Boston (BOS) to Seattle (SEA) flights
Alaska Airlines, Delta Air Lines, JetBlue fly nonstop from Boston Logan International Airport to Seattle-Tacoma International Airport, with about 70 flights a week in July 2026. The 2,496-mile flight takes about 6h 19m gate to gate.
- Distance
- 2,496 mi · 4,017 km
- Flight time
- 6h 19m
- Airlines
- 3
- Seats filled
- 86%
Airlines flying BOS to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 31 | Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800 | 186,925 | 6h 21m |
| Delta Air Lines | 26 | Airbus A321, Boeing 737-800 | 167,777 | 6h 18m |
| JetBlue | 13 | Airbus A321, Airbus A320-100/200 | 40,093 | 6h 11m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
BOS to SEA flight schedule
15 flight numbers flew this route in August 2026, 7 of them almost daily. The first usually leaves at 7:03am and the last at 7:59pm. 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 459Alaska Airlines | 7:03am | 10:26am | 31 | 72% |
| B6 397JetBlue | 7:09am | 10:30am | 31 | 85% |
| DL 384Delta Air Lines | 7:45am | 11:08am | 31 | 74% |
| AS 338Alaska Airlines | 9:00am | 12:23pm | 18 | 74% |
| AS 215Alaska Airlines | 10:03am | 1:15pm | 13 | 63% |
| DL 332Delta Air Lines | 11:20am | 2:41pm | 31 | 75% |
| AS 1506Alaska Airlines | 3:26pm | 6:45pm | 13 | 74% |
| AS 477Alaska Airlines | 3:31pm | 6:46pm | 8 | n/a |
| DL 2889Delta Air Lines | 4:05pm | 7:40pm | 25 | 73% |
| AS 289Alaska Airlines | 4:52pm | 8:07pm | 13 | 62% |
| AS 304Alaska Airlines | 5:56pm | 9:26pm | 18 | 51% |
| B6 197JetBlue | 7:30pm | 10:53pm | 31 | 42% |
| DL 324Delta Air Lines | 7:35pm | 11:11pm | 31 | 65% |
| AS 1337Alaska Airlines | 7:44pm | 11:07pm | 15 | 54% |
| AS 306Alaska Airlines | 7:59pm | 11:12pm | 13 | 58% |
Is BOS to SEA on time?
From September 2025 to August 2026, 70% of 2,555 flights arrived within 15 minutes of schedule and 1.5% were cancelled. Flights leaving around 4pm were the most punctual (77%), those around 7pm the least (58%). Most delay time was caused by late-arriving aircraft (37%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 1,240 | 69% | 17 min | 1.4% |
| Delta Air Lines | 1,068 | 71% | 18 min | 1.6% |
| JetBlue | 247 | 71% | 20 min | 1.6% |
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 | 857 | 76% | |
| 9am to 10am | 327 | 75% | |
| 11am to 12pm | 247 | 75% | |
| 3pm to 4pm | 107 | 72% | |
| 4pm to 5pm | 134 | 77% | |
| 5pm to 6pm | 103 | 56% | |
| 6pm to 7pm | 452 | 61% | |
| 7pm to 8pm | 294 | 58% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 271 | 47,220 | |
| September 2025 | 228 | 37,190 | |
| October 2025 | 226 | 36,601 | |
| November 2025 | 162 | 24,747 | |
| December 2025 | 155 | 24,769 | |
| January 2026 | 124 | 17,916 | |
| February 2026 | 120 | 17,766 | |
| March 2026 | 170 | 25,678 | |
| April 2026 | 171 | 26,281 | |
| May 2026 | 253 | 41,217 | |
| June 2026 | 275 | 43,905 | |
| July 2026 | 310 | 51,505 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.