Do I have to go through security again during a layover?

For domestic U.S. layovers, no. You stay inside the secure area of the airport and walk directly to your next gate. For international connections arriving in the U.S., yes. You'll clear customs and immigration, collect your bags, re-check them, and go through security again.

How long should my layover be?

For domestic flights, aim for at least 60-90 minutes. For international connections, 2-3 hours minimum. At large, complex airports like Chicago O'Hare, add extra time. If it's your first time connecting, err on the side of more time.

Do my bags transfer automatically during a layover?

Yes, if you booked your entire trip on one ticket. Your checked bags will be transferred to your connecting flight without you touching them. The exception is international arrivals into the U.S., where you must collect your bags, take them through customs, and re-check them.

What happens if I miss my connecting flight?

If both flights are on the same ticket, the airline will rebook you on the next available flight at no extra charge. If you booked separate tickets, the second airline has no obligation to help you, and you may need to buy a new ticket.

Can I leave the airport during a layover?

On domestic layovers, yes. You can exit and return, but you'll need to go through security again. On international layovers, it depends on the country's visa requirements. Some countries require a transit visa just to leave the airport.

What Is a Layover and How Does It Work?

The Short Answer

A layover is a stop at an intermediate airport between your departure city and your final destination. You get off one plane, wait at the airport, and board a different plane to continue your trip. Your bags usually transfer automatically, and on domestic connections you don't need to go through security again.

How a Layover Actually Works

Let's walk through it step by step. Say you're flying from Miami to Seattle, and your itinerary has a layover in Dallas.

Flight 1: Miami to Dallas. You land, grab your carry-on, and walk off the plane.

The layover: You're now in the Dallas airport. Check the departure screens for your next flight's gate number. Walk to that gate. Wait.

Flight 2: Dallas to Seattle. Board your second plane when your group is called. That's it.

You stay inside the airport the entire time. No need to go through security again on domestic flights. No need to collect your checked bags. They'll be transferred to your next flight automatically.

Layover vs. Stopover vs. Connecting Flight

These terms get thrown around interchangeably, but they mean different things:

Layover: A short wait (under 24 hours) between flights at a connecting airport. You stay in the airport.
Stopover: A longer break (24+ hours) at an intermediate city. Some travelers do this intentionally to explore a bonus destination.
Connecting flight: The second (or third) flight on your itinerary. The layover is the gap between connecting flights.
Direct flight: A flight that goes to your destination without you changing planes, though it might make a stop along the way. You stay on the same aircraft.
Nonstop flight: No stops at all. Point A to Point B without landing in between.

How Much Layover Time Do You Need?

This is the question that keeps people up at night. Here's what I recommend:

Domestic Connections

Minimum safe layover: 60 minutes
Comfortable layover: 90 minutes to 2 hours
Large or complex airports (ORD, DFW, ATL): At least 90 minutes, ideally 2 hours

Airlines won't sell you an itinerary with a layover shorter than their minimum connection time (MCT) for that airport. But "minimum" doesn't mean "comfortable." If your first flight lands 10 minutes late, a 45-minute connection suddenly becomes a sprint.

International Connections

Minimum safe layover: 2 hours
Comfortable layover: 3 hours
Complex international hubs: 3+ hours

International connections take longer because you may need to clear customs, go through immigration, re-collect your bags, re-check them, and pass through security again. At some airports, international transfers require changing terminals entirely.

Specific Airport Examples

Every airport has different MCTs set by the airlines:

Atlanta (ATL): 1.5 hours domestic, 2 hours international
Chicago O'Hare (ORD): 2 hours domestic, 2.5-3 hours international
San Francisco (SFO): 50 minutes domestic-to-domestic, 1 hour 45 minutes for international
Toronto (YYZ): 40 minutes domestic, 1 hour for domestic-to-international

What Happens to Your Bags During a Layover?

If you booked your entire trip on one ticket (one confirmation number), your checked bags are transferred automatically between flights. You don't touch them during the layover. They go from your first plane to your second plane behind the scenes.

There are two exceptions:

International arrivals into the U.S.: You must collect your checked bags at your first U.S. airport, carry them through customs, and re-check them at a drop-off point. This is a federal requirement regardless of airline.
Separate tickets: If you booked two separate tickets (two confirmation numbers), your bags will not transfer automatically. You'll need to collect them, exit, re-check in, and go through security again. This is a major reason to avoid booking separate tickets for connecting flights.

What to Do During a Layover

Short Layover (Under 2 Hours)

Don't mess around. Go directly to your next gate. Check the departure screens as soon as you get off your first flight. If your gate is in a different terminal or concourse, start walking immediately.

Use the restroom near your departure gate. Grab a quick snack if there's a shop nearby. Stay close and keep an eye on the departure board for any gate changes.

Medium Layover (2-4 Hours)

You've got time to relax. Find your gate first so you know where it is and how long the walk takes. Then explore a bit. Eat a proper meal. Browse the shops. Charge your phone at a charging station.

If you have a credit card with lounge access (like the Amex Platinum or Capital One Venture X), this is a great time to use it. Airport lounges offer free food, drinks, WiFi, and comfortable seating.

Long Layover (4+ Hours)

Consider these options:

Airport lounge: Day passes typically cost $40-$65 if you don't have membership access.
Explore the airport: Large hubs like Singapore Changi, Dubai, and Amsterdam Schiphol have gardens, museums, and even showers.
Leave the airport: On domestic layovers, you can leave and come back. Just make sure you have enough time to re-clear security. Allow at least 2 hours before your next flight to be safe.

Can You Leave the Airport During a Layover?

Domestic layovers: Yes. You can leave and return. You'll need to go through security again, so factor that time in. There's no exit process. You just walk out.

International layovers: It depends. Some countries require a transit visa even to leave the airport. Others let you out freely. Check the visa requirements for your layover country before making plans. If you're transiting through the U.S., you'll go through customs and immigration regardless, which means you're technically "in" the country during your layover.

What If You Miss Your Connection?

If you booked on one ticket and miss your connecting flight, the airline will rebook you on the next available flight at no extra charge. This is true whether the missed connection was due to a late arrival, weather, or mechanical issues.

Head to the airline's customer service desk or use their app to get rebooked. If the next flight isn't until the next day, the airline should provide hotel and meal vouchers if the delay was their fault (mechanical, crew shortage). Weather delays are a gray area, but airlines will still rebook you for free.

If you booked on separate tickets, you're on your own. The second airline has no obligation to rebook you. This is the biggest risk of booking separate tickets and the main reason I don't recommend it.

Tips for Smooth Layovers

Download the airline's app. Gate changes and delays show up here faster than on the airport screens.
Book longer connections if it's your first time. Peace of mind is worth an extra hour at the airport.
Sit near the front of your first flight. You'll deplane faster and have more time for your connection.
Pack essentials in your carry-on. Snacks, charger, medications, a change of clothes. If your bags don't make the connection, you'll be fine.
Know your terminal. Some airports require a train or shuttle between terminals. Check this before you fly.
Avoid booking the last connection of the day. If you miss it, you're stuck overnight. Earlier connections give you fallback options.

Overnight Layovers

Sometimes you'll end up with an overnight layover, either by choice (cheaper fares) or because of delays. Here's what happens:

If the airline scheduled it: Many international itineraries include planned overnight layovers. The airline may or may not provide a hotel. Check your booking confirmation.
If it's due to a delay/cancellation: The airline should provide hotel and meal vouchers if it was their fault. Ask at the customer service desk.
Sleeping in the airport: It's not glamorous, but people do it. Websites like SleepingInAirports.net rate airports on their overnight comfort. Bring a travel pillow and blanket.