Raleigh/Durham (RDU) to Seattle (SEA) flights
Alaska Airlines, Delta Air Lines fly nonstop from Raleigh-Durham International Airport to Seattle-Tacoma International Airport, with about 21 flights a week in July 2026. The 2,354-mile flight takes about 5h 53m gate to gate.
- Distance
- 2,354 mi · 3,788 km
- Flight time
- 5h 53m
- Airlines
- 2
- Seats filled
- 85%
Airlines flying RDU to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 14 | Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800 | 82,056 | 5h 53m |
| Delta Air Lines | 7 | Boeing 737-800, Boeing 737-900ER | 49,500 | 5h 53m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
RDU to SEA flight schedule
4 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 6:33am and the last at 7:13pm. 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 354Delta Air Lines | 6:33am | 9:20am | 31 | 84% |
| AS 670Alaska Airlines | 7:02am | 9:56am | 31 | 75% |
| AS 572Alaska Airlines | 5:34pm | 8:33pm | 18 | 72% |
| AS 651Alaska Airlines | 7:13pm | 9:58pm | 8 | n/a |
Is RDU to SEA on time?
From September 2025 to August 2026, 78% of 918 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 6am were the most punctual (85%), those around 7pm the least (70%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 554 | 75% | 14 min | 1.1% |
| Delta Air Lines | 364 | 83% | 10 min | 1.4% |
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 |
|---|---|---|---|
| 6am to 7am | 177 | 85% | |
| 7am to 8am | 411 | 80% | |
| 5pm to 6pm | 91 | 70% | |
| 6pm to 7pm | 130 | 75% | |
| 7pm to 8pm | 109 | 70% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 85 | 13,661 | |
| September 2025 | 75 | 10,553 | |
| October 2025 | 64 | 8,729 | |
| November 2025 | 65 | 8,804 | |
| December 2025 | 71 | 10,760 | |
| January 2026 | 63 | 7,870 | |
| February 2026 | 53 | 6,937 | |
| March 2026 | 68 | 9,815 | |
| April 2026 | 81 | 11,045 | |
| May 2026 | 91 | 13,854 | |
| June 2026 | 90 | 14,489 | |
| July 2026 | 92 | 15,039 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.