UtilibyImportant: how to use this guide
This guide explains the ideas behind a safe layover and shows how to work with rough numbers. It cannot tell you the official connection time for your itinerary. That figure comes from your airline or booking agent, who can see your flights, airports and ticket. Use the numbers below to compare options and spot a plan that looks too tight, then confirm the details before you rely on them.
What a layover and minimum connection time are
A layover is the time between your arriving flight landing and your next flight departing. Strictly, the clock that matters is the gap between your arrival at the gate and the time your next flight closes its boarding, which is shorter than the layover shown on your booking.
Minimum connection time (MCT) is the shortest transfer time that an airport and airline treat as workable for a particular connection. Booking systems use it to decide whether a connection can be sold as a single ticket. It is a floor for selling the itinerary, not a promise that you will be comfortable, and it assumes the first flight arrives on time.
That is why a plan can be bookable and still feel tight. The Layover Time Calculator works with approximate planning baselines and adds time for the factors below, so you can see whether you have a buffer on top. These baselines are not official MCTs.
What adds time to a connection
- Immigration and customs. If you enter a country at the layover airport, queues can be long and unpredictable.
- Security re-screening. Some connections, especially international-to-international, send you through security again.
- Terminal changes. You may need to walk, or take a train or bus, and sometimes pass through security again. The calculator allows 25 minutes as a planning figure.
- Bag recheck. If your bags are not checked through, you must collect and drop them again. The calculator allows 45 minutes as a planning figure.
- Separate tickets. The calculator adds 120 minutes to protect you if the first flight is late.
- Time of day and season. Early-morning, evening and holiday queues can be longer.
- Delays. A late arrival uses up your buffer before you even start.
Rough planning guide by connection type
The table shows the default planning baselines the calculator uses when it has no specific figure for an airport, plus the buffer the calculator treats as comfortable. They are not official minimum connection times.
| Connection | Planning baseline | Comfortable from |
|---|---|---|
| Domestic to domestic | 45 min | 75 min |
| Domestic to international | 60 min | 90 min |
| International to domestic | 90 min | 120 min |
| International to international | 75 min | 105 min |
In the calculator, a connection is Comfortable when your layover is at least 30 minutes above the baseline plus extras, Tight when you are 0 to 29 minutes above it, and Risky when you are below it. Those labels are planning aids, not predictions.
Some large hubs have higher baselines in the calculator, for example 90 to 120 minutes for some international arrivals in the United States, because immigration and bag recheck often take longer there. Real times vary, so check your airline for yours.
How to check your layover, step by step
Step 1: Work out the real gap
Take the scheduled arrival time of the first flight and the scheduled departure time of the second. Subtract the time the second flight stops boarding if you know it.
Step 2: Note the connection type
Is each flight domestic or international at this airport? International arrivals usually involve immigration, which adds time.
Step 3: Check terminals and bags
Look at the airport map for both flights, and ask your airline whether your bags are checked through to the final destination.
Step 4: Check the ticket type
Are both flights on a single booking? If not, treat it as a self-transfer and read the separate tickets section below.
Step 5: Enter the details
Type the layover airport code, the layover length, the connection type and the extras into the Layover Time Calculator. It shows a planning baseline, extra time, your buffer and a verdict.
Step 6: Confirm with your airline
If the verdict is Tight or Risky, consider a later second flight. In every case, confirm the official connection rules for your itinerary with your airline or booking agent.
See your buffer after allowing for terminal changes, bag rechecks and separate tickets.
Worked examples
These examples use the calculator's planning figures. They are illustrations, not official times for any airport.
Separate tickets and self-transfers
When you book two flights separately, each airline treats its own ticket on its own terms. If the first flight is late, the second airline usually has no duty to hold or rebook you, bags are often not checked through, and you may have to buy a new ticket. A self-transfer can still be good value, but it needs a larger buffer.
- Allow substantially more time than for a single ticket. The calculator adds 2 hours, which many travellers use as a starting point.
