You don't have to. It can get you a better seat selection and cut down the time in lineups once you arrive at the airport for your flight, before you get to the airport but…you can just check in when you arrive. There's no issue with that.
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Most airlines open online check-in 24 hours prior to the flight. Some have a slightly longer window, up to 36 hours before the flight. Be sure to confirm the exact time with your airline.
Check-In Times at U.S. AirportsFor most airports, you must be checked in at least 30 minutes before your scheduled departure time (airports requiring additional time are listed below, Go to footer note). Additionally, you're required to be at the gate and ready to board 15 minutes before scheduled departure.
For a short-haul flight where you are only taking hand luggage, checking in online saves a lot of time and is therefore much better than checking in at the airport. If, on the other hand, you have to check in bulky luggage, it is better to use the classic check-in at the airport for security reasons.
The General Guideline for How Early You Should Get to the Airport. Generally speaking, most airlines advise that you arrive at the airport at least 2 hours prior to a domestic flight, and at least 3 hours prior to an international flight.
The general guideline on how early to get to the airport for a domestic flight is 2 hours. However, those traveling at a very busy time of year or out of a large airport might want to allow more time.
When you're traveling outside of the United States, we suggest arriving at least 3 hours prior to your departure. You must be checked in at least 1 hour before your scheduled departure. Additionally, we recommend being at the gate and ready to board 45 minutes before your scheduled departure time.
What are your rights when you miss a flight? If you missed a flight because you were late to the airport, you don't have any real rights. Most airlines will classify you as a no-show and keep your money. Note that your return flight will also be canceled automatically.
In most cases, you can check in at any time as long as your reservation is valid. However, if you arrive after the designated time for check-in (which usually varies depending on the establishment) you may be asked to call ahead or present a valid form of identification to confirm your reservation.
Generally speaking, you should arrive at the airport two hours before your flight for domestic travel and three hours before for international travel. This will give you enough time to check in, check your baggage, go through airport security, and relax before your flight.
Check-In Times at U.S. AirportsFor most airports, you must be checked in at least 30 minutes before your scheduled departure time (airports requiring additional time are listed below, Go to footer note). Additionally, you're required to be at the gate and ready to board 15 minutes before scheduled departure.
For international travel, a good rule is to arrive at the airport 3 hours prior to your flight. Take into account the time it takes to get through the check-in line, to pass security, and then to walk or ride (tram, bus) from the check-in area to your boarding area (your terminal and gate—listed on your boarding pass).
Flight information. Paper ticket (less and less common), OR. E-ticket with a confirmation number—usually sent via email if ticket is purchased online or through a travel agency, OR. Printed itinerary with a confirmation number.
You will simply sit around the airport waiting, because in many cases your flight will not even be open for check-in. In the U.S. the TSA recommends that you arrive at least two hours early for domestic flights, and three hours early for international flights.
The TSA and airports want you to get there earlier, each for its own reasons. The agency does not like to be rushed with screenings, even if there's a long security line. Airports want you to take advantage of their incredible shopping and dining facilities, which you can't do if you're rushing to the gate.
The TSA and airports want you to get there earlier, each for its own reasons. The agency does not like to be rushed with screenings, even if there's a long security line. Airports want you to take advantage of their incredible shopping and dining facilities, which you can't do if you're rushing to the gate.
In general, some airports will allow you to go through the security check-in much earlier while others may require you to arrive no earlier than 2-5 hours before the departing time. This is sometimes because the checked baggage counters and/or check-in gates are not open yet.
Two to three hours is the minimum recommended time for an international layover, but more might be needed. Sally French is a travel rewards expert who joined NerdWallet in 2020.