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Travel Connection Checker

Estimate your odds of making a flight connection, step by step.

min

Check your boarding pass; often 10–20 minutes.

%

Planning default; replace with the route’s on-time record if you know it.

min
min

From the airline/airport for your connection type.

Try an example: Schengen → non-Schengen at a large hub, 70 min · US arrival with baggage recheck, 2 h 30

How it works

Enter your arrival and onward departure times and what you have to do in between (terminal change, passport control, security, baggage). The checker adds up transparent time ranges for each step, compares them with your connection time and estimates the chance of making it under a simple inbound-delay model. It is an estimate, never a guarantee.

  • Available time = scheduled departure − scheduled arrival − gate-closure minutes.
  • Required time = deplaning + walking (+ terminal change) + optional immigration, security and baggage re-check, each an editorial [best, typical, worst] range by airport size; walking and terminal transfer are multiplied by 1.4 (slow) / 1.0 / 0.8 (fast).
  • Buffer = available − required, for each of best/typical/worst.
  • Inbound delay model: on time with probability p, otherwise delay ~ Exponential(mean delay). P(miss) = (1 − p)·e^(−buffer/mean) if buffer ≥ 0, else 100%. P(make) = 1 − P(miss). Early arrivals and onward-flight delays are ignored (both would help).
  • Overall chance: total processing time is treated as a triangular distribution between the best, typical and worst totals, and P(make) is averaged over it numerically (400 slices). The best/worst columns show the chance if processing is at its fastest/slowest.
  • Verdict from the overall chance: ≥ 95% comfortable, ≥ 85% ok, ≥ 70% tight, ≥ 50% risky, below that very risky.

A planning estimate from simplified assumptions — not a guarantee. Airline, airport and border procedures and queues vary widely.

For scripts and AI agents

  • JSON API: POST https://travelconnectionchecker.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://travelconnectionchecker.usefulweb.site/mcp · tool name travel_connection_checker
Example request
curl -s -X POST https://travelconnectionchecker.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"arrival":"2026-11-03T09:40","departure":"2026-11-03T10:50","terminalChange":true,"immigration":true,"securityRecheck":false,"baggageRecheck":false,"airportSize":"large","walkingSpeed":"average","gateClosesMinutes":15,"onTimeProbability":75,"meanDelayMinutes":35,"officialMct":50}'

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