What time should I leave for the airport?
Start with the flight departure time and work backward through gate-ready margin, terminal movement, security, bags or document processing, airport access and your own journey time. That is why the answer can move even when the flight time does not.
How the departure calculation works
Start with scheduled departure. Work backward to the time you want to be ready at the gate, then allow for terminal movement, security, checked-bag or international processing, airport access and your road or rail journey. Contingency is added separately so expected process time does not get mixed with extra margin.
Why FlyBuffer gives three leave times
Cautious protects more strongly against variability. Recommended balances the inputs you selected. Latest planned uses less contingency and is more vulnerable to disruption; it is not a guaranteed safe cutoff.
Domestic vs international flights
International trips can require additional document processing and a larger gate-ready margin. The exact requirement depends on airline, route and airport, so airline-specific check-in and boarding rules always take priority.
Checked bags and airline cutoffs
A checked bag can move the plan earlier because bag drop takes time and many airlines stop accepting bags before departure. When you know the airline cutoff, enter it so the plan cannot place terminal arrival too late.
Parking, rideshare, rental cars and public transport
Reaching airport property is not the same as reaching the terminal. Drop-off usually has fewer steps; on-site parking adds a walk or transfer; off-site parking and rental-car return can add a shuttle; public transport may leave you at a station that still requires terminal movement.
How security affects the plan
Security is shown as a range because conditions change. The planner can use an airport-specific estimate or your own current checkpoint value. Changing the security input should move only the security block, not silently inflate the rest of the trip.
TSA PreCheck
PreCheck can reduce checkpoint friction, but lane availability and wait conditions vary. FlyBuffer does not subtract an arbitrary fixed amount. If you have a better current PreCheck estimate, use that value directly.
Airport familiarity, children and mobility assistance
An unfamiliar airport can require more navigation time. Traveling with children or mobility assistance can change how quickly your group moves through parking, terminal entry and the gate area. These are planning inputs, not judgments about the traveler.
How the planning profile changes the result
The planning profile does not change your flight, journey or airport facts. It changes how much uncertainty you want the schedule to absorb. Lean planning keeps the extra margin smaller, Balanced is the default trade-off, and Cautious adds more protection against variation in travel, airport access and security.
When to use a security estimate override
If a reliable airport or checkpoint source gives you a more current security estimate than the airport-wide FlyBuffer range, enter that value directly. The rest of the calculation should stay the same, which makes it easy to see how much a security update actually moves your leave time.
When the airline becomes the controlling constraint
Some trips are driven less by the security estimate and more by an airline requirement. A checked-bag cutoff, document-check deadline or boarding instruction can force an earlier terminal arrival. When that happens, the planner should show that the airline constraint—not a generic airport buffer—is what moved the recommendation.
Three example trips
Domestic · carry-on · curb drop-off
The airport-side process is relatively simple. Security and gate-ready margin may dominate after the road journey.
International · checked bag · rideshare
Bag processing, document requirements and a larger gate-ready margin can move the plan earlier even without parking.
Domestic · off-site parking · unfamiliar hub
The parking transfer and extra terminal-navigation allowance can matter as much as the checkpoint range.
Frequently asked questions
There is no single number. Travel time, airport access, security, bags and airport scale can all change the answer.
International trips often need additional document and gate-ready time. Airline-specific rules take priority.
It is a useful rule of thumb, not a personalized calculation.
Often yes, especially when your airline has a bag-drop cutoff.
Yes. Include the time between reaching airport property and reaching the terminal.
Not by a fixed amount. Use a checkpoint-specific estimate when you have one.
Follow the airline deadline. Airline rules override a general planning estimate.
Yes. Update travel time or security when you have better current information.