Route · SEA → HLN · 2020–2025 BTS data
Seattle to Helena
The SEA–HLN corridor (Seattle, WA → Helena, MT) runs ahead of the national average, served by 2 carriers across roughly 491 miles.
Data updated 2026-06-13
- 86.7%
- On-time
- +7.7 pts
- vs US avg
- 57 min
- Delay when late
- 677
- Flights
Cancelled
0.6%
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 | 6 | 0 | 0 | OO |
| Dec 2023 | 31 | 2 | 0 | 1 | OO |
| Aug 2023 | 31 | 1 | 0 | 0 | OO |
| Jul 2023 | 31 | 3 | 0 | 0 | OO |
| Dec 2022 | 31 | 10 | 1 | 0 | QX |
| Oct 2022 | 31 | 4 | 0 | 0 | QX |
| Sep 2022 | 30 | 6 | 0 | 1 | QX |
| Aug 2022 | 31 | 3 | 0 | 0 | QX |
| Jul 2022 | 31 | 3 | 0 | 0 | QX |
| Jun 2022 | 30 | 7 | 0 | 0 | QX |
| May 2022 | 31 | 6 | 0 | 0 | QX |
| Apr 2022 | 30 | 2 | 1 | 0 | QX |
| Mar 2022 | 31 | 3 | 0 | 0 | QX |
| Jan 2022 | 31 | 7 | 0 | 0 | QX |
| Oct 2021 | 31 | 1 | 0 | 0 | QX |
| Sep 2021 | 30 | 1 | 0 | 0 | QX |
| Aug 2021 | 31 | 6 | 0 | 0 | QX |
| Jul 2021 | 31 | 7 | 0 | 0 | QX |
| May 2021 | 31 | 3 | 1 | 0 | QX |
| Apr 2021 | 30 | 2 | 0 | 0 | QX |
| Mar 2021 | 31 | 4 | 0 | 0 | QX |
| Jan 2021 | 31 | 3 | 1 | 0 | QX |
Cancellation Rate
0.6%
4 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.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →HLN - Helena
Full on-time, delay-cause, and seasonal performance for Helena, MT.
Destination airport →Compare the two airports
See SEA and HLN 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–HLN.
Routes with a similar on-time rate
What the Data Says About SEA to HLN
Seattle to Helena (SEA to HLN) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.7% on-time rate across 677 flights, with delays that do happen averaging 56.5 minutes. The corridor runs roughly 491 miles and is served by 2 carriers. Over the most recent 24 months, 4 of 677 flights were cancelled (0.6%) and 2 diverted (0.3%).
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 SEA to HLN? ▼
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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.