Carrier route record
OOMSO→DEN
SkyWest Airlines · Missoula to Denver
- Flights
- 473
- Period
- September 2025 to August 2026
- Share of route
- 39%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on MSO to DEN lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 473 flights, with a median arrival 4 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate SkyWest on MSO to DEN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.0%
Arrivals under 15 minutes late, of 468 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
1.06%
National rate is 1.89%
Whole route
81.1%
Every carrier on MSO to DEN, 1,198 flights
These figures cover 473 flights between September 2025 and August 2026. The median arrival is 4 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
SkyWest against every carrier on MSO to DEN
SkyWest flew 473 of the 1,198 flights on MSO to DEN, about 39% of it. Its 78.0% on time is 3 points worse than the route as a whole, which runs 81.1%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Frontier at 87.5% to SkyWest at 78.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 8 | 87.5% | 55 min | 0.00% | A+ |
| United Airlines | 717 | 83.1% | 91 min | 0.28% | B+ |
| SkyWest Airlines (this page) | 473 | 78.0% | 98 min | 1.06% | B |
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Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am117 flights91.5%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm356 flights73.5%
- 8pm–5am—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 91.5% of the time, against 73.5% for the evening window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 356 flights scheduled in it.
Across the year
SkyWest on MSO to DEN through the year
December is the weak month at 66.7% on time, against 90.0% in April. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. August was the busiest month here, with 62 flights.
Across the week, Saturday is the strongest day at 83.3% on time and Monday the weakest at 73.2%, a spread of 10 points.
Arrival by arrival
How late SkyWest on MSO to DEN runs when it is late
The 103 late arrivals split 39 under half an hour, 29 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early109 flights23.3%
- Within 15 min256 flights54.7%
- 15–29 min late39 flights8.3%
- 30–59 min late29 flights6.2%
- 1–2 hours late18 flights3.8%
- 2+ hours late17 flights3.6%
Scale runs 0% to 100%.
Share of 468 completed flights by arrival against schedule.
13 of 86 late departures made up the time and arrived on time, 15% of them. In the other direction, 30 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for SkyWest on MSO to DEN
The latest arrival of the period was on 21 July 2026, 26 hours 7 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across July, March, September, October and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 26 hours 7 minutes | Carrier |
| 8 March 2026 | 20 hours 2 minutes | Carrier |
| 11 September 2025 | 14 hours 47 minutes | National Airspace System |
| 18 October 2025 | 6 hours 39 minutes | Extreme weather |
| 13 August 2026 | 5 hours 14 minutes | National Airspace System |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 45% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 30%National Airspace System
- 14%Late-arriving aircraft
- 10%Extreme weather
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,575 of the 10,000 delay minutes reported here. The split is drawn from 10,068 reported delay minutes.
Cancellations sit at 1.06% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
7.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
The 679 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 85.0% on time across 473 flights, 7 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 7 points of difference.
One caution: this is a thin sample. 473 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking SkyWest on MSO to DEN
Put together: treat all of this as provisional. 473 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 78.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 468 completed flights over 12 months sit behind that.
Related
Where to go next
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.