Checkpoint decision guide
Which SEA checkpoint should you use?
Choose by screening eligibility and current operations—not only by the gate printed on the boarding pass.
Checkpoints
Six
All gates
Reachable from each
24 hours
Checkpoint 4 listed
Operations
Can change daily
The decision
What the facts mean together
Every SEA checkpoint reaches every gate. Start with the lane you are eligible to use, confirm that it is open, compare current waits, and then account for the walk or underground train after screening.
South-side starting points
The current Port table places Checkpoints 1, 2, and 3 closest to A and S gates. Checkpoint 1 offers general, PreCheck, and CLEAR lanes; Checkpoint 2 lists general screening and the service-member lane; Checkpoint 3 lists general, PreCheck, Touchless ID for participating airlines, and participating-airline premium lanes.
Central and north-side starting points
Checkpoint 4 is closest to Central Terminal, B, and C gates and is currently listed as open 24 hours, with general, premium, family, Spot Saver, and Visitor Pass lanes. Checkpoints 5 and 6 serve the north side; Checkpoint 5 is PreCheck, while Checkpoint 6 lists general, premium, PreCheck, Touchless ID, and CLEAR options.
The gate is not the whole decision
A shorter eligible line can be worth a longer post-security walk. N and S gates require the SEA Underground; A, B, C, and D can be reached through the connected terminal, with trains available as another option.
Open SEA's interactive map →Travel-day checklist
Keep the decision current
- 1Confirm the boarding-pass screening designation
- 2Check today's checkpoint hours and estimated waits
- 3Use in-terminal signs when they differ from an article
- 4Allow time to reach the gate after screening
Connect the signals
How one airport detail changes the rest of the plan
The useful answer is rarely one isolated fact. These are the dependencies that most often change the decision.
Your boarding pass says PreCheck
Only checkpoints offering PreCheck preserve that screening path; the closest general lane may be the wrong choice.
Compare Checkpoints 1, 3, 5, and 6 before joining a line.
Your gate is N or S
The checkpoint decision and the gate journey are separate. Those concourses require an underground train after screening.
Budget post-security train and walking time even if the checkpoint line is short.
Checkpoint signs differ from this guide
Hours and lane types are adjusted with daily TSA operations.
Follow the airport's digital signs and staff; they are the travel-day authority.
Common planning mistakes
When the simple answer breaks down
- A shorter line that does not offer the screening benefit on your boarding pass
- Treating the gate's nearest checkpoint as mandatory
- Forgetting the train or walking time after security
Connect the plan
Check the flight, then reserve the right ride.
Airport details can change. Confirm the flight and current airport information before choosing the pickup time.
Official information
Last checked August 29, 2026. Airport services and hours can change, so use these official links to confirm details for your travel day.
- Port of Seattle: Security Screening and Checkpoints
Official airport guidance
- Port of Seattle: Live Estimated Checkpoint Wait Times
Official airport guidance
- Port of Seattle: All Aboard the SEA Underground
Official airport guidance