Route on-time record
ATL to COS: most on-time flights and the best time to fly
Atlanta (Hartsfield Jackson Atlanta International Airport) to Colorado Springs (City of Colorado Springs Municipal Airport). 578 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was Delta 2427 at 11:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ATL → COS
Atlanta to Colorado Springs: 578 nonstop flights a year
On time (12 months)
78%
Cancelled
1.7%
avg delay 14 min
Best time to leave
9 AM to noon
84% on time vs 71% 6 to 9 PM
Most reliable airline
Delta
77% chance on time
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 · Delta 2427
11:15 AM → 12:33 PM3h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 82%
- Cancelled
- 2.9%
- Avg arrival delay
- 11 min
- Arrived on time 82% of the time (136 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 84% on time; 6 to 9 PM: 71%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 136 flights
Find Delta 2427 fares Opens this date on Aviasales#2 · Delta 971
7:09 PM → 8:28 PM3h 11m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 75%
- Cancelled
- 1.2%
- Avg arrival delay
- 14 min
- Arrived on time 75% of the time (84 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 71% on time; 9 AM to noon: 84%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 84 flights
Find Delta 971 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines77%
578 flights · 78% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon84%
270 flights · avg delay 10 min
- Noon to 3 PM81%
54 flights · avg delay 13 min
- 6 to 9 PM71%
247 flights · avg delay 18 min
Best day: Wednesday (81%). Worst: Sunday (70%).
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
- Airline (crew, maintenance, boarding)50%
- Late-arriving aircraft19%
- Air traffic control and airport volume16%
- Severe weather14%
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
ATL to COS questions
- What time of day is best to fly ATL to COS?
- 9 AM to noon: 84% of flights arrived on time, against 71% for departures 6 to 9 PM.
- Which airline is most on time from ATL to COS?
- Delta, with a season-adjusted 77% chance of operating and arriving on time over 578 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 ATL to COS?
- July (64% on time); the best was December (88%), 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 ATL
- COS to ATL (return)
- ATL to LGA 73%
- ATL to MCO 69%
- ATL to FLL 69%
- ATL to DCA 69%
- ATL to DFW 73%
- ATL to ORD 71%
- ATL to EWR 72%
- ATL to MIA 70%
- ATL to TPA 71%
- ATL to PHL 73%
- ATL to DEN 76%
- ATL to BWI 74%
Live status: FAA delays and ground stops