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Airports / Washington / SEA

Seattle (SEA) TSA wait times

Seattle–Tacoma International Airport schedules 475 departures on an average day, and pushes up to 36 of them in a single hour. The checkpoint feels that: expect roughly 20 to 35 minutes in the standard lanes at the Thursday 8 am peak, and closer to 8 minutes at Saturday 10 pm.

Security now Modelled

16min

Down 8 min since 6 am.

Standard line. It usually runs 10 to 25 minutes at this hour on a Monday.

The worst it gets at SEA is about 26 min, Thursday at 8 am. The quietest useful hour is Saturday at 10 pm, about 8 min.

Tell us your flight below and we will work out when to leave.

A typical Monday.

That 16 is the standard line

  • Standard 16min
    the default
  • PreCheck 6min
    saves 10
  • CLEAR 4min
    saves 12

What each line is

When should you leave?

Worked from the wait actually running at this checkpoint at the hour you will be here, not a fixed buffer.

Example. For a 6:00 PM domestic flight today, leave home about 4:34 PM. That is 30 min driving, 14 min to park, about 15 min at security when you reach it around 5:18 PM, 12 min to walk to the gate and 15 min spare before boarding: 86 minutes door to gate. Change any of it below for your own flight.

Door to terminal kerb, before traffic. We add the traffic for the hour you would actually be driving.

Enter your flight details above to work out your exact departure time.

Which security line?

The three ways through the checkpoint at this airport, what each is running right now, and what the faster ones save you.

  • Standard 16min

    Open to everyone. Usually 10 to 25.

  • PreCheck 6min

    Saves 10 min. TSA pre-approved travellers. Usually 5 to 10.

  • CLEAR 4min

    Saves 12 min. Biometric check, then to the front. Usually 5 to 10.

PreCheck and CLEAR are separate programmes. PreCheck is a lighter screening you qualify for; CLEAR verifies who you are and walks you to the front of whichever line you are already entitled to use.

Is PreCheck worth it for you? ›

Another airport nearby?

Airports within driving distance of SEA, and the worst each one gets in its own busiest hour.

Every US airport on one board ›

Airlines at SEA

Which airline you are flying decides your terminal and checkpoint. This is the share of SEA's departures each one runs, from the published schedule.

  • Alaska 47%
  • Delta 19%
  • SkyWest regional 18%
  • United 6%
  • Southwest 5%
  • American 4%
  • Frontier 1%
  • Hawaiian 1%

Regional carriers (SkyWest, Envoy, PSA, Republic) fly these routes under the mainline brands, so a SkyWest flight shows on your ticket as Delta, United, American or Alaska.

For the terminal your gate is in, check your airline's boarding pass or the airport's official map. We do not model terminal-by-terminal waits yet, and we will not guess at them.

Is another time better?

The checkpoint is busiest around 8 am today, at about 26 min. Fill in your flight above to see where your own trip lands.

midnight6 amnoon 6 pm11 pm

The dark bar is now.

Busiest hours at SEA

Every block is one hour of one weekday at SEA, shaded by how much of the airport's own peak load the checkpoint is carrying. This is the measured half of the page: it comes from the published flight schedule, not from an estimate.

Day 12a 1a 2a 3a 4a 5a 6a 7a 8a 9a 10a 11a 12p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p
Sun
Mon
Tue
Wed
Thu
Fri
Sat

Darker means a heavier checkpoint load. Built from 44,164 scheduled departures from SEA across three months of federal on-time records.

Hour by hour, Monday

Expected standard-lane wait at SEA on a typical Monday. PreCheck and CLEAR run shorter.
HourDepartures Standard PreCheck
2 am 1 5–10 min 3 min
3 am 5 5–10 min 3 min
4 am 13 5–15 min 3 min
5 am 24 10–25 min 5 min
6 am 34 15–35 min 9 min
7 am 35 20–35 min 9 min
8 am 35 20–35 min 9 min
9 am 34 15–35 min 9 min
10 am 34 15–35 min 8 min
11 am 25 10–25 min 6 min
noon 24 10–25 min 6 min
1 pm 23 10–20 min 5 min
2 pm 26 10–25 min 6 min
3 pm 24 10–25 min 6 min
4 pm 27 15–25 min 6 min
5 pm 23 10–20 min 5 min
6 pm 23 10–20 min 5 min
7 pm 21 10–20 min 5 min
8 pm 23 10–20 min 5 min
9 pm 18 10–20 min 4 min
10 pm 13 5–15 min 3 min
11 pm 4 5–10 min 3 min

Questions people ask about SEA

How early should I get to SEA?

For a domestic flight out of Seattle, plan to be inside the terminal about an hour before departure, and about an hour and a half for an international one. That covers a 20 to 35 minute checkpoint queue at the Thursday peak plus the walk to the gate. Outside the peak you can safely trim it; the calculator above works it out from your actual departure time.

What is the busiest time at SEA security?

Thursday around 8 am, when 36 departures' worth of passengers are converging on the checkpoint at once. The calmest hour with real traffic is Saturday at 10 pm, at roughly 8 minutes.

Is TSA PreCheck worth it at SEA?

At the Thursday peak it turns a 20 to 35 minute queue into something closer to 9 minutes. Over a five year membership that is worth it if you fly more than about three round trips a year through an airport this busy. The trusted traveller calculator prices it against your own flying.

When does security open at SEA?

Seattle–Tacoma International Airport does not publish checkpoint opening hours in any national feed, so we will not invent them. What the schedule does show is that the first departures leave around 2 am, and checkpoints generally open about two hours before the first flight of the day.

Flight schedule data: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, May 2026, July 2025 and December 2025. Wait minutes are modelled, not measured. Here is exactly how. Page rebuilt 24 August 2026.