For an international flight from a US airport, plan to arrive about three hours before departure. That is what Delta and TSA both recommend. The hard limit is earlier than most travelers think: Delta and American require you to be checked in, with bags dropped, at least 60 minutes before departure on most international flights, and some routes close at 75, 90 or even 120 minutes. Miss that cutoff and the airline can refuse to check you in, even if the plane is still at the gate.
The cutoffs that actually decide whether you fly
An arrival recommendation is advice. A check-in cutoff is a rule, and it is the number to plan backward from.
Delta
Delta's international check-in page says you must be checked in at least one hour before scheduled departure, and it recommends being at the gate and ready to board 45 minutes before departure. It suggests arriving at the airport at least three hours ahead. Some airports require earlier check-in, and Delta will not check you in after that time. On its list, Brussels, Dublin, Frankfurt, Toronto, Montreal, Vancouver and Calgary, among others, close at 75 minutes, several African and Caribbean airports at 90 minutes, and Athens and Accra at 120 minutes. Those are mostly for flights back to the US, but they are worth knowing when you plan the return.
American Airlines
American publishes its own minimum check-in and bag-drop times, commonly 60 minutes before an international departure from the US, with longer cutoffs at some airports. Check American's check-in page or app for the exact time for your flight and airport.
United and other airlines
United's minimum times for check-in, bag drop and boarding also vary by departure airport and destination, so check the United app or united.com for your flight. Assume 60 minutes as the floor for any international departure from the US, and check the exact figure for your flight a day before you go.
Why three hours, and when you can cut it
TSA's travel advice for international flights is also to arrive three hours early, because the time has to cover parking or drop-off, the check-in or bag-drop line, security and the walk to the gate, which at large airports can include a train. International flights also board earlier than domestic ones. Delta asks international passengers to be at the gate 45 minutes out, and boarding often starts before that on widebody aircraft.
You can reasonably cut the buffer when all of these are true:
- You are traveling with carry-on only and checked in online, so you can skip the counter. Some airlines still need to see your passport at the airport before an international flight, so read your boarding-pass instructions.
- You have TSA PreCheck and your Known Traveler Number is on the booking, so it prints on your boarding pass.
- You are leaving from an airport you know, at an off-peak time, on a weekday.
Add time instead when you are checking bags, traveling with children or a lot of gear, flying on a holiday weekend, or departing from a terminal under construction.
What PreCheck and Global Entry change
TSA PreCheck speeds up the security checkpoint when you leave the US. TSA says about 99% of PreCheck passengers wait less than 10 minutes, though peak periods can run longer. It only helps if your Known Traveler Number is attached to the reservation and the airline participates.
Global Entry speeds up US customs and immigration when you come home. It includes PreCheck, so it helps at departure through the PreCheck benefit only, not through any separate lane. Neither program gets you past a check-in cutoff: if your bag is not dropped in time, membership will not change the airline's answer. Our guide to Global Entry vs TSA PreCheck covers which one fits your travel.
Check security wait times before you leave home
- MyTSA app: TSA's official app lets travelers check and post security wait times reported by other travelers, and shows delays and current weather at airports. Reports are crowd-sourced, so treat them as a guide.
- Your airport's website: many large US airports show live checkpoint waits by terminal.
- Your airline's app: it shows your gate, boarding time and the check-in cutoff for your specific flight, and it is the first place a gate change appears.
Big airports and terminal changes
At a large hub, the time between the curb and the gate can be longer than the security line itself. Confirm the terminal on your booking, not from memory: airlines move between terminals, and international flights often leave from a different terminal than the same airline's domestic flights.
New York JFK is the clearest current example. The airport is building new terminals, and its official site lists the new Terminal 6 as opening in Q4 2026, with Aer Lingus, ANA, Condor, Ethiopian Airlines and Icelandair among the airlines listed for it. If you are flying from JFK in the coming months, check which terminal your airline uses the week you travel, and allow extra time for construction detours and changed drop-off points. You can browse our flight guides from JFK, including New York JFK to London Heathrow.
Peak days need more time
TSA's busiest days come around the big holidays and summer weekends. It has screened more than 3 million people on each of its busiest days, most of them in 2025, and it expected more than 3 million on the Sunday after Thanksgiving 2025. On those days, and on the Friday before a long weekend, arriving at the three-hour mark is a minimum rather than a cushion. Early-morning departure banks at big hubs also produce long lines, because many international and domestic flights leave in the same window.
A simple plan to work backward from
- Find your flight's check-in and bag-drop cutoff in the airline app (usually 60 minutes for international departures from the US).
- Add the time for security at your airport and terminal, using MyTSA or the airport's wait-time page.
- Add the walk or train ride to your gate, and aim to be there by the airline's gate time (45 minutes before on Delta international flights).
- Add time for traffic, parking and any holiday rush. For most travelers this lands close to three hours.
Cutoffs shown are as of November 2026 and vary by airport. Check with the airline for your exact flight before you leave home. If you have a connection on the way, our layover guide explains how much time to leave between flights.
