How early should I get to SEA?
Seattle-Tacoma International Airport, Seattle, WA · Checked Oct 14, 2026
The short answer
Arrive two hours before your departure time
Arrive three hours before your departure time
Those are blanket rules. Your real number depends on your terminal, the time of day, traffic from your door, and whether you have PreCheck or a bag. Leave By works out your exact leave time.
Source: flysea.org
Security lines at SEA
SEA says the new Checkpoint 1 and redesigned Checkpoint 6 (opened 2025) have lines moving quickly, with over 94% of travelers getting through in 20 minutes or less. More than a third of daily passengers arrive before 9 a.m.
Busiest times: Before 9:00 a.m., 2:00-5:00 p.m., 9:00-11:00 p.m..
Nationally, TSA checkpoints are busiest from 5 to 7 AM local time. See TSA's hourly numbers and the busiest days to fly.
TSA PreCheck: PreCheck is offered at Checkpoints 1, 2, 3, 5 and 6, but not 4. Checkpoint 3 PreCheck runs only 4 a.m.-8 p.m., Checkpoint 2 closes at 4 p.m., and Checkpoints 1 and 5 close at 8 p.m. After 10 p.m. only Checkpoints 3 (to 11:30 p.m.) and 4 (24 hours, no PreCheck) are listed as open. SEA's wait-times page lists slightly different screening types per checkpoint than its security page; SEA says hours and types are approximate, so check terminal signage.
CLEAR: Available at this airport (see terminals below for which checkpoints).
Touchless ID: TSA PreCheck Touchless ID is offered at Checkpoint 3 (4 a.m.-8 p.m.) and Checkpoint 6 for participating airlines only. Alaska announced in June 2025 that it was bringing Touchless ID to SEA (Mileage Plan members 18+, opt in with a KTN and passport), and SEA appears on an April 2026 list of 65 Touchless ID airports.
Terminals and checkpoints
Main Terminal (Concourses A, B, C, D)
Alaska, Delta, American, Southwest, United, Frontier, WestJet
- SEA is a single terminal and every checkpoint leads to all gates
- Alaska uses C, D and N concourses; Delta uses A and B; American uses D; Southwest, United and Frontier use B; WestJet uses A and B
- The new C Concourse Expansion opened June 2026, with dining, retail, an airfield lookout and a 41,000+ sq ft Alaska Lounge
- D Annex (across from Gate D5, Gates D21-26) is the bus-boarding hub for flights parked away from gates
N Concourse (satellite)
Alaska
- Reached after screening by the SEA Underground train; buses replace trains during maintenance or outages
S Concourse (satellite, main international concourse)
Hawaiian, JetBlue, British Airways, Lufthansa, Emirates, Korean Air, Japan Airlines, ANA, Air France, Air Canada, Condor, Icelandair, EVA Air, Cathay Pacific
- Reached after screening by the SEA Underground train; Checkpoints 1-3 are closest
- S Concourse Evolution renovation is approved and in design; the concourse stays open during multi-phase work
Between terminals: Everything is one terminal. Concourses A-D connect by walkway, and the SEA Underground train runs to the N and S satellite concourses. Buses connect the satellites during train maintenance, including intermittent overnight closures through 2027.
Terminals are connected after security, so you can walk between them without re-screening.
Getting to SEA
Rideshare and taxi: Uber and Lyft drop off at the terminal on the airport drives; at peak times drivers may use the Arrivals drive to avoid traffic. Departures drives are often congested 6-8 a.m. Pickups are on the 3rd floor of the parking garage (stalls 1-34).
Transit: Sound Transit Link light rail takes about 38 minutes from downtown Seattle. The Airport/SeaTac station connects to the terminal via the parking garage and 4th-floor skybridges, and a free Train-to-Plane shuttle runs between the station and the garage 5 a.m.-midnight.
Driving and parking: Arrive via the Airport Expressway; parking on its shoulders is illegal. The on-site garage has more than 11,000 spaces: drive-up General Parking on Levels 1-3, 6-8 and Level 5 Rows A-M, and Reserved Parking on Level 4 and Level 5 Rows N-W, bookable up to 120 days ahead. The free Cell Phone Lot is off the S. 170th St exit.
