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Route · SEA → STS · 2020–2025 BTS data

Seattle to Santa Rosa

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to STS (Seattle to Santa Rosa) ranks #3340 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

81.3%
On-time
+2.3 pts
vs US avg
53 min
Delay when late
2,915
Flights
#3340 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Sep 2024 90%

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 12 2 0 AS,OO
Nov 2025 39 1 0 0 OO,AS
Oct 2025 33 3 0 0 AS
Sep 2025 60 8 0 1 AS
Aug 2025 62 13 1 0 OO,AS
Jul 2025 61 23 0 0 AS,OO
Jun 2025 60 28 0 0 AS,OO
May 2025 56 14 0 0 AS,OO
Dec 2024 32 6 0 0 AS,OO
Nov 2024 35 9 0 0 OO,AS
Sep 2024 60 6 0 0 AS
Aug 2024 60 20 0 0 AS,OO
Jul 2024 60 11 0 0 AS,OO
Jun 2024 48 14 0 0 AS,OO
May 2024 31 5 0 1 AS
Apr 2024 30 7 0 0 AS
Mar 2024 31 2 1 0 AS,OO
Jan 2024 31 13 1 1 AS,OO
Dec 2023 31 8 0 1 AS
Nov 2023 50 8 0 0 AS,OO
Oct 2023 49 5 0 0 AS,OO
Sep 2023 60 9 0 0 AS,OO
Aug 2023 62 18 0 0 AS
Jul 2023 48 5 0 0 AS

SEA–STS seasonal on-time pattern

Best: October (88.6%) · weakest: December (70.1%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 70.1%

Strongest calendar month

October

88.6% on-time · ~50 flights/mo

Busiest calendar month

September

~72 flights/mo avg

Weakest calendar month

December

70.1% on-time · ~37 flights/mo

Cancellation Rate

0.4%

5 of 1,119 flights

Diversion Rate

0.4%

4 of 1,119 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

STS - Santa Rosa

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

STS on-time profile

Compare the two airports

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

Compare SEA vs STS

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: Santa Rosa · fleet on-time rank #2635 of 4927.

What the Data Says About SEA to STS

2,915 tracked flights put the SEA to STS pairing (Seattle to Santa Rosa) at a 81.3% on-time rate, squarely in line with the wider network. Delays that do occur run 53.2 minutes on average. Across the 618-mile route and its 9 carriers, the trailing 24 months show 0.4% cancelled and 0.4% diverted (1,119 flights sampled).

The monthly split is wide on this route: Sep 2024 posted the strongest performance at 90% on-time, while Jun 2025 came in at just 53% - a 37-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–STS peaks in October at 88.6% on-time while September carries the heaviest traffic (~72 flights per month) ; the softest month is December at 70.1%, a 18.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to STS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to STS ranks #3340 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 STS? ▼
Flights from Seattle to Santa Rosa have a 81.3% on-time rate based on 2,915 flights. The average delay is 53.2 minutes. The best recent month was Sep 2024 with 90% on-time.
What is the cancellation rate for SEA to STS? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (5 of 1,119 flights) and 0.4% were diverted.
How far is the flight from SEA to STS? ▼
The flight distance from Seattle (SEA) to Santa Rosa (STS) is approximately 618 miles. This route is served by 9 carriers.
When is the best time to fly from SEA to STS? ▼
The best recent month for on-time performance was Sep 2024 (90% on-time). The worst was Jun 2025 (53% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
STS Airport

Santa Rosa
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–STS data

SEA–STS is mid-pack at 81.3% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and STS airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, October (88.6% on-time) beats December (70.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 81.3% 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.