Seattle (SEA) to Washington (DCA) flights
Alaska Airlines, Delta Air Lines fly nonstop from Seattle-Tacoma International Airport to Ronald Reagan Washington National Airport, with about 20 flights a week in July 2026. The 2,329-mile flight takes about 4h 55m gate to gate.
- Distance
- 2,329 mi · 3,748 km
- Flight time
- 4h 55m
- Airlines
- 2
- Seats filled
- 84%
Airlines flying SEA to DCA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 13 | Boeing 737-800, Boeing 737 MAX 8 | 101,648 | 4h 55m |
| Delta Air Lines | 7 | Boeing 757-200, Airbus A321, Boeing 737-800 | 46,682 | 4h 54m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to DCA flight schedule
3 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 7:20am and the last at 1:46pm. 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) |
|---|---|---|---|---|
| DL 786Delta Air Lines | 7:20am | 3:21pm | 31 | 91% |
| AS 4Alaska Airlines | 8:00am | 4:16pm | 31 | 85% |
| AS 2Alaska Airlines | 1:46pm | 9:59pm | 31 | 71% |
Is SEA to DCA on time?
From September 2025 to August 2026, 83% of 1,092 flights arrived within 15 minutes of schedule and 1.4% were cancelled. Flights leaving around 7am were the most punctual (92%), those around 1pm the least (71%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 728 | 78% | 12 min | 0.7% |
| Delta Air Lines | 364 | 92% | 11 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 |
|---|---|---|---|
| 7am to 8am | 364 | 92% | |
| 8am to 9am | 364 | 85% | |
| 1pm to 2pm | 363 | 71% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 90 | 13,875 | |
| September 2025 | 89 | 12,291 | |
| October 2025 | 93 | 12,298 | |
| November 2025 | 85 | 10,926 | |
| December 2025 | 90 | 11,973 | |
| January 2026 | 88 | 11,068 | |
| February 2026 | 83 | 10,403 | |
| March 2026 | 88 | 12,327 | |
| April 2026 | 90 | 12,861 | |
| May 2026 | 93 | 13,544 | |
| June 2026 | 89 | 13,238 | |
| July 2026 | 88 | 13,526 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.