The Difference Between the MCT and a Safe Connection
Every major airport publishes a Minimum Connection Time (MCT) — 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 1.5–2× 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. 45–60 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 60–90 minutes minimum.
Different airlines, separate tickets: No protection at all. If you miss the connection, you bought a new ticket. Always allow 2.5–3 hours.
2. Domestic-to-domestic vs. international
Domestic to domestic: No customs — just a gate change. 45–75 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 2–2.5 hours.
International to international: Depends on the country and your passport. EU-to-EU within Schengen: no passport control, 60–75 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): 20–30 minute transit between some terminals
- London Heathrow (LHR): 45–60 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 — 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 | 90–120 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 | 90–120 min | N/A | N/A |
| Atlanta (ATL) | 45 min | 90–120 min | N/A | N/A |
| New York JFK | 75 min | 90–120 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 — 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.