Seattle · WA
SEA — Seattle–Tacoma International Airport
One terminal, two satellites, and a light rail line that goes straight downtown
Sea-Tac operates from a single terminal with concourses attached directly and two satellite buildings reached by an underground train. It is compact for the traffic it handles, and most connections are straightforward as a result.
The airport has grown faster than its footprint, which shows at peak times in the security queues rather than in the layout. The International Arrivals Facility, opened in 2022, substantially improved what had been the worst part of the experience.
Terminals and how they connect
Concourses A, B, C and D
Attached directly to the main terminal and reachable on foot. Most domestic flying operates from these.
North and South Satellites
Separate buildings out on the airfield, reached only by the underground train. The South Satellite handles much of the long-haul international departure traffic.
International Arrivals Facility
Opened in 2022, connected to the South Satellite by an elevated walkway. It replaced a badly undersized older facility and made arrivals processing considerably faster.
Getting between them
The underground train links the main terminal with both satellites airside, running frequently and taking only a couple of minutes.
Getting into Seattle
Times below are realistic ranges rather than best cases. Rail journeys keep to a timetable; road journeys do not, and treating the two the same is how people miss flights.
Link light rail
About 40 minutes to downtown
The station is a walk across the parking garage from the terminal, which is longer than it sounds with luggage. Cheap, frequent, and immune to the traffic on I-5.
Taxi or rideshare
25 to 60 minutes
Faster than the train off-peak. Seattle's traffic is heavy and the northbound run into the city at rush hour is unreliable enough that the light rail often wins.
Connecting through SEA
Connections at Sea-Tac are generally simple, because the satellites are linked airside by the underground train and the concourses are walkable. The step that needs time is an international arrival: even with the newer arrivals facility, clearing immigration, collecting bags and re-entering security is a longer process than the gate-to-gate distance implies.
Worth knowing before you fly
The light rail station is further than it looks
It sits across a parking garage from the terminal on an elevated walkway. Allow ten minutes or so from the terminal door, more with heavy bags.
Security queues are the real bottleneck
The layout is efficient but the checkpoints back up badly at peak times, particularly early morning. This is the part of Sea-Tac worth budgeting extra for.
The South Satellite is a train ride away
Long-haul international departures often leave from there. It is only a couple of minutes on the train, but it is not somewhere you can walk to in a hurry.
Terminal assignments, transit timetables and fares all change. Confirm the details that matter to your trip with the airport or transport operator before you travel.
Will you make your connection at SEA?
Most of what a tight connection costs was never about SEA. Border formalities, a bag that is not through-checked and a door that closes before departure are the same at every airport, and they are usually what strands people — so the sum below is real arithmetic even though we hold no transfer times for SEA.
45 minutes to spare
You have 60 minutes after the delay. This connection needs about 15. Enough room for a gate change.
This is the floor, before you walk anywhere. Every minute below holds at any airport, because none of it is a property of SEA — it is border formalities, baggage and a closing gate. Add your terminal change above to finish the sum.
| 15m | Gate closes before departure | typical published gate cutoff |
| 15m | needed in total | |
Arithmetic, not a prediction — we hold no data that would let us put a probability on your flight, so we do not pretend to. The gate cutoff is a typical published figure; confirm your airline's. Your airline's app knows your actual gates, which we do not.
For four hubs we have read the operator's own transfer figures and datestamped them, which lets the arithmetic run without asking you anything: DFW, IAH, MIA and LAX.
If your flight through SEA is cancelled or badly delayed
SEA in the DOT's own numbers
Departures from Seattle as the carriers filed them with the US Department of Transportation for May 2026. This is the figure that decides whether a delay here is anybody's fault but the weather's.
SEA ranks 9th of 41 for departures among the airports we cover, its 18.5% late rate is 3.9 points better than the 22.4% median, and 72.5% of the filed delay minutes were coded as carrier delay or late-arriving aircraft rather than extreme weather or air traffic control, below the 74.6% median here.
- Departures filed
- 11,873
- Over 15 min late
- 18.5%
- Cancelled
- 0.5%
- Carrier delay + late-arriving aircraft
- 72.5%
The last figure is the share of filed delay minutes coded as carrier delay or late-arriving aircraft rather than extreme weather or air traffic control. It sums two BTS fields and is not a BTS field itself, and it establishes no fault: the late-arriving code records that the inbound aircraft was late, not what delayed it. The reasoning, and the objection to it, are set out in the airline accountability index. Summed across reporting carriers only, so a hub carrying a lot of non-reporting regional traffic reads better here than a traveller experiences it.
These are monthly aggregate filing codes. They cannot establish what caused your individual flight, whether it was within the carrier's control, or whether compensation is owed.
