Minimum Connection Time Explained
Quick answer
Minimum connection time (MCT) is the shortest gap an airport considers safe to change flights. It varies by terminal and by domestic vs international transfers. If your layover is below the MCT, your itinerary may not be protected, so always pad above it.
Minimum connection time (MCT) is the shortest legal gap an airport and airline will sell between a connecting arrival and departure — accounting for walking, terminal changes, immigration and baggage. Booking at or near the MCT is risky; a delay can cost you the flight. Always build a buffer above the MCT, especially at large hubs or where you change terminals. For tight cases, see short layover tips.
- MCT is the shortest legal connection an airline will sell.
- It varies by airport, terminals, and domestic vs international.
- Always book above MCT with a buffer — see short layover tips.
- Separate tickets ignore MCT — see self-transfer.
Minimum connection time is the single most useful number when judging a layover, yet most travellers never look it up. Understanding it tells you whether a tight connection is genuinely risky or just feels that way. Here's how it works.
How MCT works
Airports publish minimum connection times that airlines use to build valid itineraries. The figure differs by transfer type — international-to-international often differs from domestic — and by whether you change terminals. A connection booked on one ticket above the MCT is considered protected; below it usually isn't sold.
- MCT varies by terminal and transfer type
- International transfers often need longer than domestic
- On-ticket connections above MCT are protected
Using it to judge a layover
Treat the MCT as a floor, not a target. Add margin for large airports, immigration, baggage re-check on separate tickets, and your own pace. When in doubt, a longer layover removes stress and the risk of a missed connection cascading through your trip.
What MCT covers and why it matters
MCT bakes in the realistic time to move between flights — walking, shuttle transfers, immigration and re-checking bags where required. On a single ticket, if you booked above the MCT and a delay makes you misconnect, the airline rebooks you. Below it, you're outside protected territory. See how to avoid missing connecting flights.
How much buffer to add
Add more than the minimum at large or busy hubs, when changing terminals, when clearing immigration, and for the last flight of the day. On separate tickets the MCT doesn't apply at all — leave hours, not minutes. The classic errors are in common transit mistakes.
Pre-transit checklist
0 / 8Can you leave the airport? Let's check.
Enter your layover length and we'll estimate whether it's safe to leave, what you can realistically do, and the latest time you should be back at security.
Guidance only — immigration queues, terminal changes and airline minimums vary. Always leave a comfortable margin.
Connection time: how much is safe?
| Your gap | Risk | What to do |
|---|---|---|
| Well above MCT | Low | Relax; move at a normal pace |
| At/near MCT | Medium | Sit near front; go straight to the gate |
| Below MCT | High | Not protected — rebook or rebuild the trip |
| Self-transfer | High | MCT doesn't apply — see self-transfer |
Frequently asked questions
What happens if my layover is below the minimum connection time?
Itineraries below the MCT usually aren't sold on a single ticket, and if you book separate tickets you carry the risk yourself. Always aim above the published minimum.
Why is international connection time longer?
International transfers can involve immigration, security re-checks and longer walks between terminals, so airports set higher minimums than for domestic connections.
What is minimum connection time?
It's the shortest legal gap an airport and airline will sell between connecting flights, accounting for walking, terminal changes, immigration and baggage.
Is it safe to book the minimum connection time?
It's risky — a delay can cost you the flight. Book above the MCT with a buffer, especially at big hubs. See short layover tips.
Layover tips that actually help
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