Jacksonville (JAX) to Denver (DEN): On-Time Performance
Data through July 2026
When you fly JAX to DEN matters as much as anything else about the booking: the route swung from 98% on-time in October 2024 to just 60% in June 2026. Across the full period the route averages 85% on-time against a national 78%.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 2.8
- last 12 months
- Duration
- 3h 53m
- scheduled
- Distance
- 1,446 mi
Best airline from JAX to DEN
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 86% | 12 min | 0.4% | 1,219 |
| Southwest Airlines | 82% | 11 min | 0.6% | 783 |
Monthly on-time trend
Best time to fly from JAX to DEN
Aim for departures around 6 a.m. (100% on-time); avoid 5 p.m. departures (46%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 87% | 8 min |
| Tuesday | 86% | 8 min |
| Wednesdaybest | 88% | 8 min |
| Thursday | 85% | 10 min |
| Friday | 81% | 17 min |
| Saturday | 84% | 12 min |
| Sunday | 81% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations33%
- National airspace system27%
- Weather5%
Frequently asked questions
- How often are flights from JAX to DEN delayed?
- 16% of JAX–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 11 minutes.
- Which airline is most reliable from JAX to DEN?
- United Airlines has the best on-time record on this route at 86%, based on 1,219 flights. 2 airlines flew JAX–DEN frequently enough to compare in this period.
- What is the best time of day to fly from JAX to DEN?
- Departures around 6 a.m. have the best record (100% on-time), while departures around 5 p.m. have the worst (46%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JAX to DEN?
- The scheduled JAX–DEN flight time averages 3h 53m over 1,446 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are JAX to DEN flights cancelled?
- 0.5% 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 JAX to DEN?
- June 2026 was the roughest month in this dataset, with only 60% of arrivals on time. The best was October 2024 at 98%. If your dates are flexible, that 38-point gap is worth planning around.
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Based on 2,002 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.