Construction and changes in 2026
- Roadway Improvements (in progress) are widening the southbound Northern Airport Expressway from 4 to 6 lanes from S. 170th St to the curbsides and Main Garage. SEA listed main-work completion as Q2 2026 but still shows the project in progress.
- SEA Underground train controls replacement brings intermittent overnight closures, with buses taking passengers to the N and S Concourses; completion estimated Q3 2027
- Parking garage elevator refurbishment causes intermittent closures; as of an Aug 14, 2026 update, all yellow elevators were out of service
- SEA Spot Saver, the free security-appointment program, ends November 30, 2026
- S Concourse Evolution (international concourse renovation) is approved and in design
Checking a bag
Alaska: check-in and bag drop typically close 40 minutes before departure, earlier for international. Delta: bags at least 45 min before departure, check-in at least 30 min without bags, at the gate 15 min before. Southwest: bags 45 min, check-in 30 min (domestic).
SEA tips first-timers miss
- In the morning, get dropped off on the lower Arrivals level to skip the congested Departures drive (SEA's own 'think opposite' advice)
- Checkpoint 4 is the only 24-hour checkpoint but has no PreCheck lane. Late-night PreCheck travelers should know most PreCheck lanes close at 8 p.m.
- Book SEA Spot Saver at Checkpoint 4 for a free reserved screening time (4 a.m.-10 p.m., 60-240 min before departure) until it ends Nov 30, 2026
- Flights at N or S gates need extra minutes for the SEA Underground train, or a bus if the train is down
- During peaks your flight may board by bus from the D Annex (Gates D21-26, across from D5) when gates are full
- Reserved garage parking (Level 4 and Level 5 Rows N-W) guarantees a space; drive-up parking can mean extra time hunting for a stall in busy periods
Leaving for SEA?
Pick your flight and where you're starting. Leave By checks live traffic, security lines and your terminal, and tells you the minute to walk out the door.
Free. No account.
Questions travelers ask
How early should I get to Sea-Tac?
The Port of Seattle advises arriving two hours before a domestic flight and three hours before an international flight. More than a third of the day's passengers arrive before 9 a.m., so early-morning departures are the busiest.
Which Sea-Tac security checkpoint should I use?
Any checkpoint reaches all gates. Checkpoints 1-3 are closest to A and S gates, Checkpoint 4 to B and C gates, and Checkpoints 5-6 to C, D and N gates. PreCheck is not offered at Checkpoint 4.
How long is the Link light rail ride from downtown Seattle to Sea-Tac?
The Port of Seattle says it is about a 38-minute ride. From the Airport/SeaTac station, walk through the parking garage to the skybridges, or take the free Train-to-Plane shuttle (5 a.m.-midnight).
Sources
- SEA - Security Screening and Checkpoints
- SEA - Predicted Checkpoint Wait Times / When to arrive
- SEA - SEA Spot Saver (ending Nov 30, 2026)
- SEA - How to Fly through Security at SEA Airport (updated Oct 2025)
- SEA - Airlines and Destinations
- SEA - Travel Tips for SEA Airport
- SEA - Ground Transportation
- SEA - Ride App Pick-Up
- SEA - Public Transit: Link Light Rail
- SEA - Parking at SEA Airport
- SEA - Traffic and Roadway Construction Alerts
- SEA - Construction Impacts (updated Aug 14, 2026)
- SEA - Roadway Improvements project
- SEA - SEA Gateway Project
- SEA - C Concourse Expansion (opened June 2026)
- SEA - S Concourse Evolution
- SEA - SEA Underground Controls Replacement
- SEA - Why Am I Taking a Bus to Get to my Plane?
- The Bulkhead Seat - TSA Expands Touchless ID Screening to 65 US Airports (Apr 27, 2026)
- Alaska Airlines News - What's happening behind the scenes before your flight
- Delta - U.S. Domestic Check-In Requirements
- Southwest - When to Arrive for Your Flight
- The Bulkhead Seat - Alaska is bringing TSA PreCheck Touchless ID to LAX, PDX and SEA (Jun 22, 2025)
Airport conditions change. Always follow your airline's check-in and bag-drop deadlines.