Route Reliability

Route reliability

Anchorage (ANC) to Seattle (SEA): which airline is most on time?

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

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

Anchorage, AKSeattle, 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

ANC to SEA

Anchorage, AK to Seattle, WA

On time
86.1%vs 75.6% U.S. average Better than average
Cancelled
0.8%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
6,616in 12 months3 airlines
Most reliable airline
Delta Air Lines88.1% on time · 1,608 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 ANC 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 88.1% 0.7% 4.5% 104 min 0.1% 1,608
2. Alaska Airlines 85.6% 0.9% 3.5% 54 min 0.1% 4,997
Hawaiian Airlines Insufficient sample (fewer than 50 flights) 11

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 Anchorage (ANC) to Seattle (SEA): 88.1% of its 1,608 scheduled flights arrived within 15 minutes of schedule, compared with 85.6% for Alaska Airlines.
  • Hawaiian Airlines also flew this route but with fewer than 50 reported flights, too few to rate.
  • 0.8% of flights on this route were cancelled (about 1 in 125), 1.1 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 64 min.
  • Overall, 86.1% of flights on this route arrived on time, 10.5 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, May was the most reliable month on this route (90.5% on time) and July the least reliable (77.5%).
  • Cancellations peaked in January, when 4.0% of flights were cancelled.
  • Flights scheduled to depart 9 am to 10 am were the most punctual (92.2% on time); flights scheduled to depart 5 pm to 6 pm were the least (76.0%).
  • In the other direction, Seattle (SEA) to Anchorage (ANC), 75.9% of flights were on time and 0.7% were cancelled. Compare airlines SEA to ANC.

Best and worst months to fly ANC to SEA

Jan 77.5%
Feb 87.5%
Mar 83.9%
Apr 88.4%
May 90.5%
Jun 85.9%
Jul 77.5%
Aug 82.2%
Sep 84.9%
Oct 87.2%
Nov 83.7%
Dec 80.6%
Share of scheduled flights on time 12-month average 86.1%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 77.5% 1,487
February 87.5% 1,333
March 83.9% 1,490
April 88.4% 1,514
May 90.5% 1,949
June 85.9% 2,156
July 77.5% 2,336
August 82.2% 2,258
September 84.9% 1,985
October 87.2% 1,741
November 83.7% 1,563
December 80.6% 1,543
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Delta Air Lines May (95.9%) January (83.2%)
Alaska Airlines May (89.0%) January (75.9%)

Month by month, last 12 months

Sep 86.4%
Oct 87.2%
Nov 85.4%
Dec 78.1%
Jan 77.7%
Feb 88.2%
Mar 86.2%
Apr 94.7%
May 93.3%
Jun 89.0%
Jul 83.1%
Aug 84.0%
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 86.4% 625
Oct 2025 87.2% 555
Nov 2025 85.4% 485
Dec 2025 78.1% 475
Jan 2026 77.7% 475
Feb 2026 88.2% 415
Mar 2026 86.2% 478
Apr 2026 94.7% 452
May 2026 93.3% 585
Jun 2026 89.0% 664
Jul 2026 83.1% 721
Aug 2026 84.0% 686

Best and worst departure times

<6a 88.8%
6a 87.2%
7a 85.7%
8a 90.5%
9a 92.2%
10a 88.6%
11a 90.9%
12p 87.6%
1p 84.4%
2p 81.6%
3p 77.5%
4p 79.9%
5p 76.0%
6p 81.0%
7p 84.9%
8p Insufficient sample
11p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at ANC, 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 88.8% 1,964
Departing 6 am to 7 am 87.2% 654
Departing 7 am to 8 am 85.7% 321
Departing 8 am to 9 am 90.5% 349
Departing 9 am to 10 am 92.2% 307
Departing 10 am to 11 am 88.6% 273
Departing 11 am to noon 90.9% 396
Departing noon to 1 pm 87.6% 250
Departing 1 pm to 2 pm 84.4% 339
Departing 2 pm to 3 pm 81.6% 474
Departing 3 pm to 4 pm 77.5% 324
Departing 4 pm to 5 pm 79.9% 254
Departing 5 pm to 6 pm 76.0% 430
Departing 6 pm to 7 pm 81.0% 142
Departing 7 pm to 8 pm 84.9% 126
Departing 8 pm to 9 pm Insufficient sample 1
Departing 11 pm to midnight Insufficient sample 12
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 Anchorage, AK (ANC) 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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