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Route · SEA → SAT · 2020–2025 BTS data

Seattle to San Antonio

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to SAT (Seattle to San Antonio) ranks #3411 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

77.7%
On-time
-1.3 pts
vs US avg
48 min
Delay when late
2,754
Flights
#3411 of 4927
Corpus placement

Cancelled

0.8%

Best Month

Dec 2023 85%

Worst Month

Aug 2024 59%

Distance

1,774 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 52 16 0 0 AS
Nov 2025 50 11 2 0 AS
Oct 2025 54 9 2 0 AS
Sep 2025 47 3 0 0 AS
Aug 2025 57 17 1 1 AS
Jul 2025 61 24 1 0 AS
Jun 2025 60 22 0 0 AS
May 2025 60 12 0 0 AS
Apr 2025 59 9 0 1 AS
Mar 2025 45 5 0 0 AS
Dec 2024 53 16 0 0 AS
Nov 2024 50 9 1 0 AS
Oct 2024 48 13 0 0 AS
Sep 2024 48 17 0 0 AS
Aug 2024 56 23 0 0 AS
Jul 2024 62 11 0 0 AS
Jun 2024 60 23 0 0 AS
May 2024 62 11 0 0 AS
Apr 2024 56 14 0 0 AS
Mar 2024 57 13 0 0 AS
Feb 2024 44 6 0 0 AS
Jan 2024 37 10 3 0 AS
Dec 2023 62 9 0 0 AS
Nov 2023 44 5 0 0 AS

SEA–SAT seasonal on-time pattern

Best: February (89.1%) · weakest: June (65.1%)

60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 75.6%

Strongest calendar month

February

89.1% on-time · ~46 flights/mo

Busiest calendar month

February

~46 flights/mo avg

Weakest calendar month

June

65.1% on-time · ~46 flights/mo

Cancellation Rate

0.8%

10 of 1,284 flights

Diversion Rate

0.2%

2 of 1,284 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

SAT - San Antonio

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

SAT on-time profile

Compare the two airports

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

Compare SEA vs SAT

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: San Antonio · fleet on-time rank #3933 of 4927.

What the Data Says About SEA to SAT

The Seattle to San Antonio corridor (SEA to SAT) posts a 77.7% on-time rate on the lower edge of the average band, based on 2,754 tracked flights. Late flights run 48.1 minutes behind on average. 1 carrier cover the 1,774-mile route; over the last 24 months, 10 of 1,284 flights were cancelled (0.8%) and 0.2% diverted.

The monthly split is wide on this route: Dec 2023 posted the strongest performance at 85% on-time, while Aug 2024 came in at just 59% - a 27-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–SAT peaks in February at 89.1% on-time ; the softest month is June at 65.1%, a 24.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to SAT rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to SAT ranks #3411 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 SAT? ▼
Flights from Seattle to San Antonio have a 77.7% on-time rate based on 2,754 flights. The average delay is 48.1 minutes. The best recent month was Dec 2023 with 85% on-time.
What is the cancellation rate for SEA to SAT? ▼
Over the last 24 months, 0.8% of flights on this route were cancelled (10 of 1,284 flights) and 0.2% were diverted.
How far is the flight from SEA to SAT? ▼
The flight distance from Seattle (SEA) to San Antonio (SAT) is approximately 1,774 miles. This route is served by 1 carrier.
When is the best time to fly from SEA to SAT? ▼
The best recent month for on-time performance was Dec 2023 (85% on-time). The worst was Aug 2024 (59% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
SAT Airport

San Antonio
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–SAT data

SEA–SAT is mid-pack at 77.7% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and SAT airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, February (89.1% on-time) beats June (65.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 77.7% 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.