How to use
Estimate usable airport connection time, transfer margin, and incoming delay tolerance using visible, editable transfer assumptions.
Enter the scheduled arrival-to-next-departure interval in hours and minutes. Choose a connection airport, connection type, ticket type and checked-bag status. Select an illustrative transfer scenario, then edit every process time to match your itinerary. Adjust incoming delay to see the margin and delay tolerance. Copy the estimate or use Print / Save PDF. Reset restores the 90-minute fixture and clears optional flight labels.
What connection time means
Scheduled connection time is the interval from the arriving flight’s scheduled arrival to the next flight’s scheduled departure. It is not all available for walking to the gate: leaving the plane, transfer processes and arriving at the gate before departure consume part of it. The calculator accepts 1–1,440 scheduled minutes.
How usable connection time is calculated
Usable connection minutes = scheduled connection − incoming delay − gate-arrival buffer. Remaining modeled margin = usable connection minutes − transfer-process estimate. Time until next departure is scheduled connection minus incoming delay. A negative value means the departure or gate-arrival target has passed in the scenario; it is not clamped into a misleading positive result.
Deplaning and walking time
Deplaning covers leaving the aircraft. Walking / airport transport covers your route between arrival and the next gate, including trains, buses or people movers. The initial 10 and 15 minutes are editable planning examples, not universal rules or airport-specific observations. Simple uses 5/10/0/0 minutes for deplaning/walking/passport/security; Typical uses 10/15/10/10; Complex uses 20/30/30/25. Other process components start at zero. None is an airport standard.
Passport control and security
Not every international transfer requires immigration or another security check. Requirements depend on airport, itinerary, country, terminal, transfer rules and traveler circumstances. Domestic/international connection type is descriptive and does not automatically impose deductions. Enter passport control / immigration and security / re-screening minutes explicitly, using zero when not applicable. This tool does not advise on visa or entry eligibility.
Terminal and concourse changes
Enable terminal or concourse change when relevant. Walking and airport transport are entered once in their own component; terminal-transfer overhead represents additional waiting or other time only. Avoid putting the same train journey in both fields. Airport identity never supplies an invented transfer duration. Consult the airport’s current transfer guidance and your actual gates.
Same-ticket vs self-transfer connections
Same-ticket handling and disruption protection may differ by itinerary and carrier. It does not guarantee rebooking, a connection, or baggage transfer. Separate-ticket/self-transfer itineraries may require baggage collection, re-check-in, security or immigration and may have different disruption protections. Ticket type alone never changes the raw connection math; select and enter the actual obligations.
Checked baggage and self-transfers
Having checked bags does not automatically deduct collection or re-check time. Confirm through-checking with your airline. Enable collection and re-check only when applicable, then enter both times. These fields are available for same-ticket itineraries too, because baggage may need reclaiming even on a through itinerary. For self-transfer, verify check-in and bag-drop deadlines separately: an adequate final gate margin does not prove an earlier deadline can be met.
As a separate baggage check, check luggage dimensions against a verified airline limit. A size comparison does not establish through-checking, bag-drop deadlines, reclaim time or whether the connection can be made.
Gate-arrival buffer
Be at gate this many minutes before departure is a user-selected planning buffer, not a claim about an airline’s gate-closing rule. The initial 15 minutes is an example. Use the deadline your airline gives you; the calculator allows 0–180 minutes. This buffer is kept separate from transfer-process time and deducted exactly once.
How delay survival works
Delay survival = scheduled connection − transfer process − gate buffer. It is the incoming delay that can be absorbed before modeled margin reaches zero, with all other assumptions unchanged. Scenario margin = delay survival − incoming delay. A negative zero-delay tolerance is displayed as minutes short even with no incoming delay. The slider and 10/15/20/30/45/60-minute scenarios all use the same pure calculation engine.
How the risk classification works
Heuristic planning thresholds use remaining margin: at least 30 minutes is COMFORTABLE; 15 to less than 30 is POSITIVE MARGIN; zero to less than 15 is TIGHT; below zero is INSUFFICIENT MODELED TIME. These bands are not aviation standards. They describe time under your assumptions, not a numeric success probability or a validated historical-delay prediction.
Minimum connection time vs this calculator
An airline’s official minimum connection time (MCT) can vary by airport, airline, terminals, flight type, interline agreements and itinerary. This calculator does not provide official MCT data. Modeled connection time needed = transfer process + gate buffer + desired extra planning margin. The default extra margin is 15 minutes; it changes this zero-delay planning target, not your current connection margin. Confirm official requirements with your carrier.
Worked examples
Default fixture
Scheduled 90 min − incoming delay 0 min − transfer 45 min − gate buffer 15 min = +30 min margin. COMFORTABLE under assumptions.
Deplaning: 10 min; Walking / airport transport: 15 min; Passport control / immigration: 10 min; Security / re-screening: 10 min; Terminal-transfer overhead: 0 min; Baggage collection: 0 min; Baggage re-check: 0 min; Other transfer obligations: 0 min.
Usable connection time: 75 min. Delay survival: Approximately 30 minutes of incoming delay can be absorbed under these assumptions. Modeled connection time needed: 75 min including 15 min extra planning margin.
