Washington (DCA) to Seattle (SEA) flights
Alaska Airlines, Delta Air Lines fly nonstop from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport, with about 20 flights a week in July 2026. The 2,329-mile flight takes about 5h 55m gate to gate.
- Distance
- 2,329 mi · 3,748 km
- Flight time
- 5h 55m
- Airlines
- 2
- Seats filled
- 82%
Airlines flying DCA to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 13 | Boeing 737-800, Boeing 737 MAX 8, Boeing 737 MAX 9 | 101,912 | 5h 56m |
| Delta Air Lines | 7 | Boeing 757-200, Airbus A321, Boeing 737-800 | 43,129 | 5h 52m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
DCA to SEA flight schedule
3 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 8:00am and the last at 5:00pm. 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 1Alaska Airlines | 8:00am | 10:58am | 31 | 80% |
| DL 786Delta Air Lines | 4:35pm | 7:41pm | 31 | 66% |
| AS 3Alaska Airlines | 5:00pm | 7:59pm | 31 | 73% |
Is DCA to SEA on time?
From September 2025 to August 2026, 73% of 1,092 flights arrived within 15 minutes of schedule and 1.4% were cancelled. Flights leaving around 8am were the most punctual (80%), those around 4pm the least (67%). Most delay time was caused by air traffic control and airport congestion (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 728 | 76% | 13 min | 0.7% |
| Delta Air Lines | 364 | 67% | 30 min | 2.7% |
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 |
|---|---|---|---|
| 8am to 9am | 365 | 80% | |
| 4pm to 5pm | 363 | 67% | |
| 5pm to 6pm | 364 | 73% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 91 | 13,289 | |
| September 2025 | 90 | 11,476 | |
| October 2025 | 93 | 12,047 | |
| November 2025 | 89 | 11,617 | |
| December 2025 | 91 | 12,864 | |
| January 2026 | 88 | 10,730 | |
| February 2026 | 83 | 10,466 | |
| March 2026 | 87 | 12,306 | |
| April 2026 | 90 | 12,402 | |
| May 2026 | 93 | 13,324 | |
| June 2026 | 88 | 12,268 | |
| July 2026 | 88 | 12,252 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.