As a rule of thumb, aim for at least 60 to 90 minutes on a domestic layover and 2 to 3 hours on an international one. Those numbers buy you a comfortable connection. If you plan to leave the airport, you want a good deal more.
Most domestic connections need around an hour. Airlines publish a minimum connection time, often 45 to 60 minutes, but that is the legal floor, not a comfortable target. If you can change flights without re-checking bags and without switching terminals, 60 minutes is usually fine. Add a buffer at large hubs or during busy travel periods.
International connections need more room, typically 2 to 3 hours. You may have to change terminals, pass through transfer security, and in some cases clear immigration. Long-haul hubs are large, and a gate change at the far end of the airport can cost twenty minutes on its own.
| Connection type | Comfortable target |
|---|---|
| Domestic, same terminal | 60 minutes |
| Domestic, terminal change | 90 minutes |
| International, same airline | 2 hours |
| International, change of airline or terminal | 3 hours |
| Self-transfer or separate tickets | 3 to 4 hours |
Read these as comfortable minimums for a normal day, not as guarantees. Add time for a terminal change, immigration, or a first flight with a history of delays.
| Layover | Domestic | International |
|---|---|---|
| 45 minutes | Risky. Workable in one small terminal with an on-time arrival. | No. Below most airlines’ minimum connection times. |
| 1 hour | Usually fine in the same terminal. | Tight. No margin if anything slips. |
| 90 minutes | Comfortable, including a terminal change. | Workable, but not if you clear immigration. |
| 2 hours | Comfortable in almost any case. | The practical minimum for a relaxed connection. |
| 3 hours | More than enough. Time for a proper meal. | Comfortable, including immigration and a terminal change. |
| 6 hours or more | Long enough to be worth planning. See what to do on a long layover. | |
The numbers above assume one ticket, where the airline is responsible for getting you to your destination and will rebook you free of charge if the connection fails. On two separate tickets none of that applies. You collect your bags, clear immigration, check in again from the public side, and clear security a second time. If you miss the second flight, it is your loss and you buy a new one.
For a self-transfer on separate tickets, treat three hours as the domestic minimum and four to five hours as the international one. Check whether the two airports or terminals are actually connected before you book, and whether your bags can be checked through, because usually they cannot.
If your connection is below the airline’s minimum, the system normally will not sell it, but irregular operations can still leave you tight. If you are nervous about a short connection, ask at the gate about being re-accommodated, and keep carry-on essentials with you. If you are on a single ticket and miss the connection because of a delay, the airline will rebook you.
If you want to step out and see the city, the math is different. Plan for at least 3 hours on a domestic layover and considerably more internationally once immigration and a second security screening are added. See can you leave the airport during a layover for the full picture.
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For a domestic connection in the same terminal, usually yes. For an international connection or a terminal change, one hour is tight and leaves no margin for delays.
It is at or below many airlines’ minimum connection times. It can work in a single small terminal with an on-time arrival, but it is risky if anything slips.
On a single ticket the airline rebooks you on the next available flight at no charge. On separate tickets you may have to buy a new ticket, which is why self-transfers need a wide buffer.
Aim for 2 to 3 hours for a comfortable connection, and more if you are changing terminals, clearing immigration, or on separate tickets.
For a domestic connection in a single terminal it can work if the first flight lands on time. For anything international, or any terminal change, it is below a comfortable minimum and often below the airline’s own.
It is workable if you stay airside and do not change terminals. If the connection involves clearing immigration, as it does when the layover is your first point of entry, allow two to three hours instead.
Considerably longer than on a single ticket. Allow at least three hours domestically and four to five internationally, because you collect bags, check in again and clear security a second time, with no protection if you misconnect.