15-minute incoming delay
Scheduled 90 min − incoming delay 15 min − transfer 45 min − gate buffer 15 min = +15 min margin. POSITIVE MARGIN under assumptions.
Deplaning: 10 min; Walking / airport transport: 15 min; Passport control / immigration: 10 min; Security / re-screening: 10 min; Terminal-transfer overhead: 0 min; Baggage collection: 0 min; Baggage re-check: 0 min; Other transfer obligations: 0 min.
Usable connection time: 60 min. Delay survival: Approximately 30 minutes of incoming delay can be absorbed under these assumptions. Modeled connection time needed: 75 min including 15 min extra planning margin.
20-minute terminal-transfer overhead
Scheduled 90 min − incoming delay 0 min − transfer 65 min − gate buffer 15 min = +10 min margin. TIGHT under assumptions.
Deplaning: 10 min; Walking / airport transport: 15 min; Passport control / immigration: 10 min; Security / re-screening: 10 min; Terminal-transfer overhead: 20 min; Baggage collection: 0 min; Baggage re-check: 0 min; Other transfer obligations: 0 min.
Usable connection time: 75 min. Delay survival: Approximately 10 minutes of incoming delay can be absorbed under these assumptions. Modeled connection time needed: 95 min including 15 min extra planning margin.
Self-transfer with baggage collection and re-check
Scheduled 90 min − incoming delay 0 min − transfer 80 min − gate buffer 15 min = 5 min short. INSUFFICIENT MODELED TIME under assumptions.
Deplaning: 10 min; Walking / airport transport: 15 min; Passport control / immigration: 10 min; Security / re-screening: 10 min; Terminal-transfer overhead: 0 min; Baggage collection: 20 min; Baggage re-check: 15 min; Other transfer obligations: 0 min.
Usable connection time: 75 min. Delay survival: 5 min short even with no incoming delay Modeled connection time needed: 110 min including 15 min extra planning margin.
35-minute delay: modeled time is insufficient
Scheduled 90 min − incoming delay 35 min − transfer 45 min − gate buffer 15 min = 5 min short. INSUFFICIENT MODELED TIME under assumptions.
Deplaning: 10 min; Walking / airport transport: 15 min; Passport control / immigration: 10 min; Security / re-screening: 10 min; Terminal-transfer overhead: 0 min; Baggage collection: 0 min; Baggage re-check: 0 min; Other transfer obligations: 0 min.
Usable connection time: 40 min. Delay survival: Approximately 30 minutes of incoming delay can be absorbed under these assumptions. Modeled connection time needed: 75 min including 15 min extra planning margin.
Assumptions and limitations
Every process deduction is visible and editable, from 0–240 minutes per component. Inputs use whole minutes and no hidden rounding. Invalid, missing, malformed, non-finite, negative or out-of-range values remove the estimate and disable copy/print. Airport names and locations come from a bundled public-domain OurAirports snapshot of large airports with IATA codes; search is local by code, name or city. There are no airport-specific process timings, live flight APIs, historical delay probabilities, weather or queue feeds. Flight labels are optional plain text for copy and print. Inputs remain in component memory: no storage, accounts, geolocation, saved itineraries, URL persistence or network calculations. Verify gates, check-in, bag-drop deadlines, transfer requirements and airline rules yourself.
This calculator is a planning estimate, not an airline or airport guarantee. Actual transfer time depends on flight operations, gates, queues, immigration, security, baggage handling, airport layout, and airline rules.
FAQ
How much time do I really have during a flight connection?
Start with the scheduled arrival-to-departure interval. Subtract your incoming-delay scenario, gate-arrival buffer and all applicable transfer processes to estimate the remaining margin.
What is usable connection time?
It is scheduled connection minus incoming delay and the gate-arrival buffer, before deducting transfer-process time. It can be negative if the gate target has already passed in your scenario.
How does an incoming delay affect my connection?
Each minute of incoming delay reduces usable time and remaining margin by one minute when other assumptions stay unchanged. It can move the estimate into a tighter planning band.
What does delay survival mean?
It is the zero-delay margin: the modeled incoming delay your connection can absorb before margin reaches zero. A negative value means the schedule is already short under your assumptions.
How do immigration and security affect a connection?
Enter the time for each process if required. They reduce margin by the entered minutes. Neither is inferred automatically from an international connection label.
How does changing terminals affect connection time?
Enter walking and airport transport once. Enable additional terminal-transfer overhead only for time not already included. No airport-specific duration is assigned.
Is a self-transfer riskier than a same-ticket connection?
A self-transfer may have additional obligations and different disruption protections. This calculator models those obligations when you explicitly select and enter them; ticket type alone does not add time.
How do checked bags affect a self-transfer?
If collection and re-check are required, enable them and enter their times. Check bag-drop deadlines with the airline separately, since final gate margin cannot validate an earlier deadline.
Is this the same as an airline’s official minimum connection time?
No. Official MCT rules depend on the itinerary and carrier. This is a user-adjustable time budget and planning estimate, with no official MCT database.
Does this calculator predict whether I will definitely make my flight?
No. It reports deterministic margins and heuristic risk bands under selected assumptions. It has no live or historical flight model, numeric success probability or guarantee.
Sources
Sources support transfer concepts and airport identity only. Preset minutes and risk thresholds are illustrative planning assumptions; sources do not endorse them.