PlainFlights

Route · AUS → SEA · 2020–2025 BTS data

Austin to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), AUS to SEA (Austin to Seattle) ranks #1133 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84.4%
On-time
+5.4 pts
vs US avg
69 min
Delay when late
10,171
Flights
#1133 of 4927
Corpus placement

Cancelled

1.3%

Best Month

Feb 2024 91%

Worst Month

May 2024 68%

Distance

1,770 mi

Carriers

6

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 169 50 1 0 DL,AS
Nov 2025 172 24 2 1 DL,AS
Oct 2025 173 27 4 0 AS,DL
Sep 2025 167 23 0 0 DL,AS
Aug 2025 195 35 1 0 AS,DL
Jul 2025 208 39 3 0 AS,DL
Jun 2025 204 53 0 0 AS,DL
May 2025 196 57 2 0 AS,DL
Apr 2025 175 16 1 1 DL,AS
Mar 2025 167 25 0 0 AS,DL
Feb 2025 106 22 1 0 AS,DL
Jan 2025 113 14 0 0 AS,DL
Dec 2024 157 29 0 0 AS,DL
Nov 2024 185 29 3 3 AS,DL
Oct 2024 196 23 0 0 AS,DL
Sep 2024 204 30 1 1 AS,DL
Aug 2024 193 30 0 2 AS,DL
Jul 2024 178 51 6 0 AS,DL
Jun 2024 174 42 2 0 AS,DL
May 2024 182 58 1 1 AS,DL
Apr 2024 169 21 1 0 AS,DL
Mar 2024 145 19 0 0 AS,DL
Feb 2024 115 10 1 1 AS,DL
Jan 2024 124 30 21 0 AS,DL

AUS–SEA seasonal on-time pattern

Best: April (88.9%) · weakest: May (78.6%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 82.3%

Strongest calendar month

April

88.9% on-time · ~133 flights/mo

Busiest calendar month

August

~171 flights/mo avg

Weakest calendar month

May

78.6% on-time · ~141 flights/mo

Cancellation Rate

1.3%

51 of 4,067 flights

Diversion Rate

0.2%

10 of 4,067 flights

Explore origin & destination

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

AUS - Austin

Full on-time, delay-cause, and seasonal performance for Austin, TX.

AUS on-time profile

SEA - Seattle

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

SEA on-time profile

Compare the two airports

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

Compare AUS vs SEA

Origin-hub reliability standing

Mid-pack among AUS departures

From AUS, this corridor sits with 45 other 75–85% on-time routes out of 55 tracked departures, not the hub's reliability leaders (3 at ≥85%) and not the softest ( 7 below 75%). Destination: Seattle · fleet on-time rank #1418 of 4927.

What the Data Says About AUS to SEA

Bureau of Transportation Statistics records show Austin to Seattle (AUS to SEA) running a 84.4% on-time rate over 10,171 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 68.7 minutes. The 1,770-mile corridor is served by 6 carriers, and over the last 24 months 1.3% of 4,067 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 91% on-time, while May 2024 came in at just 68% - a 23-point swing worth factoring into travel timing.

On the multi-year calendar, AUS–SEA peaks in April at 88.9% on-time while August carries the heaviest traffic (~171 flights per month) ; the softest month is May at 78.6%, a 10.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does AUS to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, AUS to SEA ranks #1133 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 AUS to SEA? ▼
Flights from Austin to Seattle have a 84.4% on-time rate based on 10,171 flights. The average delay is 68.7 minutes. The best recent month was Feb 2024 with 91% on-time.
What is the cancellation rate for AUS to SEA? ▼
Over the last 24 months, 1.3% of flights on this route were cancelled (51 of 4,067 flights) and 0.2% were diverted.
How far is the flight from AUS to SEA? ▼
The flight distance from Austin (AUS) to Seattle (SEA) is approximately 1,770 miles. This route is served by 6 carriers.
When is the best time to fly from AUS to SEA? ▼
The best recent month for on-time performance was Feb 2024 (91% on-time). The worst was May 2024 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

AUS Airport

Austin
SEA Airport

Seattle
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 AUS–SEA data

AUS–SEA runs 5.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare AUS and SEA airport profiles: delay causes and top routes differ even on the same corridor. AUS airport
  • If your dates flex, April (88.9% on-time) beats May (78.6%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84.4% 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.