- Avoid the last flight of the day for the second leg if you can.
- Check whether you need a visa to leave the airport, and whether you must collect bags.
- Consider an overnight stay and travel insurance that covers missed connections, after reading its terms.
If you miss a connection
On a single ticket and where the delay was on your first flight, the airline will usually rebook you on its next available flight. What else you receive, such as meals or accommodation, depends on the airline, the cause of the delay and the law where you are travelling. In the European Union and the United Kingdom, specific passenger rights rules can apply, and our EU261 Compensation Calculator gives a rough estimate. Speak to the airline staff first, keep your receipts and read the official guidance for your situation.
Common layover mistakes
- Using the booking system as a safety measure. A connection that can be booked is not necessarily a comfortable one.
- Forgetting immigration. Arriving internationally can add a long queue.
- Ignoring terminal changes. Two flights on the same airline can still use different terminals.
- Counting the scheduled gap. Boarding closes before departure, and arrivals can be late.
- Assuming bags are checked through. Confirm it, especially on separate tickets.
- Skipping visa checks. Some transits need a visa, even if you never leave the airport.
Sources and further reading
- Your Europe: Air passenger rights, official EU guidance on delays, cancellations and missed connections.
- Your airline's conditions of carriage and its published connection or transfer information.
- The official government pages for every country on your route, for visa and transit rules.
Also see our Airport Arrival Time Calculator, Flight Time Calculator and Jet Lag Calculator.
Frequently asked questions
How long a layover do you need?
There is no single answer, because it depends on the airport, whether you change terminals, whether you cross immigration, and whether both flights are on one ticket. As a rough planning guide, many travellers allow about 1 hour for a domestic connection and 1.5 to 3 hours for an international one. Check the minimum connection time and the rules for your itinerary with your airline.
What is minimum connection time (MCT)?
Minimum connection time is the shortest transfer time that an airport and airline treat as workable for a given connection, and booking systems use it to decide whether a connection can be sold on one ticket. It is different from a comfortable layover, and the official figure for your itinerary comes from your airline or booking agent.
Is a 1-hour layover enough?
Sometimes for a simple domestic connection on one ticket, at the same terminal and with no bag recheck. It is usually too tight if you must clear immigration, change terminals or recheck bags, and any delay on the first flight can use up the whole margin.
Is a 2-hour layover enough for an international connection?
Often it is workable on a single ticket at an airport you know to be efficient, but it can be tight if you must clear immigration, security and a terminal change. Many travellers prefer 3 hours or more when anything about the connection is unusual. Confirm the details with your airline.
What happens if I miss my connecting flight?
If both flights are on a single ticket and the delay was on your first flight, the airline will usually rebook you on its next available flight, but the rules vary by airline and country. On separate tickets the second airline is often not obliged to rebook you, and you may have to buy a new ticket.
Why are separate tickets riskier?
Each airline treats its own ticket on its own terms. If the first flight is late and you miss the second, the second airline usually has no duty to protect the connection, and your bags may not be checked through. Many travellers add at least 2 hours to the baseline for a self-transfer and consider staying overnight.
Do I need to collect my bags on a layover?
Not always. On a single ticket, bags are usually checked through to the final destination, but some countries require you to collect and recheck them at the first point of entry. On separate tickets you normally collect and recheck them yourself. Ask the airline when you check in and look at the bag tag.
Do I need a transit visa for a layover?
It depends on your nationality, the country you transit through, whether you leave the airport and whether you stay airside. Rules differ by country and change over time, so check the official government or airline guidance for every country on your route before you book.
How do terminal changes affect a layover?
A terminal change can add anything from a short walk to a longer trip on a train or bus, and sometimes a second security check. The calculator adds 25 minutes as a planning allowance, and you should check the airport map and your airline for the real transfer time.
Does the Layover Time Calculator give official connection times?
No. It uses approximate planning baselines that are not official minimum connection times, and it is not affiliated with any airline or airport. Treat the result as a planning aid and confirm your connection with your airline or booking agent.