Route · SEA → LWS · 2020–2025 BTS data
Seattle to Lewiston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to LWS (Seattle to Lewiston) ranks #4717 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 88.8%
- On-time
- +9.8 pts
- vs US avg
- 108 min
- Delay when late
- 734
- Flights
- #4717 of 4927
- Corpus placement
Cancelled
0.5%
Best Month
N/A
Worst Month
N/A
Distance
261 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 2 | 0 | 0 | OO |
| Nov 2025 | 30 | 1 | 0 | 0 | OO |
| Oct 2025 | 31 | 2 | 0 | 0 | OO |
| Sep 2025 | 30 | 1 | 0 | 0 | OO |
| Aug 2025 | 30 | 3 | 0 | 0 | OO |
| Jul 2025 | 31 | 2 | 0 | 0 | OO |
| Jun 2025 | 30 | 4 | 0 | 0 | OO |
| May 2025 | 31 | 3 | 0 | 0 | OO |
| Apr 2025 | 30 | 4 | 0 | 0 | OO |
| Mar 2025 | 31 | 5 | 0 | 0 | OO |
| Jan 2025 | 31 | 0 | 0 | 0 | OO |
| Dec 2024 | 31 | 2 | 0 | 0 | OO |
| Nov 2024 | 30 | 2 | 0 | 0 | OO |
| Oct 2024 | 31 | 3 | 0 | 0 | OO |
| Sep 2024 | 30 | 3 | 0 | 0 | OO |
| Aug 2024 | 31 | 7 | 0 | 0 | OO |
| Jul 2024 | 31 | 2 | 0 | 0 | OO |
| Jun 2024 | 30 | 6 | 0 | 0 | OO |
| May 2024 | 31 | 7 | 0 | 0 | OO |
| Apr 2024 | 30 | 2 | 0 | 0 | OO |
| Mar 2024 | 31 | 4 | 0 | 0 | OO |
| Jan 2024 | 31 | 6 | 2 | 0 | OO |
| Dec 2023 | 31 | 4 | 2 | 0 | OO |
| Nov 2023 | 30 | 7 | 0 | 0 | OO |
SEA–LWS seasonal on-time pattern
Best: July (93.5%) · weakest: June (83.3%)
Strongest calendar month
July
93.5% on-time · ~31 flights/mo
Busiest calendar month
January
~31 flights/mo avg
Weakest calendar month
June
83.3% on-time · ~30 flights/mo
Cancellation Rate
0.5%
4 of 734 flights
Diversion Rate
0.0%
0 of 734 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 profileLWS - Lewiston
Full on-time, delay-cause, and seasonal performance for Lewiston, ID.
LWS on-time profileCompare the two airports
See SEA and LWS side by side on delays, cancellations, and reliability.
Compare SEA vs LWSOrigin-hub reliability standing
Among SEA's stronger departures
SEA → LWS posts a 88.8% 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 #284 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–LWS.
Routes with a similar on-time rate
What the Data Says About SEA to LWS
Seattle to Lewiston (SEA to LWS) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.8% on-time rate across 734 flights, with delays that do happen averaging 108.0 minutes. The corridor runs roughly 261 miles and is served by 1 carrier. Over the most recent 24 months, 4 of 734 flights were cancelled (0.5%) and 0 diverted (0.0%).
Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.
On the multi-year calendar, SEA–LWS peaks in July at 93.5% on-time while January carries the heaviest traffic (~31 flights per month) ; the softest month is June at 83.3%, a 10.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SEA to LWS rank among US routes by traffic? ▼
How often are flights delayed from SEA to LWS? ▼
What is the cancellation rate for SEA to LWS? ▼
How far is the flight from SEA to LWS? ▼
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–LWS data
SEA–LWS runs 9.8 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 LWS airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
- If your dates flex, July (93.5% on-time) beats June (83.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 88.8% 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.