The departures from SEA most likely to run late
Every carrier and destination out of Seattle with enough filed departures to measure, worst first. A route missing from this list flies too thinly for a percentage to mean anything, which is a reason to withhold it rather than to soften it.
| Route | Airline | Flights | Late |
|---|---|---|---|
| SEA → ANC | Alaska Airlines | 456 | 20.8% |
What the airlines flying here have committed to in writing
Under 14 CFR § 253.4 a carrier's Conditions of Carriage are incorporated into your ticket, which makes them enforceable terms rather than a customer-service policy. Below is what each carrier with filed departures from SEA commits to when the disruption is theirs. These 4 have contract text we have read ourselves.
American Airlines
Ask for the seatAmerican Airlines' contract commits to their own next available flight and says nothing about who sold the ticket.
Rebooking your delayed / canceled flight. Read from the contract on 2026-07-29. Source
Delta Air Lines
Ask for the seatDelta Air Lines' contract commits to their own next available flight and says nothing about who sold the ticket.
Rule 19.A, Delta's Liability in the Event of Schedule Changes, Delays and Flight Cancellations. Read from the contract on 2026-07-29. Source
United Airlines
We hold no textUnited Airlines' contract page refuses automated requests, so we cannot verify what it currently says and will not paraphrase it.
Not yet transcribed. Source
Southwest Airlines
Ask for the refundSouthwest Airlines' contract only says it may rebook you, so there is no seat to demand — but it names a refund as your remedy.
Section 9.b(1)(i). Read from the contract on 2026-07-29. Source
AS also file departures from SEA. We have not transcribed their Conditions of Carriage, so this page says nothing about what they promise rather than guessing.
Get the exact clause and a script to read themThe federal floor, underneath any contract
Statutory minimums, so no airline's contract and no agency's terms can go below them. They follow your itinerary rather than SEA, so each one is set out in full on its own tool:
How SEA compares with airports of its size
A late-departure rate means little on its own, so these are the airports sitting immediately either side of SEA on the same table. Each figure is the share of departures leaving more than fifteen minutes behind schedule, from the same Department of Transportation filing.
Which airlines run late out of SEA
Departures from SEA as filed with the US Department of Transportation, worst first. Only carriers with at least 300 departures in the month appear, so a carrier missing from this table flies here too thinly to measure fairly rather than perfectly.
| Airline | Departures | Over 15 min late | Carrier delay + late-arriving aircraft |
|---|---|---|---|
| Southwest Airlines | 610 | 29.7% | 80.8% |
| United Airlines | 816 | 24.8% | 43.7% |
| American Airlines | 630 | 22.7% | 86.5% |
| Delta Air Lines | 2,857 | 17% | 79% |
| Alaska Airlines | 6,823 | 16.9% | 71.7% |
The last column is the share of filed delay minutes coded as carrier delay or late-arriving aircraft, as opposed to extreme weather or air traffic control. It records how the minutes were filed, not who was at fault. Each airline guide carries that carrier's national record; the accountability index sets out why late inbound aircraft is grouped with carrier delay, and publishes the whole table as a downloadable file.
Figures cover May 2026, a single reporting month, from the US DOT Bureau of Transportation Statistics On-Time Performance database. Retrieved 2026-07-28. Reporting under 14 CFR part 234 covers domestic US scheduled service only, so no international route appears — including anything to or from Mexico.
Airlines based at SEA
Carriers based here, which usually means more non-stops and more daily frequencies to fall back on if something goes wrong.
Routes through SEA
Flying from Seattle
Stuck on hold?
Talk to an independent agent instead
Airline phone queues and chatbots are where a rebooking stalls. Our agents work these routes daily and will look at what is actually available, walk through the letter you are about to send, and tell you what a desk agent will and will not do. We are not the airline and we do not file claims for you — the templates above are yours to send.
FAQ
SEA — common questions
Terminals, transfers and getting into the city.
How do I get from Sea-Tac to downtown Seattle?
The Link light rail runs from a station connected to the terminal by an elevated walkway and reaches downtown in about forty minutes. It is cheap, frequent and unaffected by traffic. A taxi is faster off-peak at twenty-five minutes or so, but Seattle's rush-hour congestion makes that unreliable, and the train is often the quicker option at those times.
How do the Sea-Tac satellites work?
The North and South Satellites are separate buildings on the airfield, reached from the main terminal by a frequent underground train that takes a couple of minutes. They are connected airside, so you do not leave security. Much of the long-haul international departure traffic uses the South Satellite.
How early should I arrive at Sea-Tac?
The airport layout is efficient but security is the constraint, and the checkpoints queue badly at peak times, especially early morning. Two hours for domestic and three for international is sensible, and worth treating as a floor rather than a target during the summer peak.
Still have a question? We're happy to explain — just call.
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