Route Reliability

Route reliability

Spokane (GEG) to Seattle (SEA): which airline is most on time?

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

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

Spokane, WASeattle, 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

GEG to SEA

Spokane, WA to Seattle, WA

On time
84.8%vs 75.6% U.S. average Better than average
Cancelled
1.0%vs 1.9% U.S. average Better than average
60+ min late
3.9%vs 8.1% U.S. average Better than average
Scheduled flights
4,927in 12 months3 airlines
Most reliable airline
Delta Air Lines91.8% on time · 343 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 GEG 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. Delta Air Lines Most reliable 91.8% 1.5% 3.5% 152 min 0.0% 343
2. SkyWest Airlines Operating carrier; sold as United Express, Delta Connection, American Eagle, Alaska 86.6% 1.1% 3.7% 68 min 0.1% 2,841
3. Alaska Airlines 80.4% 0.8% 4.2% 49 min 0.0% 1,743

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

Delta Air Lines has the strongest record on this route.

  • Delta Air Lines had the best on-time record from Spokane (GEG) to Seattle (SEA): 91.8% of its 343 scheduled flights arrived within 15 minutes of schedule, compared with 80.4% for Alaska Airlines.
  • 1.0% of flights on this route were cancelled (about 1 in 100), 0.9 points lower than the U.S. average of 1.9%.
  • 3.9% of flights, about 1 in 26, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 62 min.
  • Overall, 84.8% of flights on this route arrived on time, 9.2 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, April was the most reliable month on this route (89.5% on time) and January the least reliable (76.0%).
  • Cancellations peaked in January, when 2.6% of flights were cancelled.
  • Flights scheduled to depart 6 am to 7 am were the most punctual (94.9% on time); flights scheduled to depart 7 pm to 8 pm were the least (76.8%).
  • In the other direction, Seattle (SEA) to Spokane (GEG), 82.3% of flights were on time and 0.9% were cancelled. Compare airlines SEA to GEG.

Best and worst months to fly GEG to SEA

Jan 76.0%
Feb 84.0%
Mar 87.0%
Apr 89.5%
May 86.1%
Jun 83.3%
Jul 79.6%
Aug 80.6%
Sep 85.8%
Oct 88.2%
Nov 85.8%
Dec 80.9%
Share of scheduled flights on time 12-month average 84.8%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 76.0% 1,228
February 84.0% 1,163
March 87.0% 1,274
April 89.5% 1,234
May 86.1% 1,298
June 83.3% 1,251
July 79.6% 1,362
August 80.6% 1,363
September 85.8% 1,468
October 88.2% 1,392
November 85.8% 1,351
December 80.9% 1,241
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Delta Air Lines April (95.6%) January (81.0%)
SkyWest Airlines April (92.3%) January (76.7%)
Alaska Airlines November (87.3%) July (68.2%)

Month by month, last 12 months

Sep 85.6%
Oct 85.0%
Nov 86.1%
Dec 80.3%
Jan 80.5%
Feb 90.8%
Mar 86.1%
Apr 90.7%
May 90.8%
Jun 87.7%
Jul 77.1%
Aug 76.4%
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 85.6% 436
Oct 2025 85.0% 447
Nov 2025 86.1% 424
Dec 2025 80.3% 396
Jan 2026 80.5% 437
Feb 2026 90.8% 400
Mar 2026 86.1% 418
Apr 2026 90.7% 387
May 2026 90.8% 415
Jun 2026 87.7% 375
Jul 2026 77.1% 385
Aug 2026 76.4% 407

Best and worst departure times

<6a 91.3%
6a 94.9%
7a 88.0%
8a 83.6%
9a 80.3%
10a Insufficient sample
11a 84.1%
12p 84.3%
1p 79.7%
2p 80.5%
3p 89.4%
4p 82.0%
5p 84.8%
6p Insufficient sample
7p 76.8%
Share of scheduled flights on time
By scheduled local departure hour at GEG, 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 91.3% 573
Departing 6 am to 7 am 94.9% 413
Departing 7 am to 8 am 88.0% 667
Departing 8 am to 9 am 83.6% 73
Departing 9 am to 10 am 80.3% 457
Departing 10 am to 11 am Insufficient sample 31
Departing 11 am to noon 84.1% 446
Departing noon to 1 pm 84.3% 121
Departing 1 pm to 2 pm 79.7% 645
Departing 2 pm to 3 pm 80.5% 87
Departing 3 pm to 4 pm 89.4% 303
Departing 4 pm to 5 pm 82.0% 150
Departing 5 pm to 6 pm 84.8% 342
Departing 6 pm to 7 pm Insufficient sample 20
Departing 7 pm to 8 pm 76.8% 599
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 Spokane, WA (GEG) 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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