Seattle (SEA) to Boise (BOI) flights

SkyWest Airlines, Horizon Air, Alaska Airlines fly nonstop from Seattle-Tacoma International Airport to Boise Air Terminal/Gowen Field, with about 101 flights a week in July 2026. The 399-mile flight takes about 1h 25m gate to gate.

From
SEA
Seattle
Seattle-Tacoma International Airport
To
BOI
Boise
Boise Air Terminal/Gowen Field
Distance
399 mi · 642 km
Flight time
1h 25m
Airlines
3
Seats filled
75%
Flights a week, July 2026
5,313 flights and 364,677 passengers in 12 months
BOIBOISEA
Map data: Natural Earth. Lines follow the shortest (great-circle) path.

Airlines flying SEA to BOI

AirlineFlights a weekAircraftPassengers (12 months)Flight time
SkyWest Airlines48Embraer E175165,6561h 28m
Horizon Air32Embraer E17593,2841h 21m
Alaska Airlines21Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9105,7371h 23m

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

SEA to BOI flight schedule

22 flight numbers flew this route in August 2026, 8 of them almost daily. The first usually leaves at 7:04am and the last at 9:31pm. Times are local and can change; check with the airline before you book.

FlightDepartsArrivesDays flown in August 2026On time (12 months)
AS 248Alaska Airlines7:04am9:37am3191%
DL 3750Delta Air Lines · operated by SkyWest Airlines7:15am9:55am3193%
DL 3678Delta Air Lines · operated by SkyWest Airlines9:03am11:43am3191%
AS 2230Alaska Airlines · operated by Horizon Air9:59am12:26pm1379%
AS 597Alaska Airlines10:00am12:36pm13100%
AS 428Alaska Airlines10:12am12:47pm580%
AS 2106Alaska Airlines · operated by Horizon Air11:36am2:07pm3165%
DL 3959Delta Air Lines · operated by SkyWest Airlines12:35pm3:18pm3189%
AS 441Alaska Airlines12:55pm3:26pm1880%
AS 467Alaska Airlines1:04pm3:31pm1385%
DL 4127Delta Air Lines · operated by SkyWest Airlines2:45pm5:19pm3187%
AS 2277Alaska Airlines · operated by Horizon Air3:41pm6:07pm9n/a
AS 2061Alaska Airlines · operated by Horizon Air3:45pm6:11pm1879%
DL 3688Delta Air Lines · operated by SkyWest Airlines4:10pm6:48pm3186%
AS 2109Alaska Airlines · operated by Horizon Air5:40pm8:07pm1878%
AS 586Alaska Airlines6:03pm8:33pm1377%
DL 3692Delta Air Lines · operated by SkyWest Airlines7:50pm10:30pm3186%
AS 2034Alaska Airlines · operated by Horizon Air7:59pm10:24pm1881%
AS 1751Alaska Airlines8:03pm10:33pm8n/a
AS 2262Alaska Airlines · operated by Horizon Air9:18pm11:44pm1383%
DL 4090Delta Air Lines · operated by SkyWest Airlines9:20pm11:53pm1784%
AS 463Alaska Airlines9:31pm12:04am1261%

Is SEA to BOI on time?

From September 2025 to August 2026, 85% of 5,237 flights arrived within 15 minutes of schedule and 0.4% were cancelled. Flights leaving around 7am were the most punctual (91%), those around 9pm the least (80%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (48%).

AirlineFlightsOn timeAverage delayCancelled
Alaska Airlines2,87382%9 min0.5%
Delta Air Lines2,36488%8 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
7am to 8am536
91%
8am to 9am281
90%
9am to 10am190
87%
10am to 11am413
88%
11am to 12pm258
76%
12pm to 1pm383
87%
1pm to 2pm445
88%
2pm to 3pm152
82%
3pm to 4pm395
84%
4pm to 5pm248
84%
5pm to 6pm496
84%
6pm to 7pm174
83%
7pm to 8pm458
82%
8pm to 9pm225
82%
9pm to 10pm583
80%

Flights by month

MonthFlightsFlights, relativePassengers
August 2025504
34,396
September 2025481
32,061
October 2025460
32,975
November 2025404
27,396
December 2025439
30,854
January 2026410
26,491
February 2026371
25,493
March 2026450
30,903
April 2026448
26,672
May 2026459
31,608
June 2026440
34,024
July 2026447
31,804

Related

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