Leave SEA.

Enter your flight details and we'll calculate exactly when you need to walk out the door.

We'll look up your scheduled departure time, gate, and destination automatically.

Leave home by

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Your journey, step by step

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Total minutes
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Travel time
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At airport

⚠ Risk factors

Calculate your departure time to see relevant risk factors.

Estimates combine live flight status, traffic, transit, and weather data with historical SEA patterns for TSA wait times and airport congestion.
All wait times, travel estimates, and recommendations on this site are predictions only and are not guaranteed to be accurate, current, or complete. Always verify with your airline and allow extra time.
Not affiliated with the Port of Seattle, SEA Airport, or TSA. Privacy Policy · Terms of Use · Contact / Feedback

How Leave SEA works

Leave SEA works backward from your flight's scheduled departure time. It starts by resolving the actual gate, aircraft type, and destination for your specific flight number, then subtracts live, real data for every step between your front door and your seat: driving time from live traffic conditions (or real transit schedules if you're taking the bus or light rail), a bag-check counter wait scaled to how busy that hour typically is, a walk-to-checkpoint estimate that accounts for SEA's underground train if your gate is in the N or S satellite concourses, and a security-line estimate that blends today's live checkpoint wait times with historical averages for that hour — scaled again by whichever lane you're using, whether that's PreCheck, CLEAR, or standard screening.

Most departure-time calculators use a single flat buffer — "arrive two hours early," regardless of the day, hour, or actual airport conditions. Leave SEA instead pulls live TSA checkpoint wait times directly from Port of Seattle's own public systems, real-time traffic, weather forecasts, and a running list of holidays, school closures, road construction, and major Seattle-area events that could realistically affect your specific commute — then tells you exactly what that adds up to for your flight.

Frequently asked questions

Is Leave SEA free to use?
Yes. There's no account, no sign-up, and no cost. Leave SEA doesn't persist your flight details, address, or any other personal information after you close the page.
How accurate are the estimates?
They're built from live, real data sources — actual TSA checkpoint wait times, live traffic conditions, and real flight status — but they're still predictions, not guarantees. Airport conditions can change quickly, so build in some personal buffer and check with your airline directly if your flight is time-sensitive.
Does this work for international flights out of SEA?
Yes — enter your flight number as usual. Checking bags for an international flight adds the extra international counter-wait estimate automatically.
What if I don't know my flight number?
Use the "Look up flight number" link under the Flight Number field to search by destination and airline instead, or switch to "Enter Time Manually" if you already know your scheduled departure time.
Can I use this to plan a pickup instead of a departure?
Yes — Pickup SEA is the companion calculator for figuring out when to leave home to meet someone whose flight is landing at SEA.
Is Leave SEA affiliated with the Port of Seattle or TSA?
No. Leave SEA is an independent, unaffiliated tool built to make live public data — TSA wait times, flight schedules, traffic — easier to act on in one place.