The Difference Between the MCT and a Safe Connection
Every major airport publishes a Minimum Connection Time (MCT) โ the absolute shortest time the airport considers technically feasible for a standard transfer. The problem: the MCT is often optimistic. It assumes no delays on the inbound flight, that you are a healthy adult who can run, that your gate is nearby, and that immigration moves smoothly.
The safe connection time is typically 1.5โ2ร the official MCT.
Key Factors That Determine How Much Time You Need
1. Same airline vs. different airline
Same airline, same terminal: The fastest possible connection. 45โ60 minutes may work at smaller airports.
Different airlines (interline): You may need to retrieve checked bags, re-check them, and clear a different security checkpoint. Add 60โ90 minutes minimum.
Different airlines, separate tickets: No protection at all. If you miss the connection, you bought a new ticket. Always allow 2.5โ3 hours.
2. Domestic-to-domestic vs. international
Domestic to domestic: No customs โ just a gate change. 45โ75 minutes is realistic at most airports.
International arrival + domestic departure: You must clear customs and passport control, collect bags, re-check through domestic security. Minimum 90 minutes, ideally 2โ2.5 hours.
International to international: Depends on the country and your passport. EU-to-EU within Schengen: no passport control, 60โ75 minutes may work. Non-Schengen Europe: 90+ minutes. Asia/Middle East hubs: varies widely.
3. Airport layout and terminal distance
Some airports require a bus or train between terminals. Factor in:
- Frankfurt (FRA): 20โ30 minute transit between some terminals
- London Heathrow (LHR): 45โ60 minutes between T3 and T5 (different airlines)
- Tokyo Narita (NRT): 30+ minutes between international and domestic terminals
- Charles de Gaulle (CDG): CDG is notoriously large โ T2 gate-to-gate can take 45 minutes alone
Airport-by-Airport Connection Time Guide
| Airport | Domestic-to-Domestic | Intl-to-Domestic (Customs) | Intl-to-Intl (Schengen/No Passport) | Intl-to-Intl (Passport Required) |
|---|---|---|---|---|
| Singapore Changi (SIN) | 45 min | 75 min | 60 min | 75 min |
| Amsterdam Schiphol (AMS) | N/A | 90 min | 45 min | 75 min |
| Dubai (DXB) | 45 min | N/A | 60 min | 75 min |
| London Heathrow (LHR) | 60 min | 90โ120 min | 60 min (T5) | 90 min |
| Frankfurt (FRA) | 45 min | 90 min | 45 min | 75 min |
| Tokyo Narita (NRT) | 90 min | 90 min | 75 min | 90 min |
| Chicago O'Hare (ORD) | 60 min | 90โ120 min | N/A | N/A |
| Atlanta (ATL) | 45 min | 90โ120 min | N/A | N/A |
| New York JFK | 75 min | 90โ120 min | 60 min | 90 min |
What Happens if You Miss Your Connection?
On the same booking (one ticket):
The airline is responsible for getting you to your destination. They must rebook you on the next available flight at no charge. Under EU 261, if the new arrival is 3+ hours late, you may also be entitled to compensation if the original delay was the airline's fault.
On separate tickets:
You are on your own. Purchase travel insurance that covers missed connections if you regularly book this way.
Red Flags: Connections to Avoid Booking
- Any international-to-domestic US connection under 90 minutes (customs and re-security)
- Any connection through Paris CDG under 75 minutes
- Any connection with a terminal change at LHR under 90 minutes
- Any budget airline connection (Ryanair/EasyJet) under 2.5 hours โ they almost never have interline agreements
Use the airport transfer calculator to check specific terminal pairs, lounge access, and whether your connection at a specific airport is realistic.