Quick answer
Reviewed · 4 min read
Book connections on a single ticket so the airline is responsible if you misconnect, and give yourself more than the minimum: an hour or more domestically, and two to three hours when you change terminals or clear immigration abroad. Arriving from overseas, you clear US customs at your first US airport and usually recheck your bags before connecting.
Researched and maintained by Empyrean Travel · How we research
- Safest booking
- One ticket for the whole journey
- Domestic buffer
- 60–90 minutes is comfortable
- International buffer
- 2–3 hours with customs or terminal changes
- Entering the US
- Customs at your first US airport
How much time do you really need between flights?
Every airport sets a minimum connection time, the shortest connection an airline can legally sell. It assumes everything goes right: an on-time arrival, a nearby gate and short lines. It leaves no room for a late inbound flight, a long taxi or a terminal train.
As a rule of thumb, a domestic connection of 60 to 90 minutes is comfortable at most US hubs. Allow two to three hours when you must change terminals, clear immigration or customs, or switch airlines. In winter, add margin at hubs prone to snow and thunderstorms, or choose a connection point with better weather.
Why does booking everything on one ticket matter?
When all your flights are on one ticket, the airline is responsible for getting you to your final destination. If the first flight runs late and you miss the second, it rebooks you, and your checked bags follow you through. Partner airlines with interline agreements can do the same across carriers.
On separate tickets, the second airline sees only a passenger who didn’t show up. You may lose that ticket and pay for a new one, and you’ll usually have to collect and recheck your bags yourself. Self-transfer itineraries can save money, but build in many hours, not minutes, if you use them.
What happens with bags and customs on international connections?
Flying home from abroad, you clear US immigration and customs at your first US airport, even if you’re connecting onward. You collect your checked bags, take them through customs, then drop them at a recheck belt and go through security again. Global Entry or Mobile Passport Control can cut that time considerably.
Some airports abroad, including Dublin, Shannon, Abu Dhabi, Toronto and Vancouver, offer US preclearance: you complete US entry before departure and land in the US as a domestic arrival. In Europe, you usually pass passport control at your first Schengen airport, so a connection in Frankfurt or Paris includes an immigration line.
How do you make a tight connection?
If time is short, every minute counts. A few habits make a real difference.
- Choose an aisle seat near the front of the cabin
- Travel with carry-on bags only when you can
- Check your arrival and departure gates in the airline’s app before landing
- Look at the airport map so you know whether you need a train or bus between terminals
- Tell a flight attendant about a very tight connection; they sometimes help passengers off first
- If you can see you’ll miss it, start rebooking in the app right away
When is a long layover or stopover worth it?
A long layover can be a gift with lounge access; see our airport lounge access guide. On very long journeys, a planned overnight in a hub city can turn a grueling trip into two easy ones.
Some airlines even let you add a stop of a few days at no extra airfare. Our guide to stopover programs explains how they work. If you do miss a connection despite your planning, follow our missed connection guide.
Frequently asked questions
How much time do I need for an international connection?
Do I have to recheck my bags on a connecting flight?
What happens if I miss a connection on separate tickets?
Do I go through customs on a connecting flight to the US?
What is a legal connection?
Official sources
Rules, fees and schedules change — confirm the latest details at the source before you travel.