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Route · SEA → ANC · 2020–2025 BTS data

Seattle to Anchorage

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to ANC (Seattle to Anchorage) ranks #33 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

77.5%
On-time
-1.5 pts
vs US avg
50 min
Delay when late
41,143
Flights
#33 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Sep 2025 88%

Worst Month

Dec 2025 55%

Distance

1,448 mi

Carriers

10

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 478 214 5 2 DL,AS
Nov 2025 483 72 6 0 DL,AS
Oct 2025 553 127 9 0 AS,DL
Sep 2025 624 72 1 0 DL,AS,HA
Aug 2025 724 198 8 0 HA,AS,DL
Jul 2025 745 250 16 0 AS,DL,HA
Jun 2025 701 232 4 1 AS,DL,HA
May 2025 666 173 5 0 AS,DL
Apr 2025 491 128 1 1 DL,AS
Mar 2025 476 72 2 0 AS,DL
Feb 2025 439 89 5 0 AS,DL
Jan 2025 499 146 4 1 AS,DL
Dec 2024 513 101 0 2 AS,DL
Nov 2024 516 94 1 0 AS,DL
Oct 2024 588 101 4 1 AS,DL
Sep 2024 662 166 3 0 AS,DL
Aug 2024 844 256 7 1 AS,DL
Jul 2024 869 274 9 0 AS,DL
Jun 2024 796 231 6 2 AS,DL
May 2024 701 264 4 0 AS,DL
Apr 2024 570 139 1 0 AS,DL
Mar 2024 534 119 1 1 AS,DL
Feb 2024 480 87 0 0 AS,DL
Jan 2024 517 168 38 1 AS,DL

SEA–ANC seasonal on-time pattern

Best: September (83.6%) · weakest: December (67.0%)

65%70%75%80%85% JanFebMarAprMayJunJulAugSepOctNovDec 67%

Strongest calendar month

September

83.6% on-time · ~623 flights/mo

Busiest calendar month

August

~743 flights/mo avg

Weakest calendar month

December

67.0% on-time · ~500 flights/mo

Cancellation Rate

1.0%

140 of 14,469 flights

Diversion Rate

0.1%

13 of 14,469 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

ANC - Anchorage

Full on-time, delay-cause, and seasonal performance for Anchorage, AK.

ANC on-time profile

Compare the two airports

See SEA and ANC side by side on delays, cancellations, and reliability.

Compare SEA vs ANC

Origin-hub reliability standing

Mid-pack among SEA departures

From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Anchorage · fleet on-time rank #3981 of 4927.

What the Data Says About SEA to ANC

The Seattle to Anchorage corridor (SEA to ANC) posts a 77.5% on-time rate on the lower edge of the average band, based on 41,143 tracked flights. Late flights run 50.0 minutes behind on average. 10 carriers cover the 1,448-mile route; over the last 24 months, 140 of 14,469 flights were cancelled (1.0%) and 0.1% diverted.

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 88% on-time, while Dec 2025 came in at just 55% - a 33-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–ANC peaks in September at 83.6% on-time while August carries the heaviest traffic (~743 flights per month) ; the softest month is December at 67.0%, a 16.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to ANC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to ANC ranks #33 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SEA to ANC? ▼
Flights from Seattle to Anchorage have a 77.5% on-time rate based on 41,143 flights. The average delay is 50.0 minutes. The best recent month was Sep 2025 with 88% on-time.
What is the cancellation rate for SEA to ANC? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (140 of 14,469 flights) and 0.1% were diverted.
How far is the flight from SEA to ANC? ▼
The flight distance from Seattle (SEA) to Anchorage (ANC) is approximately 1,448 miles. This route is served by 10 carriers.
When is the best time to fly from SEA to ANC? ▼
The best recent month for on-time performance was Sep 2025 (88% on-time). The worst was Dec 2025 (55% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
ANC Airport

Anchorage
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SEA–ANC data

SEA–ANC is mid-pack at 77.5% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and ANC airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, September (83.6% on-time) beats December (67.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 77.5% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.