Route · SEA → BIL · 2020–2025 BTS data
Seattle to Billings
The SEA–BIL corridor (Seattle, WA → Billings, MT) runs ahead of the national average, served by 1 carrier across roughly 664 miles.
Data updated 2026-06-13
- 85.8%
- On-time
- +6.8 pts
- vs US avg
- 56 min
- Delay when late
- 1,691
- Flights
Cancelled
1.2%
Best Month
Apr 2021 97%
Worst Month
Dec 2022 68%
Distance
664 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2022 | 62 | 20 | 2 | 0 | QX |
| Nov 2022 | 59 | 14 | 1 | 0 | QX |
| Oct 2022 | 67 | 9 | 0 | 0 | QX |
| Sep 2022 | 84 | 17 | 0 | 0 | QX |
| Aug 2022 | 62 | 7 | 0 | 0 | QX |
| Jul 2022 | 62 | 5 | 0 | 0 | QX |
| Jun 2022 | 60 | 10 | 0 | 1 | QX |
| May 2022 | 62 | 12 | 0 | 0 | QX |
| Apr 2022 | 56 | 14 | 0 | 0 | QX |
| Mar 2022 | 62 | 9 | 0 | 0 | QX |
| Feb 2022 | 56 | 8 | 2 | 0 | QX |
| Jan 2022 | 63 | 15 | 2 | 0 | QX |
| Dec 2021 | 60 | 12 | 5 | 1 | QX |
| Nov 2021 | 59 | 4 | 0 | 1 | QX |
| Oct 2021 | 62 | 6 | 0 | 0 | QX |
| Sep 2021 | 67 | 12 | 0 | 0 | QX |
| Aug 2021 | 93 | 15 | 1 | 1 | QX |
| Jul 2021 | 93 | 9 | 0 | 0 | QX |
| Jun 2021 | 90 | 11 | 1 | 0 | QX |
| May 2021 | 93 | 4 | 0 | 2 | QX |
| Apr 2021 | 90 | 3 | 0 | 0 | QX |
| Mar 2021 | 93 | 9 | 0 | 0 | QX |
| Feb 2021 | 74 | 9 | 4 | 0 | QX |
| Jan 2021 | 62 | 6 | 3 | 0 | QX |
Cancellation Rate
1.2%
21 of 1,691 flights
Diversion Rate
0.4%
6 of 1,691 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.
Origin airport →BIL - Billings
Full on-time, delay-cause, and seasonal performance for Billings, MT.
Destination airport →Compare the two airports
See SEA and BIL side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–BIL.
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What the Data Says About SEA to BIL
Seattle to Billings (SEA to BIL) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.8% on-time rate across 1,691 flights, with delays that do happen averaging 56.0 minutes. The corridor runs roughly 664 miles and is served by 1 carrier. Over the most recent 24 months, 21 of 1,691 flights were cancelled (1.2%) and 6 diverted (0.4%).
The monthly split is wide on this route: Apr 2021 posted the strongest performance at 97% on-time, while Dec 2022 came in at just 68% - a 29-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to BIL? ▼
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Flight Guides
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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.
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.