Southwest · SEA
What gates does Southwest use at Seattle Airport (SEA)?
Southwest uses 11 gates at Seattle Airport (SEA), mainly in Concourse B, with about 24 departures a day (Oct 1–21, 2026). It is the main airline at 3 of them.
Based on 844 Southwest flights at SEA, Oct 1–21, 2026 (full days)
How Southwest compares at SEA
- 5th of the 34 airlines with regular flights at SEA by departures: 4% of them (24 departures a day of about 587 a day).
- 5% of the seats leaving SEA: about 3,850 a day, 163 per departure.
- 2.8 turns a day at each gate it turns planes at, 37% fewer than the airport’s 4.5.
- Median turn at the gate: 56 min, 19 min shorter than the airport median (75 min).
- At SEA, Southwest’s 24 departures a day compare with American’s 26 and United’s 30. Southwest has 3 gates of its own; American 6; United 5.
Where Southwest flies nonstop from SEA
11 nonstop destinations. Nonstop routes seen Oct 1–21, 2026; a few days of data can miss weekly or seasonal routes.
| Destination | Flights | Other airlines on this route |
|---|---|---|
| DenverDEN | 3-4/day | United (5-6/day), Alaska (4-5/day), Delta (3/day), Frontier (1/day), American (under 1/week) |
| SacramentoSMF | 3/day | Delta (4-5/day), Alaska (4-5/day) |
| PhoenixPHX | 3/day | Alaska (7-8/day), Delta (5/day), American (3-4/day) |
| OaklandOAK | 2-3/day | Alaska (3/day) |
| San JoseSJC | 2-3/day | Alaska (5-6/day), Delta (4-5/day), United (under 1/week) |
| Las VegasLAS | 2-3/day | Alaska (8-9/day), Delta (4-5/day), Frontier (4-5/week), United (under 1/week), American (under 1/week) |
| San DiegoSAN | 2/day | Alaska (8-9/day), Delta (4-5/day) |
| Chicago MidwayMDW | 1-2/day | none seen |
| AustinAUS | 1/day | Alaska (3/day), Delta (2-3/day) |
| Dallas Love FieldDAL | 1/day | none seen |
| Long BeachLGB | 5-6/week | Alaska (2/day) |
When Southwest flies at SEA
- First departure of the day usually around 5:25 am, the last around 12:40 am (after midnight).
- Busiest hour: 11:00 am–12:00 pm, with about 4 of its arrivals and departures.
- About 2 of its aircraft spend the night at SEA (arrive in the evening, leave the next morning).
Southwest’s aircraft at SEA
| Aircraft | Departures | Seats each |
|---|---|---|
| 737 MAX 8 | 11/day | 175 |
| 737-700 | 8-9/day | 143 |
| 737-800 | 4/day | 175 |
| 737 | under 1/week | not listed |
About 3,850 seats leave SEA on Southwest each day. Of the gates it holds, 3 have taken a narrow-body. Seats are capacity from each airline’s seat map per aircraft type, not passengers.
Southwest’s gates at SEA
Terminal 1, Concourse B B10
Concourse B B12, B14
Held = the airline flying the gate most (regional partners count as their brand).
Gates it shares
| Gate | Who holds it | Other airlines there |
|---|---|---|
| DH1 | Too few flights yet | – |
| S1B | Common use | Frontier, WestJet, American, Air Canada |
| S2 | Common use | Delta, American, Alaska, Volaris |
| S3A | Common use | American, Frontier, WestJet, JetBlue |
| S4A | Common use | JetBlue, Frontier, American, WestJet |
| S5 | Common use | Delta, Air Canada, United, Aeroméxico |
| S9B | Too few flights yet | Frontier, American |
| S10A | Too few flights yet | JetBlue |
About this data
Based on 16 full days of flights at SEA, Oct 1–21, 2026. Gates of its own are the gates where Southwest flies the most (regional partners count as their brand). Every one of its departures has a seat count.
Southwest at SEA: questions
What terminal is Southwest at Seattle Airport (SEA)?
Southwest flies from Concourse B at Seattle Airport (SEA).
What gates does Southwest use at SEA?
Southwest has 3 gates at SEA (the airline flying each one most): B10, B12 and B14. It used 11 gates in all over Oct 1–21, 2026.
How many flights a day does Southwest have from SEA?
About 24 departures a day and 3,850 seats, averaged over Oct 1–21, 2026.
Where does Southwest fly nonstop from SEA?
Southwest flies nonstop to 11 cities from SEA, the most often to Denver, Sacramento, Phoenix, San Jose, Oakland and Las Vegas. Routes seen Oct 1–21, 2026.
When is Southwest’s first flight out of SEA?
Usually around 5:25 am; the last leaves around 12:40 am (after midnight).
Does Southwest share gates at SEA?
Yes: 8 gates it uses are shared or used most by another airline, e.g. gate DH1.
Other airlines at SEA
All of SEA’s gates by airline · Southwest at every airport we map · Nonstop routes from SEA