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Route on-time record

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

Cleveland (Cleveland Hopkins International Airport) to Denver (Denver International Airport). 1,835 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 0.4% were cancelled. The most reliable flight number was Southwest 727 at 6:30 AM.

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

CLE → DEN

Cleveland to Denver: 1,835 nonstop flights a year

On time (12 months)

81%

Cancelled

0.4%

avg delay 13 min

Best time to leave

Before 9 AM

93% on time vs 53% 6 to 9 PM

Most reliable airline

United

87% chance on time

Check CLE to DEN fares

Lowest nonstop fare seen in the next two months: $138 (United 690 on 2026-11-07). 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 727

    6:30 AM → 7:45 AM3h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2832; its record covers all of them.

    95%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (68 flights, Jun 2025 to May 2026).
    • Never cancelled in 68 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 53%).

    Moderate track record · 68 flights

    Find Southwest 727 fares Opens this date on Aviasales

  2. #2 · United 1219

    9:00 AM → 10:15 AM3h 15m nonstop

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

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 1219 fares Opens this date on Aviasales

  3. #3 · United 690

    8:30 AM → 9:58 AM3h 29m nonstop

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

    90%

    chance on time

    On time (history)
    91%
    Cancelled
    0.4%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (236 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 53%).

    Strong track record · 236 flights

    Find United 690 fares Opens this date on Aviasales

  4. #4 · United 2246

    11:10 AM → 12:26 PM3h 16m nonstop

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

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 2246 fares Opens this date on Aviasales

  5. #5 · United 486

    4:40 PM → 6:09 PM3h 29m nonstop

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

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 83% of the time (338 flights, Jun 2025 to May 2026).
    • Never cancelled in 339 scheduled flights.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 338 flights

    Find United 486 fares Opens this date on Aviasales

  6. #6 · Southwest 2024

    6:20 AM → 7:40 AM3h 20m nonstop

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

    83%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 76% of the time (67 flights, Jun 2025 to May 2026).
    • Never cancelled in 68 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 53%).

    Moderate track record · 67 flights

    Find Southwest 2024 fares Opens this date on Aviasales

  7. #7 · Frontier 4639

    12:47 PM → 2:13 PM3h 26m nonstop

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

    68%

    chance on time

    On time (history)
    67%
    Cancelled
    0.8%
    Avg arrival delay
    22 min
    • Arrived on time 67% of the time (126 flights, Jun 2025 to May 2026).
    • 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 · 126 flights

    Find Frontier 4639 fares Opens this date on Aviasales

  8. #8 · Southwest 3856

    6:15 PM → 7:30 PM3h 15m nonstop

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

    60%

    chance on time

    On time (history)
    63%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 53% on time; Before 9 AM: 93%).
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 3856 fares Opens this date on Aviasales

  9. #9 · Frontier 4637

    8:51 PM → 10:17 PM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-04-15.

    58%

    chance on time

    On time (history)
    61%
    Cancelled
    1.9%
    Avg arrival delay
    27 min
    • Arrived on time 61% of the time (152 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 53% on time; Before 9 AM: 93%).
    • 55% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 152 flights

    Find Frontier 4637 fares Opens this date on Aviasales

  10. #10 · Southwest 1336

    6:40 PM → 7:55 PM3h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 503; its record covers all of them.

    50%

    chance on time

    On time (history)
    45%
    Cancelled
    0.0%
    Avg arrival delay
    36 min
    • Arrived on time 45% of the time (62 flights, Jun 2025 to May 2026).
    • Never cancelled in 62 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 53% on time; Before 9 AM: 93%).
    • 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 · 62 flights

    Find Southwest 1336 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines87%

    939 flights · 87% on time as flown · 0.1% cancel

  • Southwest Airlines79%

    604 flights · 79% on time as flown · 0.3% cancel

  • Frontier Airlines67%

    292 flights · 64% on time as flown · 1.0% cancel

On time by departure time

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

  • Before 9 AM93%

    567 flights · avg delay 5 min

  • 9 AM to noon90%

    318 flights · avg delay 7 min

  • Noon to 3 PM87%

    130 flights · avg delay 7 min

  • 3 to 6 PM76%

    532 flights · avg delay 16 min

  • 6 to 9 PM53%

    285 flights · avg delay 33 min

Best day: Wednesday (85%). Worst: Saturday (79%).

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
77
F
85
M
83
A
82
M
81
J
72
J
73
A
81
S
92
O
88
N
89
D
85

What delays this route

  • Late-arriving aircraft40%
  • Air traffic control and airport volume37%
  • Airline (crew, maintenance, boarding)19%
  • Severe weather3%

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

CLE to DEN questions

What time of day is best to fly CLE to DEN?
Before 9 AM: 93% of flights arrived on time, against 53% for departures 6 to 9 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 CLE to DEN?
United, with a season-adjusted 87% chance of operating and arriving on time over 939 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 CLE to DEN?
June (72% on time); the best was September (92%), 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 CLE

Live status: FAA delays and ground stops