Route Reliability

Route reliability

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

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

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

Boise, IDSeattle, WA

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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

BOI to SEA

Boise, ID to Seattle, WA

On time
84.5%vs 75.6% U.S. average Better than average
Cancelled
0.4%vs 1.9% U.S. average Better than average
60+ min late
4.0%vs 8.1% U.S. average Better than average
Scheduled flights
3,730in 12 months2 airlines
Most reliable airline
SkyWest Airlines85.5% on time · 2,754 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 BOI to SEA, 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 85.5% 0.3% 4.2% 61 min 0.1% 2,754
2. Alaska Airlines 81.7% 0.7% 3.5% 44 min 0.0% 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 Boise (BOI) to Seattle (SEA): 85.5% of its 2,754 scheduled flights arrived within 15 minutes of schedule, compared with 81.7% for Alaska Airlines.
  • 0.4% of flights on this route were cancelled, 1.5 points lower than the U.S. average of 1.9%.
  • 4.0% of flights, about 1 in 25, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 56 min.
  • Overall, 84.5% of flights on this route arrived on time, 8.9 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, March was the most reliable month on this route (88.1% on time) and August the least reliable (77.7%).
  • Flights scheduled to depart before 6 am were the most punctual (94.2% on time); flights scheduled to depart 6 pm to 7 pm were the least (71.4%).
  • In the other direction, Seattle (SEA) to Boise (BOI), 86.0% of flights were on time and 0.3% were cancelled. Compare airlines SEA to BOI.

Best and worst months to fly BOI to SEA

Jan 77.8%
Feb 85.0%
Mar 88.1%
Apr 87.1%
May 84.6%
Jun 81.0%
Jul 80.8%
Aug 77.7%
Sep 83.3%
Oct 86.7%
Nov 86.9%
Dec 84.0%
Share of scheduled flights on time 12-month average 84.5%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 77.8% 906
February 85.0% 889
March 88.1% 1,054
April 87.1% 1,031
May 84.6% 1,044
June 81.0% 974
July 80.8% 977
August 77.7% 977
September 83.3% 959
October 86.7% 998
November 86.9% 870
December 84.0% 771
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
SkyWest Airlines April (88.7%) August (77.3%)
Alaska Airlines March (88.2%) July (75.4%)

Month by month, last 12 months

Sep 83.6%
Oct 84.7%
Nov 84.9%
Dec 86.6%
Jan 83.2%
Feb 92.8%
Mar 87.0%
Apr 89.0%
May 84.7%
Jun 81.7%
Jul 78.2%
Aug 77.7%
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 83.6% 330
Oct 2025 84.7% 301
Nov 2025 84.9% 252
Dec 2025 86.6% 238
Jan 2026 83.2% 292
Feb 2026 92.8% 293
Mar 2026 87.0% 369
Apr 2026 89.0% 356
May 2026 84.7% 366
Jun 2026 81.7% 312
Jul 2026 78.2% 303
Aug 2026 77.7% 318

Best and worst departure times

<6a 94.2%
6a 92.4%
7a 91.6%
8a 87.2%
9a 79.0%
10a 86.2%
11a 89.1%
12p 88.0%
1p 89.3%
2p 88.4%
3p 84.7%
4p 71.9%
5p 87.0%
6p 71.4%
7p 77.6%
8p 65.1%
9p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at BOI, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 94.2% 276
Departing 6 am to 7 am 92.4% 447
Departing 7 am to 8 am 91.6% 249
Departing 8 am to 9 am 87.2% 296
Departing 9 am to 10 am 79.0% 291
Departing 10 am to 11 am 86.2% 239
Departing 11 am to noon 89.1% 202
Departing noon to 1 pm 88.0% 108
Departing 1 pm to 2 pm 89.3% 242
Departing 2 pm to 3 pm 88.4% 138
Departing 3 pm to 4 pm 84.7% 157
Departing 4 pm to 5 pm 71.9% 253
Departing 5 pm to 6 pm 87.0% 208
Departing 6 pm to 7 pm 71.4% 339
Departing 7 pm to 8 pm 77.6% 196
Departing 8 pm to 9 pm 65.1% 63
Departing 9 pm to 10 pm Insufficient sample 26
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 Boise, ID (BOI) to Seattle, WA (SEA), 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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