Denver (DEN) to Billings (BIL): On-Time Performance
Data through May 2026
The calendar drives reliability on DEN–BIL. October 2025 flights landed on schedule 91% of the time, but July 2025 dropped to 61% — a gap of 30 points. Across the full period the route averages 78% on-time against a national 78%.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 4.9
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 455 mi
Best airline from DEN to BIL
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 80% | 13 min | 1.3% | 1,969 |
| United Airlines | 75% | 16 min | 0.2% | 1,463 |
Monthly on-time trend
Best time to fly from DEN to BIL
Aim for departures around 7 a.m. (98% on-time); avoid 8 p.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 15 min |
| Tuesday | 78% | 15 min |
| Wednesdaybest | 83% | 11 min |
| Thursday | 76% | 14 min |
| Friday | 77% | 16 min |
| Saturday | 78% | 15 min |
| Sunday | 76% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft48%
- Airline operations37%
- National airspace system11%
- Weather4%
Frequently asked questions
- How often are flights from DEN to BIL delayed?
- 22% of DEN–BIL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from DEN to BIL?
- SkyWest Airlines has the best on-time record on this route at 80%, based on 1,969 flights. 2 airlines flew DEN–BIL frequently enough to compare in this period.
- What is the best time of day to fly from DEN to BIL?
- Departures around 7 a.m. have the best record (98% on-time), while departures around 8 p.m. have the worst (56%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to BIL?
- The scheduled DEN–BIL flight time averages 1h 38m over 455 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are DEN to BIL flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from DEN to BIL?
- July 2025 was the roughest month in this dataset, with only 61% of arrivals on time. The best was October 2025 at 91%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 3,432 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.