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Route · STS → SEA · 2020–2025 BTS data

Santa Rosa to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STS to SEA (Santa Rosa to Seattle) ranks #3341 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

80.1%
On-time
+1.1 pts
vs US avg
59 min
Delay when late
2,915
Flights
#3341 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Sep 2023 87%

Worst Month

Jun 2025 53%

Distance

618 mi

Carriers

9

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 30 13 2 0 AS,OO
Nov 2025 39 7 1 0 OO,AS
Oct 2025 34 3 0 0 AS
Sep 2025 60 16 0 0 AS
Aug 2025 62 25 1 0 OO,AS
Jul 2025 61 26 1 0 AS,OO
Jun 2025 60 28 1 1 AS,OO
May 2025 56 25 0 0 AS,OO
Dec 2024 32 6 0 0 AS,OO
Nov 2024 35 9 0 0 OO,AS
Sep 2024 59 18 1 0 AS
Aug 2024 61 21 0 0 AS,OO
Jul 2024 60 11 0 0 AS,OO
Jun 2024 47 16 0 0 AS,OO
May 2024 32 5 0 0 AS,OO
Apr 2024 30 5 0 0 AS
Mar 2024 31 2 1 0 AS,OO
Jan 2024 31 5 1 0 AS,OO
Dec 2023 31 7 1 0 AS
Nov 2023 50 8 0 0 AS,OO
Oct 2023 49 14 0 0 AS,OO
Sep 2023 60 8 0 0 AS,OO
Aug 2023 62 17 0 0 AS
Jul 2023 48 9 1 0 AS

STS–SEA seasonal on-time pattern

Best: January (86.8%) · weakest: December (71.4%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 71.4%

Strongest calendar month

January

86.8% on-time · ~41 flights/mo

Busiest calendar month

September

~71 flights/mo avg

Weakest calendar month

December

71.4% on-time · ~37 flights/mo

Cancellation Rate

1.0%

11 of 1,120 flights

Diversion Rate

0.1%

1 of 1,120 flights

Explore origin & destination

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

STS - Santa Rosa

Full on-time, delay-cause, and seasonal performance for Santa Rosa, CA.

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

Compare STS vs SEA

Origin-hub reliability standing

Mid-pack among STS departures

From STS, this corridor sits with 7 other 75–85% on-time routes out of 8 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 0 below 75%). Destination: Seattle · fleet on-time rank #3120 of 4927.

What the Data Says About STS to SEA

2,915 tracked flights put the STS to SEA pairing (Santa Rosa to Seattle) at a 80.1% on-time rate, squarely in line with the wider network. Delays that do occur run 58.6 minutes on average. Across the 618-mile route and its 9 carriers, the trailing 24 months show 1.0% cancelled and 0.1% diverted (1,120 flights sampled).

The monthly split is wide on this route: Sep 2023 posted the strongest performance at 87% on-time, while Jun 2025 came in at just 53% - a 33-point swing worth factoring into travel timing.

On the multi-year calendar, STS–SEA peaks in January at 86.8% on-time while September carries the heaviest traffic (~71 flights per month) ; the softest month is December at 71.4%, a 15.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does STS to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, STS to SEA ranks #3341 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 STS to SEA? ▼
Flights from Santa Rosa to Seattle have a 80.1% on-time rate based on 2,915 flights. The average delay is 58.6 minutes. The best recent month was Sep 2023 with 87% on-time.
What is the cancellation rate for STS to SEA? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (11 of 1,120 flights) and 0.1% were diverted.
How far is the flight from STS to SEA? ▼
The flight distance from Santa Rosa (STS) to Seattle (SEA) is approximately 618 miles. This route is served by 9 carriers.
When is the best time to fly from STS to SEA? ▼
The best recent month for on-time performance was Sep 2023 (87% on-time). The worst was Jun 2025 (53% on-time). Consider booking during months with historically better performance.

Airports on this route

STS Airport

Santa Rosa
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 STS–SEA data

STS–SEA is mid-pack at 80.1% on-time; month and carrier mix move more than the corridor headline.

  • Compare STS and SEA airport profiles: delay causes and top routes differ even on the same corridor. STS airport
  • If your dates flex, January (86.8% on-time) beats December (71.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 80.1% 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.