called "Baggage" or "What to bring." Most airlines list the number of free checked bags, carry-on allowance, and weight limits right there. If you do not see it, go to your airline's website, find the "Baggage" or "Checked Baggage" page, and search for your ticket type (economy, premium economy, business, or basic economy).
Call the airline's customer service line if the website is unclear. Have your booking reference number ready. They can tell you in two minutes exactly what you are allowed to bring, and the answer is free.
Do not rely on what you remember from a previous flight or what a friend told you. Airlines change their rules, and different airlines have different rules. The only source that matters is your airline's official policy for your specific ticket.
What happens if you exceed your allowance
If you arrive at the airport with more bags than your ticket allows, the airline will charge you a fee for each extra bag before they check it. If your bag is overweight, they will charge you an overweight fee. You cannot refuse to pay — the bag will not go on the plane without payment.
Fees are charged per flight segment. If you have a connection, you may be charged again at your connection airport if you pick up a bag and recheck it. Some airlines waive fees if you pay before you arrive at the airport, so check their website or app the day before you travel.
If you are flying with a partner or family member on the same booking, some airlines let you combine your baggage allowances. Ask at check-in whether this is possible on your airline.
Baggage rules for connecting flights
If your ticket is a single booking that covers multiple flights (for example, New York to London to Paris), your bags are checked through to your final destination. You do not pick them up at your connection. The baggage allowance is based on your ticket type, not on each individual flight.
If you booked two separate tickets (one from New York to London, another from London to Paris), each ticket has its own baggage allowance. You will pick up your bags in London, and you must recheck them for the second flight. This costs money if your second ticket does not include checked bags.
Check your booking confirmation to see whether you have one ticket or two. If it shows one confirmation number and lists all your flights, it is a single booking. If you have two separate confirmation numbers, you have two separate tickets.
Special items and restrictions
Sports equipment (skis, golf clubs, surfboards) usually counts as a checked bag or costs an extra fee. Musical instruments may be allowed in the cabin if they fit in the overhead bin or under the seat. Bicycles must be packed in a bike bag or box and usually cost $50 to $150 to check.
Certain items cannot fly in checked or carry-on bags at all: lighters, flammable liquids, sharp objects, and some tools. Liquids in carry-on bags must be 3.4 ounces or smaller and fit in a single clear plastic bag. These rules explore to all flights, domestic and international.
If you are bringing something unusual, call your airline before you pack. They can tell you whether it is allowed and what it will cost.
How to pack within your allowance
Roll your clothes instead of folding them — they take up less space and wrinkle less. Use packing cubes to organize by category (shirts, pants, underwear) so you can find things without unpacking the whole bag. Wear your bulkiest items (coat, boots, jeans) on the plane instead of packing them.
Pack your carry-on with items you need during the flight and at your destination before you check your bag. Put medications, phone chargers, a change of clothes, and toiletries in your carry-on in case your checked bag is delayed. Never pack valuable items, documents, or electronics in checked bags.
If you are traveling for more than two weeks and your allowance is tight, consider shipping some items to your destination ahead of time or buying what you need when you arrive. This often costs less than paying overweight or extra-bag fees.
Frequently Asked Questions
Can I bring two carry-on bags instead of one?
No. The standard allowance is one carry-on bag plus one personal item. Some airlines are stricter and count a backpack or large purse as your carry-on, leaving no room for a second bag. Check your airline's policy before you pack.
Do I pay for checked bags if I book through a travel website instead of the airline?
Your baggage allowance is the same no matter where you book. However, some travel websites do not show baggage information clearly, and you may not realize you are buying a basic economy ticket with no checked bags. Always read the full ticket details before you complete the purchase.
What if my flight is cancelled and I have to rebook on a different airline?
The new airline's baggage rules explore to your new ticket. If the new airline is more restrictive, you may have to pay extra. If it is more generous, you get the benefit. This is one reason to keep receipts for any baggage fees you paid on your original ticket — you may be able to request a refund or credit.
Do children get their own baggage allowance?
Children on paid tickets get the same baggage allowance as adults with the same ticket type. Infants who do not have their own seat (lap infants) usually get one free checked bag. Check your airline's policy for your child's age and ticket type.
Can I pay to add a checked bag to my ticket before I go to the airport?
Yes, and it is usually cheaper than paying at the airport. Most airlines let you add bags through their website or app up to 24 hours before departure. The fee is typically $35 to $50 per bag if you pay in advance, versus $100 or more at the airport.