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Route on-time record

DEN to JAX: most on-time flights and the best time to fly

Denver (Denver International Airport) to Jacksonville (Jacksonville International Airport). 973 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.0% were cancelled. The most reliable flight number was United 1451 at 9:47 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

DEN → JAX

Denver to Jacksonville: 973 nonstop flights a year

On time (12 months)

76%

Cancelled

0.0%

avg delay 15 min

Best time to leave

9 AM to noon

86% on time vs 72% 3 to 6 PM

Most reliable airline

United

79% chance on time

Check DEN to JAX fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · United 1451

    9:47 AM → 3:17 PM3h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1003; its record covers all of them.

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 88% of the time (245 flights, Jun 2025 to May 2026).
    • Never cancelled in 246 scheduled flights.
    • Leaves in this route's most on-time window (9 AM to noon: 86% on time; 3 to 6 PM: 72%).
    • Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).

    Strong track record · 245 flights

    Find United 1451 fares Opens this date on Aviasales

  2. #2 · United 1485

    4:14 PM → 9:46 PM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 87% of the time (126 flights, Jun 2025 to May 2026).
    • Never cancelled in 126 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 72% on time; 9 AM to noon: 86%).
    • Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.

    Moderate track record · 126 flights

    Find United 1485 fares Opens this date on Aviasales

  3. #3 · United 285

    4:06 PM → 9:21 PM3h 15m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    82%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 79% of the time (24 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 72% on time; 9 AM to noon: 86%).
    • Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find United 285 fares Opens this date on Aviasales

  4. #4 · Southwest 951

    4:15 PM → 9:30 PM3h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    65%

    chance on time

    On time (history)
    60%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 60% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 72% on time; 9 AM to noon: 86%).
    • Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 55 flights

    Find Southwest 951 fares Opens this date on Aviasales

  5. #5 · Southwest 2542

    11:50 AM → 5:00 PM3h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    63%

    chance on time

    On time (history)
    52%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 52% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's most on-time window (9 AM to noon: 86% on time; 3 to 6 PM: 72%).
    • Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 2542 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines79%

    599 flights · 80% on time as flown · 0.0% cancel

  • Southwest Airlines71%

    374 flights · 70% on time as flown · 0.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • 9 AM to noon86%

    311 flights · avg delay 7 min

  • Noon to 3 PM73%

    179 flights · avg delay 16 min

  • 3 to 6 PM72%

    457 flights · avg delay 18 min

Best day: Wednesday (75%). Worst: Sunday (71%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
79
F
80
M
72
A
79
M
74
J
57
J
59
A
61
S
69
O
77
N
81
D
75

What delays this route

  • Late-arriving aircraft45%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume24%
  • Severe weather2%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

Finding the most reliable connections from DEN to JAX…

DEN to JAX questions

What time of day is best to fly DEN to JAX?
9 AM to noon: 86% of flights arrived on time, against 72% for departures 3 to 6 PM.
Which airline is most on time from DEN to JAX?
United, with a season-adjusted 79% chance of operating and arriving on time over 599 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on DEN to JAX?
June (57% on time); the best was November (81%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from DEN

Live status: FAA delays and ground stops