Free airport departure planner · No sign-up

Find out exactly when to leave for the airport

Enter your flight's departure time, starting point and airport. This free calculator uses traffic, security, bags, parking and terminal access to give you a specific leave time.

Your Trip

Flight date

Select a date

Flight departs at

Flight type

Recommended airport arrival: 2 hr 15 min before the flight (135 min).

Route

Leaving from

Enter your starting location or use your current location so we can estimate the trip.

Departure airport

Add your airport to calculate.

What we use

✓TSA security time

✓Parking or curb access

✓Domestic timing

✓Expected traffic

This calculator is for realistic departure planning. For a fun take on risky airport timing, see the Airport Theory Calculator (experimental).

The short answer

Calculate what time to leave for your flight using your starting point, flight time, expected travel conditions, security planning, bags, parking and terminal access—not just a generic 2-hour or 3-hour arrival rule.

A common planning baseline is arriving 2 hours before domestic flights and 3 hours before international flights. The calculator works backward from your actual trip to estimate when you should leave.

Those airport arrival windows exist for a reason: security lines, bag drop cutoffs, and terminal walking time all absorb the margin most people assume they have. The calculator above applies that math to your specific route and departure time.

What the standard rule doesn't account for: whether you're parking (add 15–20 minutes), checking a bag (add another 15 minutes), or traveling during a peak traffic window. Each of those can individually erase the buffer you thought you had.

When Should You Leave for the Airport Based on Your Flight Time?

Start with the departure time on your ticket, subtract the appropriate airport-arrival window, then subtract your route time and any parking or terminal buffer. Because each input changes the result, two travelers on the same flight may need to leave at different times. The calculator applies those inputs to your trip instead of presenting one example time as your answer.

Flight time affects how much traffic you'll hit. An early morning flight sounds easy until you realize you're driving to the airport at 5 AM — which is actually light traffic and often faster than you expect. A noon flight means leaving during morning rush, which can add 20–40 minutes to a drive that looks short on the map.

Evening flights are the most commonly misjudged. Traffic has thinned, so the drive feels easy — but airports are busiest in the late afternoon and security lines reflect that. The drive is shorter; the airport wait often isn't.

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 and heavily influenced by TSA wait times, staffing, and checkpoint volume. Even with TSA PreCheck, a busy period can add meaningful delay.

The biggest factor is overconfidence. Most people who miss flights were not planning to cut it close. They just ran through the departure timing math too optimistically. A small buffer in every step of the chain is cheap insurance.

The execution gap at the airport

Most missed flights don't happen because people forgot about the flight. They happen in the final execution window — knowing you need to leave and actually leaving. This is the Last 5 Minutes Problem. Knowing the right departure time is step one. Having something that actually interrupts you and forces you out the door at that moment is step two.

The Last 5 Minutes Problem: why knowing isn't enough →Why notifications fail at the worst moment →

Know when to leave. Then make sure you do.

Save the answer to your calendar first. OnTimer can then turn calendar events into automatic Time To Leave alarms that are harder to miss when it is actually time to go.

✓Uses your existing Google, Apple, or Microsoft calendar
✓Creates Time To Leave alarms automatically
✓Persistent alarms require acknowledgement
✓Works for flights, meetings, appointments, and other location-based events

Download on the App Store

Frequently asked questions

When should I leave for the airport?+

It depends on your flight type, route, security setup, bags, parking or transit, and terminal access. A common planning baseline is to arrive 2 hours before a domestic flight or 3 hours before an international flight, then work backward through every step of your trip. Use the calculator above for a leave time based on your circumstances.

How early should I get to the airport for a domestic flight?+

Two hours before departure is a common domestic-flight planning baseline, but your airline's check-in and bag-drop deadlines take priority. Parking, terminal transfers, peak travel periods, and checked bags can require more time.

How early should I get to the airport for an international flight?+

Three hours before departure is a common international-flight planning baseline. Airline check-in and bag-drop deadlines, document checks, security, border procedures, and terminal transfers may require an earlier arrival.

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.

Does this calculator use current airport security wait times?+

For supported U.S. airports, selecting an airport shows a current third-party airport-wide estimate from TSAWaitTimes.com. The calculator uses current evidence when it is relevant and a time-of-day planning estimate for future trips, together with the buffer shown in your result. These are planning estimates, not official TSA checkpoint measurements, and conditions can change.

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.

Find out exactly when to leave for your airport

Choose your airport for a personalized answer with local terminal, transfer, road, rail and airport-processing context.

Related timing tools

Never cut it close again

Download OnTimer and get automatic leave-time reminders for flights, meetings, and every event in your calendar.

Download on the App Store