Route · ALW → SEA · 2020–2025 BTS data
Walla Walla to Seattle
The ALW–SEA corridor (Walla Walla, WA → Seattle, WA) runs ahead of the national average, served by 2 carriers across roughly 213 miles.
Data updated 2026-06-13
- 88.5%
- On-time
- +9.5 pts
- vs US avg
- 68 min
- Delay when late
- 2,217
- Flights
Cancelled
3.2%
Best Month
May 2024 97%
Worst Month
Jan 2024 76%
Distance
213 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Sep 2024 | 60 | 12 | 0 | 0 | OO |
| Aug 2024 | 62 | 12 | 1 | 0 | OO |
| Jul 2024 | 60 | 11 | 0 | 0 | OO |
| Jun 2024 | 60 | 9 | 1 | 0 | OO |
| May 2024 | 60 | 2 | 0 | 0 | OO |
| Apr 2024 | 60 | 2 | 0 | 0 | OO |
| Mar 2024 | 62 | 3 | 0 | 0 | OO |
| Feb 2024 | 58 | 10 | 3 | 0 | OO |
| Jan 2024 | 62 | 15 | 13 | 0 | OO |
| Dec 2023 | 62 | 12 | 9 | 0 | OO |
| Nov 2023 | 59 | 5 | 3 | 1 | OO |
| Oct 2023 | 62 | 8 | 1 | 0 | OO |
| Sep 2023 | 54 | 7 | 0 | 0 | OO |
| Aug 2023 | 31 | 6 | 0 | 0 | OO |
| Jul 2023 | 31 | 3 | 0 | 0 | OO |
| Jun 2023 | 30 | 2 | 0 | 0 | OO |
| Dec 2022 | 31 | 6 | 4 | 0 | QX |
| Oct 2022 | 31 | 1 | 0 | 0 | QX |
| Sep 2022 | 37 | 3 | 0 | 0 | QX |
| Aug 2022 | 62 | 3 | 2 | 0 | QX |
| Jul 2022 | 62 | 3 | 0 | 0 | QX |
| Jun 2022 | 60 | 9 | 0 | 0 | QX |
| May 2022 | 62 | 6 | 1 | 0 | QX |
| Apr 2022 | 60 | 7 | 3 | 0 | QX |
Cancellation Rate
3.2%
41 of 1,278 flights
Diversion Rate
0.1%
1 of 1,278 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ALW - Walla Walla
Full on-time, delay-cause, and seasonal performance for Walla Walla, WA.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See ALW and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to ALW–SEA.
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What the Data Says About ALW to SEA
Walla Walla to Seattle (ALW to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.5% on-time rate across 2,217 flights, with delays that do happen averaging 67.6 minutes. The corridor runs roughly 213 miles and is served by 2 carriers. Over the most recent 24 months, 41 of 1,278 flights were cancelled (3.2%) and 1 diverted (0.1%).
The monthly split is wide on this route: May 2024 posted the strongest performance at 97% on-time, while Jan 2024 came in at just 76% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.
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.