Route · BIL → SEA · 2020–2025 BTS data
Billings to Seattle
The BIL–SEA corridor (Billings, MT → Seattle, WA) runs ahead of the national average, served by 1 carrier across roughly 664 miles.
Data updated 2026-06-13
- 84.2%
- On-time
- +5.2 pts
- vs US avg
- 70 min
- Delay when late
- 1,691
- Flights
Cancelled
1.5%
Best Month
Oct 2021 94%
Worst Month
Feb 2021 59%
Distance
664 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2022 | 62 | 23 | 1 | 1 | QX |
| Nov 2022 | 59 | 16 | 1 | 0 | QX |
| Oct 2022 | 67 | 9 | 0 | 0 | QX |
| Sep 2022 | 84 | 6 | 0 | 0 | QX |
| Aug 2022 | 62 | 6 | 0 | 0 | QX |
| Jul 2022 | 62 | 7 | 0 | 0 | QX |
| Jun 2022 | 60 | 9 | 0 | 0 | QX |
| May 2022 | 62 | 7 | 0 | 0 | QX |
| Apr 2022 | 56 | 11 | 0 | 0 | QX |
| Mar 2022 | 62 | 9 | 0 | 0 | QX |
| Feb 2022 | 56 | 8 | 2 | 1 | QX |
| Jan 2022 | 62 | 14 | 2 | 0 | QX |
| Dec 2021 | 60 | 17 | 5 | 1 | QX |
| Nov 2021 | 60 | 9 | 1 | 2 | QX |
| Oct 2021 | 62 | 4 | 0 | 0 | QX |
| Sep 2021 | 67 | 6 | 0 | 0 | QX |
| Aug 2021 | 93 | 21 | 0 | 0 | QX |
| Jul 2021 | 93 | 11 | 1 | 0 | QX |
| Jun 2021 | 90 | 7 | 1 | 0 | QX |
| May 2021 | 93 | 12 | 0 | 0 | QX |
| Apr 2021 | 90 | 9 | 1 | 0 | QX |
| Mar 2021 | 93 | 7 | 1 | 0 | QX |
| Feb 2021 | 74 | 30 | 7 | 1 | QX |
| Jan 2021 | 62 | 10 | 3 | 1 | QX |
Cancellation Rate
1.5%
26 of 1,691 flights
Diversion Rate
0.4%
7 of 1,691 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BIL - Billings
Full on-time, delay-cause, and seasonal performance for Billings, MT.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See BIL and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to BIL–SEA.
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What the Data Says About BIL to SEA
Bureau of Transportation Statistics records show Billings to Seattle (BIL to SEA) running a 84.2% on-time rate over 1,691 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 69.7 minutes. The 664-mile corridor is served by 1 carrier, and over the last 24 months 1.5% of 1,691 flights were cancelled, 0.4% diverted.
The monthly split is wide on this route: Oct 2021 posted the strongest performance at 94% on-time, while Feb 2021 came in at just 59% - a 34-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.