You must prepay for your checked bags at least 24 hours before your flight to receive any discount. Prices are based on standard sized bags for one-way flights. Oversized and overweight bags, as well as special items, must be paid for at the airport.
During online check-in: With less than 24 hours to your flight, baggage allowance can be added through the web check-in portal. You can add baggage through the web check-in portal up until 1 hour prior departure.
The price depends on the carriers and the conditions of each booking. You'll always see it next to each baggage option. It's generally cheaper to add baggage during booking because most carriers increase the price later.
It's rare to find U.S. airlines with free checked baggage. Southwest Airlines is the only airline without any bag fees. For other airlines, you'll need to earn elite status or book your tickets with an airline credit card.
For most major U.S. airlines, fliers can expect to pay $30 to $35 each way to check a bag when flying economy class on a domestic route. Travelers can save money by earning elite status or getting a credit card with free baggage perks.
Before you check into your flight, you can buy an additional bag to put in the hold. This is a costly option that gets more expensive the closer to your date of departure and even costlier if added on at the airport. There are still weight limitations and not every airline will allow you to book an extra suitcase.
International flights allow one, and often two, pieces of checked luggage per passenger. International luggage allowance is often influenced by whether the flight is intracontinental (within the same continent) or intercontinental (across the ocean or spanning different continents).
Free checked bags for Delta Medallion membersOne free checked bag within the U.S. and Canada. One free checked bag in addition to the standard allowance on international flights.
Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.
It's nearly always cheaper to book extra hold luggage in advance rather than paying excess baggage fees at the airport. Airlines know that keeping within weight/size limits is not always possible, so they encourage you to plan ahead by selling extra weight online.