PlainFlights

Route · SAT → SEA · 2020–2025 BTS data

San Antonio to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SAT to SEA (San Antonio to Seattle) ranks #3430 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

75.8%
On-time
-3.2 pts
vs US avg
53 min
Delay when late
2,724
Flights
#3430 of 4927
Corpus placement

Cancelled

0.8%

Best Month

Dec 2023 82%

Worst Month

Jun 2025 60%

Distance

1,774 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 52 19 0 0 AS
Nov 2025 50 9 2 0 AS
Oct 2025 54 12 2 0 AS
Sep 2025 47 3 0 0 AS
Aug 2025 57 16 1 0 AS
Jul 2025 61 22 1 1 AS
Jun 2025 60 24 0 0 AS
May 2025 60 21 0 0 AS
Apr 2025 59 14 0 0 AS
Mar 2025 44 11 0 1 AS
Dec 2024 53 11 0 0 AS
Nov 2024 50 9 1 0 AS
Oct 2024 48 5 0 0 AS
Sep 2024 48 9 0 0 AS
Aug 2024 56 16 0 2 AS
Jul 2024 62 20 0 0 AS
Jun 2024 60 23 0 0 AS
May 2024 62 17 0 0 AS
Apr 2024 56 18 0 0 AS
Mar 2024 57 12 0 0 AS
Feb 2024 43 8 0 0 AS
Jan 2024 38 10 3 0 AS
Dec 2023 62 11 0 1 AS
Nov 2023 43 8 0 0 AS

SAT–SEA seasonal on-time pattern

Best: February (85.2%) · weakest: June (61.9%)

60%70%80%90% JanFebMarAprMayJunJulAugSepOctNovDec 75.6%

Strongest calendar month

February

85.2% on-time · ~45 flights/mo

Busiest calendar month

April

~48 flights/mo avg

Weakest calendar month

June

61.9% on-time · ~46 flights/mo

Cancellation Rate

0.8%

10 of 1,282 flights

Diversion Rate

0.4%

5 of 1,282 flights

Explore origin & destination

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

SAT - San Antonio

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

SAT 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 SAT and SEA side by side on delays, cancellations, and reliability.

Compare SAT vs SEA

Origin-hub reliability standing

Mid-pack among SAT departures

From SAT, this corridor sits with 12 other 75–85% on-time routes out of 31 tracked departures, not the hub's reliability leaders (17 at ≥85%) and not the softest ( 2 below 75%). Destination: Seattle · fleet on-time rank #4351 of 4927.

What the Data Says About SAT to SEA

The San Antonio to Seattle corridor (SAT to SEA) posts a 75.8% on-time rate on the lower edge of the average band, based on 2,724 tracked flights. Late flights run 52.6 minutes behind on average. 1 carrier cover the 1,774-mile route; over the last 24 months, 10 of 1,282 flights were cancelled (0.8%) and 0.4% diverted.

The monthly split is wide on this route: Dec 2023 posted the strongest performance at 82% on-time, while Jun 2025 came in at just 60% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, SAT–SEA peaks in February at 85.2% on-time while April carries the heaviest traffic (~48 flights per month) ; the softest month is June at 61.9%, a 23.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SAT to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SAT to SEA ranks #3430 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 SAT to SEA? ▼
Flights from San Antonio to Seattle have a 75.8% on-time rate based on 2,724 flights. The average delay is 52.6 minutes. The best recent month was Dec 2023 with 82% on-time.
What is the cancellation rate for SAT to SEA? ▼
Over the last 24 months, 0.8% of flights on this route were cancelled (10 of 1,282 flights) and 0.4% were diverted.
How far is the flight from SAT to SEA? ▼
The flight distance from San Antonio (SAT) to Seattle (SEA) is approximately 1,774 miles. This route is served by 1 carrier.
When is the best time to fly from SAT to SEA? ▼
The best recent month for on-time performance was Dec 2023 (82% on-time). The worst was Jun 2025 (60% on-time). Consider booking during months with historically better performance.

Airports on this route

SAT Airport

San Antonio
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 SAT–SEA data

SAT–SEA is mid-pack at 75.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare SAT and SEA airport profiles: delay causes and top routes differ even on the same corridor. SAT airport
  • If your dates flex, February (85.2% on-time) beats June (61.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 75.8% 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.