Route · HLN → SEA · 2020–2025 BTS data
Helena to Seattle
The HLN–SEA corridor (Helena, MT → Seattle, WA) runs ahead of the national average, served by 2 carriers across roughly 491 miles.
Data updated 2026-06-13
- 84.8%
- On-time
- +5.8 pts
- vs US avg
- 69 min
- Delay when late
- 677
- Flights
Cancelled
1.3%
Best Month
N/A
Worst Month
N/A
Distance
491 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Jan 2024 | 31 | 8 | 0 | 0 | OO |
| Dec 2023 | 31 | 1 | 1 | 1 | OO |
| Aug 2023 | 31 | 3 | 0 | 0 | OO |
| Jul 2023 | 31 | 4 | 0 | 0 | OO |
| Dec 2022 | 31 | 10 | 1 | 0 | QX |
| Oct 2022 | 31 | 5 | 0 | 0 | QX |
| Sep 2022 | 30 | 6 | 0 | 0 | QX |
| Aug 2022 | 31 | 6 | 0 | 0 | QX |
| Jul 2022 | 31 | 4 | 0 | 0 | QX |
| Jun 2022 | 30 | 4 | 1 | 0 | QX |
| May 2022 | 31 | 8 | 0 | 0 | QX |
| Apr 2022 | 30 | 4 | 1 | 0 | QX |
| Mar 2022 | 31 | 6 | 0 | 0 | QX |
| Jan 2022 | 31 | 7 | 0 | 1 | QX |
| Oct 2021 | 31 | 2 | 0 | 0 | QX |
| Sep 2021 | 30 | 1 | 0 | 0 | QX |
| Aug 2021 | 31 | 6 | 0 | 0 | QX |
| Jul 2021 | 31 | 6 | 1 | 0 | QX |
| May 2021 | 31 | 5 | 1 | 0 | QX |
| Apr 2021 | 30 | 2 | 0 | 0 | QX |
| Mar 2021 | 31 | 4 | 0 | 0 | QX |
| Jan 2021 | 31 | 1 | 3 | 0 | QX |
Cancellation Rate
1.3%
9 of 677 flights
Diversion Rate
0.3%
2 of 677 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
HLN - Helena
Full on-time, delay-cause, and seasonal performance for Helena, MT.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See HLN 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 HLN–SEA.
Routes with a similar on-time rate
What the Data Says About HLN to SEA
Bureau of Transportation Statistics records show Helena to Seattle (HLN to SEA) running a 84.8% on-time rate over 677 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 69.0 minutes. The 491-mile corridor is served by 2 carriers, and over the last 24 months 1.3% of 677 flights were cancelled, 0.3% diverted.
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.
Frequently Asked Questions
How often are flights delayed from HLN to SEA? ▼
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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.