Great Falls (GTF) to Denver (DEN): On-Time Performance
Data through July 2026
The calendar drives reliability on GTF–DEN. December 2024 flights landed on schedule 95% of the time, but January 2025 dropped to 71% — a gap of 24 points. Across the full period the route averages 84% on-time against a national 78%.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 2.0
- last 12 months
- Duration
- 2h 5m
- scheduled
- Distance
- 623 mi
Best airline from GTF to DEN
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 87% | 11 min | 0.6% | 656 |
| United Airlines | 82% | 19 min | 1.2% | 863 |
Monthly on-time trend
Best time to fly from GTF to DEN
Aim for departures around 6 a.m. (91% on-time); avoid 2 p.m. departures (78%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 86% | 12 min |
| Tuesday | 81% | 15 min |
| Wednesday | 84% | 12 min |
| Thursday | 86% | 23 min |
| Friday | 81% | 16 min |
| Saturday | 86% | 16 min |
| Sundaybest | 87% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft23%
- Airline operations30%
- National airspace system30%
- Weather18%
Frequently asked questions
- How often are flights from GTF to DEN delayed?
- 16% of GTF–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from GTF to DEN?
- SkyWest Airlines has the best on-time record on this route at 87%, based on 656 flights. 2 airlines flew GTF–DEN frequently enough to compare in this period.
- What is the best time of day to fly from GTF to DEN?
- Departures around 6 a.m. have the best record (91% on-time), while departures around 2 p.m. have the worst (78%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from GTF to DEN?
- The scheduled GTF–DEN flight time averages 2h 5m over 623 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are GTF to DEN flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from GTF to DEN?
- January 2025 was the roughest month in this dataset, with only 71% of arrivals on time. The best was December 2024 at 95%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 1,519 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.