90% of flights from Seattle to Lewiston arrived on time over the past 12 months. That is better than the typical U.S. route. The 7 p.m. departures ran on time 94% of the time; the 9 p.m. ones 87%. 2% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SEA → LWS: when a flight was late, it was under 45 minutes late 71% of the time. About 1 in 46 flights landed an hour or more late, and 1 in 122 three hours or more; 0.3% were cancelled outright.
- On time or early90%
- 15–30 min late4.1%
- 30–60 min late3.0%
- 1–2 hours late1.1%
- 2–3 hours late0.3%
- 3+ hours late0.8%
- Diverted0.0%
- Cancelled0.3%
Share of all 365 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 365 | 90% | 0.3% | −14 min | 2.2% | +96 min | SkyWest |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SEA). Delays build through the day as late planes knock on, so early flights usually do best.
By month
Each calendar month pooled over 2023–2026.
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 53 | — | — |
| Tuesday | 52 | — | — |
| Wednesday | 52 | — | — |
| Thursday | 52 | — | — |
| Friday | 52 | — | — |
| Saturday | 52 | — | — |
| Sunday | 52 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 1
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 3873 | 7:45 p.m. | 365 | 90% | 0.3% | −14 min | SkyWest |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Seattle or Lewiston. None has been clearly more reliable than SEA → LWS.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SEA → LWS (this route) | 365 | 90% | 0.3% |
| SEA → PUW Seattle-Tacoma to Pullman-Moscow | 1,051 | 84% | 1.6% |
Questions
How often are flights from SEA to LWS on time?
90% of 365 scheduled flights from Seattle, WA to Lewiston, ID arrived within 15 minutes of schedule between September 2025 and August 2026. 0.3% were cancelled.
What is the best time of day to fly SEA to LWS?
Flights scheduled to leave at 7 p.m. were the most reliable (94% on time). The 9 p.m. departures were the least (87%).
Related
- LWS → SEA (return)
- Seattle-Tacoma (SEA) delays by hour
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.