Free calculator
Airport Time-to-Leave Calculator
Enter your flight details and get the exact time you need to walk out the door.
Flight departure date
Departure time
Flight type
Starting location
Airport
Drive time to airport (minutes)
Enter your starting location and airport above for an automatic estimate.
Security
Bags
Getting to the airport by
Your leave time will appear here
Fill in your flight details and click Calculate.
- •Recommended airport arrival time
- •Estimated drive time based on traffic
- •Exact time to leave your home
Stop calculating this every trip
OnTimer can automatically remind you when it's time to leave for events with locations — flights, meetings, appointments, and more. No more doing the math yourself before every trip.
- ✓Time-to-Leave alerts based on real travel time and traffic
- ✓Connects to Google Calendar and Microsoft Outlook
- ✓Works for flights, meetings, appointments — any event with a location
- ✓Customizable lead time and buffer settings
- ✓iPhone app — alarms that actually get your attention
When should you leave for the airport?
There is no single right answer, but there are a few factors that always matter: whether you're flying domestic or international, how long security will take, whether you're checking a bag, and how long the drive actually is at the time you're leaving.
Most people underestimate at least one of these. They check traffic on Google Maps and assume a 35-minute drive, but forget that they're leaving during rush hour, need to find parking, and still have to get through a bag drop line. The math compounds quickly.
A reliable estimate works backwards from your departure time: subtract the airport arrival buffer first, then subtract travel time. The result is the latest reasonable moment to walk out the door. The calculator above automates that math.
How early should you arrive at the airport?
The TSA and most major airlines recommend the following as a starting point:
- •Domestic flights: arrive 2 hours before departure
- •International flights: arrive 3 hours before departure
These are starting points, not guarantees. A small regional airport with no lines is very different from a major hub on a holiday weekend. TSA PreCheck and Global Entry can meaningfully reduce security time. Checking a bag adds time at the counter and imposes hard cutoffs — most airlines stop accepting checked bags 30 to 45 minutes before departure.
When in doubt, add 15 minutes. Being early at an airport is an inconvenience. Missing your flight is expensive.
Why airport timing is harder than it looks
Most people have a rough sense of how far the airport is. What they underestimate is how many places in the chain can absorb time unexpectedly.
Traffic changes. A drive that takes 30 minutes on Sunday morning takes 55 minutes on a Tuesday at 5 PM. If you pulled your estimate from earlier in the day, you may already be behind before you leave.
Parking adds time in ways that are easy to overlook. Finding a spot, waiting for the shuttle, riding to the terminal — economy parking at a major airport can easily absorb 20 to 30 minutes that most people do not budget for.
Bag check has a hard cutoff. Miss it and you lose your checked bag for the trip or miss the flight entirely. That cutoff does not care how close you are to the airport.
Security lines are unpredictable. TSA PreCheck helps. But even with PreCheck, a busy checkpoint or a slow line can add real minutes to your buffer.
The biggest factor is overconfidence. Most people who miss flights were not planning to cut it close. They just ran through the math too optimistically. A small buffer in every step of the chain is cheap insurance.
A better way to avoid missing flights
Calculating your leave time manually every trip works — until it doesn't. You forget, you rush, you underestimate. The math is not hard. The problem is remembering to do it, at the right moment, with the right inputs.
OnTimer is an iPhone app designed to solve this automatically. For any calendar event with a location, it calculates when you need to leave and alerts you at the right time — based on travel time and traffic, not just a fixed reminder.
The same feature works for meetings, appointments, pickups, and anything else in your calendar with a location. You stop having to think about it. OnTimer handles the timing.
Frequently asked questions
When should I leave for the airport?+
It depends on your flight type, security setup, bags, and how you're getting there. A common rule: domestic flights need you at the airport 2 hours early, international 3 hours. Add your drive time and any parking buffer on top of that. Use the calculator above to get a specific leave time.
How early should I get to the airport for a domestic flight?+
Most airlines and TSA recommend arriving 2 hours before a domestic flight. If you have TSA PreCheck or Global Entry, you may be able to shave 15 minutes off that. If you're checking a bag or driving to park, add extra time.
How early should I get to the airport for an international flight?+
3 hours before departure is the standard recommendation for international flights. Customs pre-clearance, longer security lines, and stricter bag drop cutoffs all add time. If traveling during peak hours or from a large hub, giving yourself more time is rarely the wrong call.
Does traffic change when I should leave for the airport?+
Yes, significantly. A 30-minute drive during off-peak hours can become 60+ minutes during rush hour near major airports. Always estimate your drive time based on when you'll actually be leaving, not a generic average.
How much extra time should I allow for parking?+
Add at least 15–20 minutes for airport parking. This accounts for finding a spot, waiting for a shuttle, and the ride to the terminal. Economy lots are farther away and can easily add 30 minutes round-trip.
Should I arrive earlier if I'm checking a bag?+
Yes. Most airlines close bag check 30–45 minutes before departure. If you're running late and can't check your bag, you may be denied boarding. Add 15–20 minutes to your buffer if you're checking luggage.
Can OnTimer remind me when to leave for the airport?+
OnTimer is built for calendar events with locations — like flights, meetings, and appointments. For any event with an address, OnTimer's Time-to-Leave feature can alert you when it's time to head out, based on travel time and traffic. Time-to-Leave is a Pro feature.
Never cut it close again
Download OnTimer and get automatic leave-time reminders for flights, meetings, and every event in your calendar.