Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

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

Colorado Springs (City of Colorado Springs Municipal Airport) to Denver (Denver International Airport). 5,059 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was SkyWest 4677 at 7:40 AM.

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

COS → DEN

Colorado Springs to Denver: 5,059 nonstop flights a year

On time (12 months)

77%

Cancelled

1.5%

avg delay 17 min

Best time to leave

Before 9 AM

86% on time vs 59% 3 to 6 PM

Most reliable airline

SkyWest

78% chance on time

Check COS 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 · SkyWest 4677 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:40 AM → 8:47 AM1h 07m nonstop

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

    90%

    chance on time

    On time (history)
    94%
    Cancelled
    1.9%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (152 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 3 to 6 PM: 59%).

    Moderate track record · 152 flights

    Find 7:40 AM flight fares Opens this date on Aviasales

  2. #2 · Southwest 1989

    6:35 AM → 7:30 AM55m nonstop

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

    88%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 94% 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: 86% on time; 3 to 6 PM: 59%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 1989 fares Opens this date on Aviasales

  3. #3 · SkyWest 5559 · sold as United Express, Delta Connection, American Eagle or Alaska

    5:30 AM → 6:35 AM1h 05m nonstop

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

    87%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (10 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 3 to 6 PM: 59%).
    • Short track record (10 flights), so its score leans on the airline's record at this hour.

    Limited track record · 10 flights

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

  4. #4 · Southwest 2733

    6:45 AM → 7:40 AM55m 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 (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: 86% on time; 3 to 6 PM: 59%).
    • Short track record (55 flights), so its score leans on the airline's record at this hour.

    Limited track record · 55 flights

    Find Southwest 2733 fares Opens this date on Aviasales

  5. #5 · SkyWest 4696 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:00 AM → 8:07 AM1h 07m nonstop

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

    87%

    chance on time

    On time (history)
    88%
    Cancelled
    0.6%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (313 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 3 to 6 PM: 59%).

    Strong track record · 313 flights

    Find 7:00 AM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 5291 · sold as United Express, Delta Connection, American Eagle or Alaska

    6:00 AM → 7:05 AM1h 05m nonstop

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

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.6%
    Avg arrival delay
    10 min
    • Arrived on time 87% of the time (322 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 3 to 6 PM: 59%).

    Strong track record · 322 flights

    Find 6:00 AM flight fares Opens this date on Aviasales

  7. #7 · SkyWest 5620 · sold as United Express, Delta Connection, American Eagle or Alaska

    12:56 PM → 2:02 PM1h 06m nonstop

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

    83%

    chance on time

    On time (history)
    89%
    Cancelled
    5.7%
    Avg arrival delay
    13 min
    • Arrived on time 89% of the time (66 flights, Jun 2025 to May 2026).
    • Cancelled 5.7% of the time (4 of 70).
    • 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 · 66 flights

    Find 12:56 PM flight fares Opens this date on Aviasales

  8. #8 · United 1055

    1:33 PM → 2:40 PM1h 07m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 324; its record covers all of them.

    81%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 86% of the time (133 flights, Jun 2025 to May 2026).
    • Never cancelled in 133 scheduled flights.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • 69% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 133 flights

    Find United 1055 fares Opens this date on Aviasales

  9. #9 · SkyWest 5634 · sold as United Express, Delta Connection, American Eagle or Alaska

    9:30 AM → 10:34 AM1h 05m nonstop

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

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    0.6%
    Avg arrival delay
    14 min
    • Arrived on time 82% of the time (346 flights, Jun 2025 to May 2026).

    Strong track record · 346 flights

    Find 9:30 AM flight fares Opens this date on Aviasales

  10. #10 · SkyWest 5400 · sold as United Express, Delta Connection, American Eagle or Alaska

    10:28 AM → 11:35 AM1h 07m nonstop

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

    80%

    chance on time

    On time (history)
    84%
    Cancelled
    0.9%
    Avg arrival delay
    15 min
    • Arrived on time 84% of the time (108 flights, Jun 2025 to May 2026).

    Moderate track record · 108 flights

    Find 10:28 AM flight 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)78%

    3,259 flights · 80% on time as flown · 1.8% cancel

  • Southwest Airlines74%

    1,155 flights · 75% on time as flown · 0.6% cancel

  • United Airlines70%

    645 flights · 71% on time as flown · 1.4% cancel

On time by departure time

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

  • Before 9 AM86%

    1,732 flights · avg delay 10 min

  • 9 AM to noon81%

    1,291 flights · avg delay 13 min

  • Noon to 3 PM82%

    685 flights · avg delay 14 min

  • 3 to 6 PM59%

    984 flights · avg delay 31 min

  • 6 to 9 PM61%

    367 flights · avg delay 36 min

Best day: Tuesday (81%). Worst: Friday (76%).

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
81
M
84
A
77
M
77
J
72
J
72
A
74
S
84
O
83
N
85
D
83

What delays this route

  • Air traffic control and airport volume35%
  • Airline (crew, maintenance, boarding)30%
  • Late-arriving aircraft28%
  • Severe weather8%

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

COS to DEN questions

What time of day is best to fly COS to DEN?
Before 9 AM: 86% of flights arrived on time, against 59% 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 COS to DEN?
SkyWest, with a season-adjusted 78% chance of operating and arriving on time over 3,259 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 COS to DEN?
June (72% on time); the best was November (85%), 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 COS

Live status: FAA delays and ground stops