Weekday Domestic Flight
7:00 PM departure, 45 min transit, 90 min airport buffer. Leave by 5:45 PM. Add 20 minutes if evening congestion is common on your route.
Short Answer
If you ask what time should I leave for the airport, start by targeting your airport arrival time first: around 90 minutes before domestic departures and 180 minutes before international departures. Then subtract your transit time and add risk margin for traffic.
Simple Rules for "What Time to Leave for Airport" Searches
- Domestic flights: arrival target = departure minus 90 minutes
- International flights: arrival target = departure minus 180 minutes
- Transit adjustment: subtract realistic route time, not map best-case time
- Risk adjustment: add 20 to 60 minutes for weather, events, and peak-hour traffic
This is why the phrases what time should I get to the airport and what time should I leave for the airport calculator usually lead to the same planning workflow.
Scenario Examples
Early International Flight
9:30 AM departure, 65 min transit, 180 min airport buffer. Leave by 5:25 AM. Add 30 minutes if parking shuttle lines are usually long.
Train Transfer Day
5:40 PM train, 35 min transit, 45 min station buffer. Leave by 4:20 PM. Add 15 minutes if the station is unfamiliar.