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Route on-time record

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

Tucson (Tucson International Airport) to Denver (Denver International Airport). 2,796 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was Southwest 4597 at 6:35 AM.

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

TUS → DEN

Tucson to Denver: 2,796 nonstop flights a year

On time (12 months)

82%

Cancelled

0.8%

avg delay 14 min

Best time to leave

Before 9 AM

93% on time vs 71% 3 to 6 PM

Most reliable airline

SkyWest

83% chance on time

Check TUS to DEN 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 · Southwest 4597

    6:35 AM → 9:25 AM1h 50m nonstop

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

    93%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 71%).
    • Short track record (55 flights), so its score leans on the airline's record at this hour.

    Limited track record · 55 flights

    Find Southwest 4597 fares Opens this date on Aviasales

  2. #2 · SkyWest 5820 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:15 AM → 10:26 AM2h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    92%

    chance on time

    On time (history)
    92%
    Cancelled
    0.5%
    Avg arrival delay
    6 min
    • Arrived on time 92% of the time (185 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 71%).

    Moderate track record · 185 flights

    Find 7:15 AM flight fares Opens this date on Aviasales

  3. #3 · United 1049

    5:45 AM → 8:38 AM1h 53m nonstop

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

    90%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 71%).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 1049 fares Opens this date on Aviasales

  4. #4 · United 1686

    6:00 AM → 8:55 AM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as United 2354; its record covers all of them.

    89%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 89% of the time (56 flights, Jun 2025 to May 2026).
    • Never cancelled in 56 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 71%).
    • Short track record (56 flights), so its score leans on the airline's record at this hour.

    Limited track record · 56 flights

    Find United 1686 fares Opens this date on Aviasales

  5. #5 · Southwest 2659

    6:50 AM → 9:40 AM1h 50m nonstop

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

    89%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 88% 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 (Before 9 AM: 93% on time; 3 to 6 PM: 71%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 2659 fares Opens this date on Aviasales

  6. #6 · SkyWest 6020 · sold as United Express, Delta Connection, American Eagle or Alaska

    5:30 AM → 8:40 AM2h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    88%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 85% of the time (40 flights, Jun 2025 to May 2026).
    • Never cancelled in 41 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 71%).
    • Short track record (40 flights), so its score leans on the airline's record at this hour.

    Limited track record · 40 flights

    Find 5:30 AM flight fares Opens this date on Aviasales

  7. #7 · Southwest 1569

    9:40 AM → 12:35 PM1h 55m nonstop

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

    87%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (15 flights, Jun 2025 to May 2026).
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 1569 fares Opens this date on Aviasales

  8. #8 · SkyWest 5598 · sold as United Express, Delta Connection, American Eagle or Alaska

    9:38 AM → 12:45 PM2h 07m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    1.6%
    Avg arrival delay
    19 min
    • Arrived on time 88% of the time (186 flights, Jun 2025 to May 2026).

    Moderate track record · 186 flights

    Find 9:38 AM flight fares Opens this date on Aviasales

  9. #9 · United 1282

    1:30 PM → 4:39 PM2h 09m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2671; its record covers all of them.

    81%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 83% of the time (109 flights, Jun 2025 to May 2026).
    • Never cancelled in 109 scheduled flights.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.

    Moderate track record · 109 flights

    Find United 1282 fares Opens this date on Aviasales

  10. #10 · Southwest 4598

    10:15 AM → 1:10 PM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    80%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 79% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Short track record (39 flights), so its score leans on the airline's record at this hour.

    Limited track record · 39 flights

    Find Southwest 4598 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)83%

    702 flights · 84% on time as flown · 0.7% cancel

  • United Airlines83%

    781 flights · 85% on time as flown · 0.7% cancel

  • Southwest Airlines80%

    1,209 flights · 80% on time as flown · 0.7% cancel

  • Frontier Airlines79%

    104 flights · 78% on time as flown · 1.6% cancel

On time by departure time

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

  • Before 9 AM93%

    924 flights · avg delay 7 min

  • 9 AM to noon86%

    685 flights · avg delay 13 min

  • Noon to 3 PM74%

    613 flights · avg delay 19 min

  • 3 to 6 PM71%

    560 flights · avg delay 19 min

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
89
F
83
M
85
A
82
M
75
J
73
J
74
A
78
S
89
O
87
N
89
D
88

What delays this route

  • Airline (crew, maintenance, boarding)32%
  • Air traffic control and airport volume31%
  • Late-arriving aircraft30%
  • Severe weather7%

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

TUS to DEN questions

What time of day is best to fly TUS to DEN?
Before 9 AM: 93% of flights arrived on time, against 71% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from TUS to DEN?
SkyWest, with a season-adjusted 83% chance of operating and arriving on time over 702 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 TUS to DEN?
June (73% on time); the best was September (89%), 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 TUS

Live status: FAA delays and ground stops