Seattle (SEA) to Lewiston (LWS): On-Time Performance
Data through July 2026
Seattle (SEA) to Lewiston (LWS) is a thinner route than most in this dataset — 364 departures over the past year, roughly 7 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 91% arrived on time, comfortably above the national average of 78%.
- On-time
- 91%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 1.00
- last 12 months
- Duration
- 1h 18m
- scheduled
- Distance
- 262 mi
Monthly on-time trend
Best time to fly from SEA to LWS
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 93% | 9 min |
| Tuesdaybest | 96% | 3 min |
| Wednesday | 92% | 5 min |
| Thursday | 87% | 7 min |
| Friday | 90% | 12 min |
| Saturday | 90% | 5 min |
| Sunday | 86% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Airline operations69%
- National airspace system4%
- Weather27%
Frequently asked questions
- How often are flights from SEA to LWS delayed?
- 10% of SEA–LWS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 7 minutes.
- How long is the flight from SEA to LWS?
- The scheduled SEA–LWS flight time averages 1h 18m over 262 miles. Actual arrival times vary — flights on this route land 15+ minutes late 10% of the time.
- How often are SEA to LWS flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to LWS?
- August 2024 was the roughest month in this dataset, with only 77% of arrivals on time. The best was January 2025 at 100%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 760 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.