Route · SEA → ALW · 2020–2025 BTS data
Seattle to Walla Walla
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to ALW (Seattle to Walla Walla) ranks #3694 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 87.3%
- On-time
- +8.3 pts
- vs US avg
- 55 min
- Delay when late
- 2,216
- Flights
- #3694 of 4927
- Corpus placement
Cancelled
3.1%
Best Month
Nov 2023 97%
Worst Month
Sep 2024 64%
Distance
213 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Sep 2024 | 59 | 21 | 0 | 0 | OO |
| Aug 2024 | 62 | 21 | 1 | 0 | OO |
| Jul 2024 | 60 | 14 | 0 | 0 | OO |
| Jun 2024 | 60 | 10 | 1 | 0 | OO |
| May 2024 | 60 | 6 | 0 | 0 | OO |
| Apr 2024 | 60 | 4 | 0 | 0 | OO |
| Mar 2024 | 62 | 4 | 0 | 0 | OO |
| Feb 2024 | 58 | 3 | 3 | 0 | OO |
| Jan 2024 | 62 | 10 | 12 | 0 | OO |
| Dec 2023 | 62 | 8 | 11 | 2 | OO |
| Nov 2023 | 59 | 2 | 3 | 1 | OO |
| Oct 2023 | 62 | 6 | 1 | 0 | OO |
| Sep 2023 | 55 | 5 | 0 | 0 | OO |
| Aug 2023 | 31 | 4 | 0 | 0 | OO |
| Jul 2023 | 31 | 2 | 0 | 0 | OO |
| Jun 2023 | 30 | 5 | 0 | 0 | OO |
| Dec 2022 | 31 | 5 | 4 | 0 | QX |
| Oct 2022 | 31 | 1 | 0 | 0 | QX |
| Sep 2022 | 36 | 2 | 0 | 0 | QX |
| Aug 2022 | 62 | 10 | 1 | 0 | QX |
| Jul 2022 | 62 | 5 | 1 | 0 | QX |
| Jun 2022 | 60 | 12 | 0 | 0 | QX |
| May 2022 | 62 | 6 | 1 | 0 | QX |
| Apr 2022 | 60 | 8 | 1 | 0 | QX |
SEA–ALW seasonal on-time pattern
Best: March (94.6%) · weakest: August (78.8%)
Strongest calendar month
March
94.6% on-time · ~62 flights/mo
Busiest calendar month
May
~65 flights/mo avg
Weakest calendar month
August
78.8% on-time · ~54 flights/mo
Cancellation Rate
3.1%
40 of 1,277 flights
Diversion Rate
0.2%
3 of 1,277 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 profileALW - Walla Walla
Full on-time, delay-cause, and seasonal performance for Walla Walla, WA.
ALW on-time profileCompare the two airports
See SEA and ALW side by side on delays, cancellations, and reliability.
Compare SEA vs ALWOrigin-hub reliability standing
Among SEA's stronger departures
SEA → ALW posts a 87.3% 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 #579 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–ALW.
Routes with a similar on-time rate
What the Data Says About SEA to ALW
Seattle to Walla Walla (SEA to ALW) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.3% on-time rate across 2,216 flights, with delays that do happen averaging 54.9 minutes. The corridor runs roughly 213 miles and is served by 2 carriers. Over the most recent 24 months, 40 of 1,277 flights were cancelled (3.1%) and 3 diverted (0.2%).
The monthly split is wide on this route: Nov 2023 posted the strongest performance at 97% on-time, while Sep 2024 came in at just 64% - a 32-point swing worth factoring into travel timing.
On the multi-year calendar, SEA–ALW peaks in March at 94.6% on-time while May carries the heaviest traffic (~65 flights per month) ; the softest month is August at 78.8%, a 15.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SEA to ALW rank among US routes by traffic? ▼
How often are flights delayed from SEA to ALW? ▼
What is the cancellation rate for SEA to ALW? ▼
How far is the flight from SEA to ALW? ▼
When is the best time to fly from SEA to ALW? ▼
Airports on this route
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–ALW data
SEA–ALW runs 8.3 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 ALW airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
- If your dates flex, March (94.6% on-time) beats August (78.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 87.3% 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.
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.