Boise (BOI) to Seattle (SEA) flights

SkyWest Airlines, Horizon Air, Alaska Airlines fly nonstop from Boise Air Terminal/Gowen Field to Seattle-Tacoma International Airport, with about 101 flights a week in July 2026. The 399-mile flight takes about 1h 41m gate to gate.

From
BOI
Boise
Boise Air Terminal/Gowen Field
To
SEA
Seattle
Seattle-Tacoma International Airport
Distance
399 mi · 642 km
Flight time
1h 41m
Airlines
3
Seats filled
77%
Flights a week, July 2026
5,314 flights and 373,207 passengers in 12 months
SEASEABOI
Map data: Natural Earth. Lines follow the shortest (great-circle) path.

Airlines flying BOI to SEA

AirlineFlights a weekAircraftPassengers (12 months)Flight time
SkyWest Airlines47Embraer E175159,8331h 44m
Horizon Air33Embraer E175102,8971h 37m
Alaska Airlines21Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9110,4771h 39m

Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.

BOI to SEA flight schedule

22 flight numbers flew this route in August 2026, 7 of them almost daily. The first usually leaves at 6:23am and the last at 8:47pm. Times are local and can change; check with the airline before you book.

FlightDepartsArrivesDays flown in August 2026On time (12 months)
AS 423Alaska Airlines6:23am7:00am1899%
AS 739Alaska Airlines6:23am7:02am13100%
DL 3775Delta Air Lines · operated by SkyWest Airlines6:49am7:35am3195%
AS 345Alaska Airlines8:03am8:42am1388%
AS 2070Alaska Airlines · operated by Horizon Air8:15am8:50am1788%
DL 3740Delta Air Lines · operated by SkyWest Airlines8:59am9:49am3182%
AS 2166Alaska Airlines · operated by Horizon Air10:00am10:34am1740%
AS 2347Alaska Airlines · operated by Horizon Air10:00am10:37am1348%
DL 3750Delta Air Lines · operated by SkyWest Airlines10:35am11:28am3187%
AS 2159Alaska Airlines · operated by Horizon Air11:42am12:16pm1867%
DL 3678Delta Air Lines · operated by SkyWest Airlines12:23pm1:12pm3190%
AS 2231Alaska Airlines · operated by Horizon Air1:06pm1:40pm1360%
AS 2242Alaska Airlines · operated by Horizon Air1:15pm1:49pm9n/a
AS 595Alaska Airlines2:17pm2:53pm1392%
DL 3958Delta Air Lines · operated by SkyWest Airlines3:29pm4:10pm3179%
AS 565Alaska Airlines4:17pm4:53pm1377%
AS 740Alaska Airlines4:35pm5:15pm1848%
AS 1342Alaska Airlines5:52pm6:33pm8n/a
DL 4127Delta Air Lines · operated by SkyWest Airlines5:59pm6:37pm3183%
AS 296Alaska Airlines6:13pm6:53pm1771%
DL 3688Delta Air Lines · operated by SkyWest Airlines7:28pm8:14pm1776%
AS 2352Alaska Airlines · operated by Horizon Air8:47pm9:21pm3158%

Is BOI to SEA on time?

From September 2025 to August 2026, 81% of 5,239 flights arrived within 15 minutes of schedule and 0.5% were cancelled. Flights leaving around 5am were the most punctual (95%), those around 10am the least (67%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (42%).

AirlineFlightsOn timeAverage delayCancelled
Alaska Airlines2,87277%12 min0.7%
Delta Air Lines2,36786%9 min0.2%

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 departureFlightsOn time, relativeOn time
5am to 6am276
95%
6am to 7am447
93%
7am to 8am249
92%
8am to 9am462
88%
9am to 10am379
73%
10am to 11am502
67%
11am to 12pm471
87%
12pm to 1pm135
84%
1pm to 2pm359
87%
2pm to 3pm222
89%
3pm to 4pm264
84%
4pm to 5pm391
77%
5pm to 6pm208
87%
6pm to 7pm339
71%
7pm to 8pm230
77%
8pm to 9pm249
58%

Flights by month

MonthFlightsFlights, relativePassengers
August 2025505
32,593
September 2025481
31,808
October 2025456
32,984
November 2025404
28,093
December 2025445
31,308
January 2026408
28,513
February 2026372
25,774
March 2026454
32,126
April 2026446
27,895
May 2026460
36,570
June 2026441
33,275
July 2026448
33,192

Related

Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.