Baltimore (BWI) to Seattle (SEA) flights
Alaska Airlines, Southwest Airlines fly nonstop from Baltimore/Washington International Thurgood Marshall Airport to Seattle-Tacoma International Airport, with about 20 flights a week in July 2026. The 2,335-mile flight takes about 5h 48m gate to gate.
- Distance
- 2,335 mi · 3,758 km
- Flight time
- 5h 48m
- Airlines
- 2
- Seats filled
- 87%
Airlines flying BWI to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 14 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 89,296 | 5h 49m |
| Southwest Airlines | 7 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 17,475 | 5h 42m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
BWI to SEA flight schedule
5 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 7:50am and the last at 6:07pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| AS 786Alaska Airlines | 7:50am | 10:40am | 31 | 79% |
| WN 840Southwest Airlines | 8:05am | 10:45am | 4 | n/a |
| WN 1087Southwest Airlines | 10:20am | 1:00pm | 12 | 42% |
| WN 1694Southwest Airlines | 12:20pm | 3:00pm | 12 | 33% |
| AS 379Alaska Airlines | 6:07pm | 9:00pm | 31 | 62% |
Is BWI to SEA on time?
From September 2025 to August 2026, 67% of 719 flights arrived within 15 minutes of schedule and 0.8% were cancelled. Flights leaving around 7am were the most punctual (76%), those around 6pm the least (63%). Most delay time was caused by air traffic control and airport congestion (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 599 | 68% | 17 min | 0.8% |
| Southwest Airlines | 120 | 60% | 28 min | 0.8% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 7am to 8am | 259 | 76% | |
| 10am to 11am | 24 | 65% | |
| 12pm to 1pm | 16 | 31% | |
| 3pm to 4pm | 27 | 48% | |
| 6pm to 7pm | 137 | 63% | |
| 7pm to 8pm | 216 | 63% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 93 | 14,096 | |
| September 2025 | 90 | 13,118 | |
| October 2025 | 55 | 7,926 | |
| November 2025 | 50 | 6,831 | |
| December 2025 | 60 | 8,902 | |
| January 2026 | 35 | 4,394 | |
| February 2026 | 28 | 3,549 | |
| March 2026 | 31 | 4,777 | |
| April 2026 | 37 | 5,691 | |
| May 2026 | 58 | 9,096 | |
| June 2026 | 87 | 13,859 | |
| July 2026 | 90 | 14,724 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.