Route Reliability

Route reliability

Seattle (SEA) to Boise (BOI): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Seattle, WA (SEA) to Boise, ID (BOI), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Seattle, WABoise, ID

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

SEA to BOI

Seattle, WA to Boise, ID

On time
86.0%vs 75.6% U.S. average Better than average
Cancelled
0.3%vs 1.9% U.S. average Better than average
60+ min late
3.7%vs 8.1% U.S. average Better than average
Scheduled flights
3,829in 12 months2 airlines
Most reliable airline
SkyWest Airlines87.5% on time · 2,853 flights

On time more often than the U.S. average, with fewer cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from SEA to BOI, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. SkyWest Airlines Operating carrier; sold as United Express, Delta Connection, American Eagle, Alaska Most reliable 87.5% 0.2% 3.5% 54 min 0.1% 2,853
2. Alaska Airlines 81.8% 0.4% 4.4% 45 min 0.1% 976

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

SkyWest Airlines has the strongest record on this route.

  • SkyWest Airlines had the best on-time record from Seattle (SEA) to Boise (BOI): 87.5% of its 2,853 scheduled flights arrived within 15 minutes of schedule, compared with 81.8% for Alaska Airlines.
  • 0.3% of flights on this route were cancelled, 1.6 points lower than the U.S. average of 1.9%.
  • 3.7% of flights, about 1 in 27, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 51 min.
  • Overall, 86.0% of flights on this route arrived on time, 10.4 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, October was the most reliable month on this route (90.7% on time) and June the least reliable (79.0%).
  • Flights scheduled to depart 11 am to noon were the most punctual (93.2% on time); flights scheduled to depart 9 pm to 10 pm were the least (78.6%).
  • In the other direction, Boise (BOI) to Seattle (SEA), 84.5% of flights were on time and 0.4% were cancelled. Compare airlines BOI to SEA.

Best and worst months to fly SEA to BOI

Jan 81.2%
Feb 82.1%
Mar 85.6%
Apr 87.2%
May 84.4%
Jun 79.0%
Jul 80.1%
Aug 81.3%
Sep 83.5%
Oct 90.7%
Nov 87.2%
Dec 81.7%
Share of scheduled flights on time 12-month average 86.0%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 81.2% 918
February 82.1% 890
March 85.6% 1,055
April 87.2% 1,030
May 84.4% 1,059
June 79.0% 1,003
July 80.1% 1,009
August 81.3% 998
September 83.5% 1,016
October 90.7% 1,064
November 87.2% 904
December 81.7% 802
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
SkyWest Airlines October (91.7%) June (78.9%)
Alaska Airlines October (86.6%) July (68.4%)

Month by month, last 12 months

Sep 86.2%
Oct 91.6%
Nov 85.5%
Dec 85.3%
Jan 86.7%
Feb 86.7%
Mar 83.5%
Apr 89.3%
May 87.9%
Jun 85.6%
Jul 78.5%
Aug 84.6%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 86.2% 334
Oct 2025 91.6% 333
Nov 2025 85.5% 282
Dec 2025 85.3% 266
Jan 2026 86.7% 300
Feb 2026 86.7% 294
Mar 2026 83.5% 369
Apr 2026 89.3% 355
May 2026 87.9% 363
Jun 2026 85.6% 312
Jul 2026 78.5% 303
Aug 2026 84.6% 318

Best and worst departure times

7a 91.5%
8a 91.8%
9a 89.4%
10a 88.0%
11a 93.2%
12p 86.2%
1p 89.3%
2p 81.5%
3p 88.1%
4p 84.0%
5p 84.8%
6p 85.4%
7p 81.9%
8p 81.6%
9p 78.6%
Share of scheduled flights on time
By scheduled local departure hour at SEA, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing 7 am to 8 am 91.5% 516
Departing 8 am to 9 am 91.8% 170
Departing 9 am to 10 am 89.4% 104
Departing 10 am to 11 am 88.0% 350
Departing 11 am to noon 93.2% 118
Departing noon to 1 pm 86.2% 383
Departing 1 pm to 2 pm 89.3% 318
Departing 2 pm to 3 pm 81.5% 151
Departing 3 pm to 4 pm 88.1% 109
Departing 4 pm to 5 pm 84.0% 194
Departing 5 pm to 6 pm 84.8% 276
Departing 6 pm to 7 pm 85.4% 144
Departing 7 pm to 8 pm 81.9% 392
Departing 8 pm to 9 pm 81.6% 206
Departing 9 pm to 10 pm 78.6% 398
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from Seattle, WA (SEA) to Boise, ID (BOI), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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