Route on-time record

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

Denver (Denver International Airport) to Colorado Springs (City of Colorado Springs Municipal Airport). 5,059 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was Southwest 1384 at 8:35 AM.

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

DEN → COS

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

On time (12 months)

75%

Cancelled

1.5%

avg delay 19 min

Best time to leave

Before 9 AM

86% on time vs 64% 6 to 9 PM

Most reliable airline

United

75% chance on time

Check DEN to COS 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 · Southwest 1384
8:35 AM → 9:20 AM45m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2492; its record covers all of them.
88%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 94% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 64%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 64 flights
Find Southwest 1384 fares Opens this date on Aviasales
#2 · Southwest 1281
9:00 AM → 9:45 AM45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
97%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 97% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 1281 fares Opens this date on Aviasales
#3 · SkyWest 5246 · sold as United Express, Delta Connection, American Eagle or Alaska
7:50 AM → 8:49 AM57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
85%
Cancelled
0.3%
Avg arrival delay
8 min
- Arrived on time 85% of the time (350 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 64%).
- 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 · 350 flights
Find 7:50 AM flight fares Opens this date on Aviasales
#4 · SkyWest 4745 · sold as United Express, Delta Connection, American Eagle or Alaska
10:50 PM → 11:56 PM1h 06m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
84%
Cancelled
0.5%
Avg arrival delay
13 min
- Arrived on time 84% of the time (203 flights, Jun 2025 to May 2026).
- 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 · 203 flights
Find 10:50 PM flight fares Opens this date on Aviasales
#5 · United 2482
1:30 PM → 2:20 PM51m nonstop
Local times, typical schedule. Last flown 2026-05-20.
80%
chance on time
On time (history)
85%
Cancelled
3.3%
Avg arrival delay
9 min
- Arrived on time 85% of the time (59 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (2 of 61).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (59 flights), so its score leans on the airline's record at this hour.
Limited track record · 59 flights
Find United 2482 fares Opens this date on Aviasales
#6 · SkyWest 5855 · sold as United Express, Delta Connection, American Eagle or Alaska
1:39 PM → 2:36 PM57m nonstop
Local times, typical schedule. Last flown 2026-04-29.
80%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
14 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- 100% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find 1:39 PM flight fares Opens this date on Aviasales
#7 · SkyWest 5306 · sold as United Express, Delta Connection, American Eagle or Alaska
10:05 AM → 11:05 AM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
82%
Cancelled
2.6%
Avg arrival delay
13 min
- Arrived on time 82% of the time (295 flights, Jun 2025 to May 2026).
- 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 · 295 flights
Find 10:05 AM flight fares Opens this date on Aviasales
#8 · SkyWest 4734 · sold as United Express, Delta Connection, American Eagle or Alaska
11:21 AM → 12:21 PM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
80%
Cancelled
3.5%
Avg arrival delay
15 min
- Arrived on time 80% of the time (222 flights, Jun 2025 to May 2026).
- Cancelled 3.5% of the time (8 of 230).
- 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 · 222 flights
Find 11:21 AM flight fares Opens this date on Aviasales
#9 · SkyWest 5614 · sold as United Express, Delta Connection, American Eagle or Alaska
12:18 PM → 1:14 PM56m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
83%
Cancelled
1.5%
Avg arrival delay
9 min
- Arrived on time 83% of the time (65 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 65 flights
Find 12:18 PM flight fares Opens this date on Aviasales
#10 · Southwest 3630
3:55 PM → 4:40 PM45m nonstop
Local times, typical schedule. Last flown 2026-04-01.
78%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- 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 (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3630 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines75%
645 flights · 76% on time as flown · 1.0% cancel
SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)74%
3,259 flights · 76% on time as flown · 2.0% cancel
Southwest Airlines72%
1,155 flights · 73% on time as flown · 0.6% cancel

On time by departure time

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

Before 9 AM86%
432 flights · avg delay 7 min
9 AM to noon83%
1,010 flights · avg delay 12 min
Noon to 3 PM82%
700 flights · avg delay 11 min
3 to 6 PM71%
1,160 flights · avg delay 21 min
6 to 9 PM64%
957 flights · avg delay 31 min
After 9 PM71%
800 flights · avg delay 22 min

Best day: Tuesday (80%). Worst: Friday (73%).

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.

What delays this route

Late-arriving aircraft41%
Airline (crew, maintenance, boarding)33%
Air traffic control and airport volume18%
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

DEN to COS questions

What time of day is best to fly DEN to COS?: Before 9 AM: 86% of flights arrived on time, against 64% 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 DEN to COS?: United, with a season-adjusted 75% chance of operating and arriving on time over 645 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 COS?: June (67% on time); the best was October (84%), 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

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