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Route · SEA → SBP · 2020–2025 BTS data

Seattle to San Luis Obispo

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to SBP (Seattle to San Luis Obispo) ranks #3800 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

85.7%
On-time
+6.7 pts
vs US avg
54 min
Delay when late
2,042
Flights
#3800 of 4927
Corpus placement

Cancelled

0.2%

Best Month

Jul 2024 82%

Worst Month

Aug 2024 63%

Distance

847 mi

Carriers

6

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 31 9 0 1 AS
Nov 2025 30 5 0 0 AS
Oct 2025 31 4 1 0 AS
Aug 2025 31 9 0 0 AS
Jul 2025 31 9 0 0 AS
Jun 2025 30 13 0 0 AS
May 2025 31 7 0 0 AS
Apr 2025 30 4 0 1 AS
Mar 2025 31 7 0 0 AS
Jan 2025 31 2 0 0 AS
Dec 2024 31 5 0 0 AS,OO
Nov 2024 30 2 0 0 OO,AS
Oct 2024 31 4 0 0 AS,OO
Sep 2024 55 19 0 1 OO
Aug 2024 60 22 1 0 OO
Jul 2024 62 11 0 0 OO
Jun 2024 37 7 0 0 OO
Apr 2024 38 7 0 0 OO
Dec 2023 31 3 0 0 OO
Nov 2023 30 6 0 0 OO
Oct 2023 31 3 0 0 OO
Sep 2023 30 5 0 0 OO
Aug 2023 31 5 0 0 OO
Jul 2023 31 2 0 0 OO

SEA–SBP seasonal on-time pattern

Best: March (90.7%) · weakest: September (79.0%)

75%80%85%90%95% JanMarAprMayJunJulAugSepOctNovDec 82.8%

Strongest calendar month

March

90.7% on-time · ~36 flights/mo

Busiest calendar month

July

~46 flights/mo avg

Weakest calendar month

September

79.0% on-time · ~40 flights/mo

Cancellation Rate

0.2%

2 of 835 flights

Diversion Rate

0.4%

3 of 835 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

SBP - San Luis Obispo

Full on-time, delay-cause, and seasonal performance for San Luis Obispo, CA.

SBP on-time profile

Compare the two airports

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

Compare SEA vs SBP

Origin-hub reliability standing

Among SEA's stronger departures

SEA → SBP posts a 85.7% on-time rate, landing in the ≥85% band with 25 of 89 BTS-tracked routes leaving Seattle. The same hub also shows 63 mid-band and 1 challenged departures · fleet-wide on-time rank #1004 of 4927 (highest on-time = #1).

What the Data Says About SEA to SBP

Seattle to San Luis Obispo (SEA to SBP) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.7% on-time rate across 2,042 flights, with delays that do happen averaging 53.7 minutes. The corridor runs roughly 847 miles and is served by 6 carriers. Over the most recent 24 months, 2 of 835 flights were cancelled (0.2%) and 3 diverted (0.4%).

The monthly split is wide on this route: Jul 2024 posted the strongest performance at 82% on-time, while Aug 2024 came in at just 63% - a 19-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–SBP peaks in March at 90.7% on-time while July carries the heaviest traffic (~46 flights per month) ; the softest month is September at 79.0%, a 11.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to SBP rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to SBP ranks #3800 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 SBP? ▼
Flights from Seattle to San Luis Obispo have a 85.7% on-time rate based on 2,042 flights. The average delay is 53.7 minutes. The best recent month was Jul 2024 with 82% on-time.
What is the cancellation rate for SEA to SBP? ▼
Over the last 24 months, 0.2% of flights on this route were cancelled (2 of 835 flights) and 0.4% were diverted.
How far is the flight from SEA to SBP? ▼
The flight distance from Seattle (SEA) to San Luis Obispo (SBP) is approximately 847 miles. This route is served by 6 carriers.
When is the best time to fly from SEA to SBP? ▼
The best recent month for on-time performance was Jul 2024 (82% on-time). The worst was Aug 2024 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
SBP Airport

San Luis Obispo
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–SBP data

SEA–SBP runs 6.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and SBP airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, March (90.7% on-time) beats September (79.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 85.7% 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.