SEA to HLN flight delays
Seattle, WA (SEA) Helena, MT (HLN) · 491 miles
90 flights · July 2024 – July 2026 · US Bureau of Transportation Statistics
76.4%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
46 min
When late, late by
Average across delayed arrivals
12 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The two directions do not behave alike. HLN to SEA arrives on time 9 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The Seattle to Helena route sits close to the middle of the record — neither notably punctual nor notably late.
Every airline on SEA to HLN
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 90 | 76.4% | 0% | 46 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
HLN to SEA Helena back to Seattle 67.42% on time —Other routes from Seattle
Common questions
Are flights from Seattle to Helena usually delayed?
76.4% of flights on the SEA to HLN route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
How often are SEA to HLN flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When SEA to HLN flights are late, how late are they?
About 46 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SEA to HLN during July 2024 – July 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →