PlainFlights

Route · ALW → SEA · 2020–2025 BTS data

Walla Walla to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ALW to SEA (Walla Walla to Seattle) ranks #3692 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

88.5%
On-time
+9.5 pts
vs US avg
68 min
Delay when late
2,217
Flights
#3692 of 4927
Corpus placement

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

ALW–SEA seasonal on-time pattern

Best: April (94.4%) · weakest: December (82.6%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 82.6%

Strongest calendar month

April

94.4% on-time · ~60 flights/mo

Busiest calendar month

May

~65 flights/mo avg

Weakest calendar month

December

82.6% on-time · ~52 flights/mo

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.

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

Compare ALW vs SEA

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.

On the multi-year calendar, ALW–SEA peaks in April at 94.4% on-time while May carries the heaviest traffic (~65 flights per month) ; the softest month is December at 82.6%, a 11.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ALW to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ALW to SEA ranks #3692 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 ALW to SEA? ▼
Flights from Walla Walla to Seattle have a 88.5% on-time rate based on 2,217 flights. The average delay is 67.6 minutes. The best recent month was May 2024 with 97% on-time.
What is the cancellation rate for ALW to SEA? ▼
Over the last 24 months, 3.2% of flights on this route were cancelled (41 of 1,278 flights) and 0.1% were diverted.
How far is the flight from ALW to SEA? ▼
The flight distance from Walla Walla (ALW) to Seattle (SEA) is approximately 213 miles. This route is served by 2 carriers.
When is the best time to fly from ALW to SEA? ▼
The best recent month for on-time performance was May 2024 (97% on-time). The worst was Jan 2024 (76% on-time). Consider booking during months with historically better performance.

Airports on this route

ALW Airport

Walla Walla
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 ALW–SEA data

ALW–SEA runs 9.5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ALW and SEA airport profiles: delay causes and top routes differ even on the same corridor. ALW airport
  • If your dates flex, April (94.4% on-time) beats December (82.6%) on this corridor. Seasonal chart
  • 4 other routes post a similar 88.5% 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.