Route on-time record
COS to ATL: most on-time flights and the best time to fly
Colorado Springs (City of Colorado Springs Municipal Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 578 nonstop flights in Jun 2025 to May 2026, 89% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was Delta 1074 at 6:20 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
COS → ATL
Colorado Springs to Atlanta: 578 nonstop flights a year
On time (12 months)
89%
Cancelled
1.9%
avg delay 10 min
Best time to leave
Before 9 AM
94% on time vs 85% noon to 3 PM
Most reliable airline
Delta
87% 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 1074
6:20 AM → 11:18 AM2h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 89%
- Cancelled
- 1.2%
- Avg arrival delay
- 10 min
- Arrived on time 89% of the time (83 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; Noon to 3 PM: 85%).
Moderate track record · 83 flights
Find Delta 1074 fares Opens this date on Aviasales#2 · Delta 2427
1:28 PM → 6:25 PM2h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 85%
- Cancelled
- 2.9%
- Avg arrival delay
- 15 min
- Arrived on time 85% of the time (134 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 85% on time; Before 9 AM: 94%).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 134 flights
Find Delta 2427 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
578 flights · 89% on time as flown · 1.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
254 flights · avg delay 8 min
- Noon to 3 PM85%
324 flights · avg delay 12 min
Best day: Thursday (91%). Worst: Sunday (82%).
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)54%
- Late-arriving aircraft38%
- Air traffic control and airport volume4%
- 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
COS to ATL questions
- What time of day is best to fly COS to ATL?
- Before 9 AM: 94% of flights arrived on time, against 85% for departures noon to 3 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 ATL?
- Delta, with a season-adjusted 87% 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 COS to ATL?
- January (78% on time); the best was September (94%), 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
- ATL to COS (return)
- COS to DEN 77%
- COS to DFW 78%
- COS to ORD 75%
- COS to PHX 82%
- COS to LAS 80%
- COS to DAL 82%
- COS to SLC 93%
Live status: FAA delays and ground stops