A ticket that includes a 45-minute connection at Heathrow is not the same product as a 45-minute connection at Amsterdam. The airline sold both as legal but the operational reality behind them is completely different. Understanding minimum connection times (MCT) - and their limits - is central to whether a trip flows smoothly.
Minimum connection time
MCT is a published number that IATA maintains for every airport, for every combination of terminals and airline pairs. If your itinerary meets or exceeds MCT and you miss your connection, the airline is obligated to rebook you free. If it does not meet MCT, you are on your own.
Airlines will not sell a connection under MCT through their normal booking systems. But you might build a sub-MCT connection using two separate tickets on different airlines. That is legal for the passenger but leaves you unprotected.
Airport-specific realities
| Hub | Domestic-to-domestic MCT | International-to-international MCT | Notes |
|---|---|---|---|
| ATL | 35 min | 60 min | Compact hub, moves fast |
| ORD | 45 min | 70 min | Weather delays common |
| LHR | 60 min same terminal | 90-120 min terminal change | T5-T3 is a shuttle |
| CDG | 60 min | 90 min | Terminal changes can add 30+ min |
| DXB | 60 min | 90 min | Terminal 3 to Terminal 2 is a full transfer |
| FRA | 45 min | 75 min | Terminal 1 to Terminal 2 requires shuttle |
| AMS | 40 min | 50 min | One terminal, very efficient |
| SIN | 50 min | 60 min | Terminal changes but well connected |
A useful add-on rule: for any connection under 90 minutes at a large hub, allow at least 30 minutes of buffer over MCT. For any connection between two international flights on separate tickets, allow 3 hours minimum.
Same airline vs interline vs separate tickets
- Same airline, one ticket: bags transfer automatically; airline responsible for rebooking on delay.
- Interline partners on one ticket: bags transfer, airline responsible for rebooking (which they arrange with the interline partner).
- Codeshare on one ticket: same as interline; single PNR.
- Two separate tickets: bags do not transfer, airline has no responsibility if you miss the second flight, you must clear customs/immigration if changing airlines internationally.
When the inbound is late
- As soon as you see the inbound is behind schedule and your connection is at risk, open the airline app and check what the next flight to your final destination is.
- If the inbound is running so late that you will definitely miss the connection, the airline's system usually rebooks you automatically before you land. Check your email/app.
- If not automatically rebooked, call from the plane if wifi permits. Getting the rebooking done before landing means walking off into an already-solved problem.
- At the connecting airport, look for the dedicated 'connections' desk (most large hubs have one) rather than the general customer service line.
- If the missed connection was caused by the airline's inbound (weather is not the airline's fault; mechanical is), request compensation - EU 261 at EU-departing flights, care obligations everywhere.
See also: layovers explained, minimum connection time definitions in the glossary, and airport check-in guide.
Frequently asked
What if my connection is just barely above MCT?+
Legal but risky. Add 30 minutes of buffer where possible. If your ticket has a self-transfer element or requires terminal change, add more.
Do I need to re-clear security on a connection?+
Sometimes. Same-terminal transfers usually no; changing terminals in the US or UK often yes. Check the airport's transit map.
Are checked bags transferred automatically on a single ticket?+
Yes on legacy carriers with interline agreements. Not on Ryanair, Wizz, or many low-cost operators.
Aisha Owen
Airport operations writer at AirHelpService
Writes about air travel operations, passenger rights and airport procedures. Reader questions and corrections welcome via our contact page.
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