Route on-time record
COS to ORD: most on-time flights and the best time to fly
Colorado Springs (City of Colorado Springs Municipal Airport) to Chicago (Chicago O'Hare International Airport). 997 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was SkyWest 5830 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
COS → ORD
Colorado Springs to Chicago: 997 nonstop flights a year
On time (12 months)
75%
Cancelled
1.2%
avg delay 30 min
Best time to leave
Before 9 AM
88% on time vs 69% noon to 3 PM
Most reliable airline
United
78% chance on time
Lowest nonstop fare seen in the next two months: $257 (American 4942 on 2026-10-24). 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 · SkyWest 5830 · sold as United Express, Delta Connection, American Eagle or Alaska
6:00 AM → 9:50 AM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-20.
85%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.5%
- Avg arrival delay
- 13 min
- Arrived on time 87% of the time (185 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; Noon to 3 PM: 69%).
Moderate track record · 185 flights
Find 6:00 AM flight fares Opens this date on Aviasales#2 · SkyWest 5836 · sold as United Express, Delta Connection, American Eagle or Alaska
11:42 AM → 3:33 PM2h 41m nonstop
Local times, typical schedule. Last flown 2026-04-29.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 2.9%
- Avg arrival delay
- 22 min
- Arrived on time 79% of the time (67 flights, Jun 2025 to May 2026).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 61% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 67 flights
Find 11:42 AM flight fares Opens this date on Aviasales#3 · United 1398
12:16 PM → 4:02 PM2h 46m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.8%
- Avg arrival delay
- 17 min
- Arrived on time 79% of the time (124 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 88%).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 124 flights
Find United 1398 fares Opens this date on Aviasales#4 · United 1594
11:43 AM → 3:27 PM2h 44m nonstop
Local times, typical schedule. Last flown 2026-05-20.
77%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 59% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find United 1594 fares Opens this date on Aviasales#5 · SkyWest 4637 · sold as United Express, Delta Connection, American Eagle or Alaska
9:00 AM → 1:03 PM3h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 73% 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 9:00 AM flight fares Opens this date on Aviasales#6 · SkyWest 4955 · sold as United Express, Delta Connection, American Eagle or Alaska
12:10 PM → 4:05 PM2h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 88%).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find 12:10 PM flight fares Opens this date on Aviasales#7 · SkyWest 4994 · sold as United Express, Delta Connection, American Eagle or Alaska
12:22 PM → 4:09 PM2h 47m nonstop
Local times, typical schedule. Last flown 2026-05-20.
66%
chance on time
- On time (history)
- 67%
- Cancelled
- 2.3%
- Avg arrival delay
- 49 min
- Arrived on time 67% of the time (42 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 88%).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (42 flights), so its score leans on the airline's record at this hour.
Limited track record · 42 flights
Find 12:22 PM flight fares Opens this date on Aviasales#8 · SkyWest 6476 · sold as United Express, Delta Connection, American Eagle or Alaska
12:30 PM → 4:10 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-04-06.
60%
chance on time
- On time (history)
- 55%
- Cancelled
- 2.4%
- Avg arrival delay
- 94 min
- Arrived on time 55% of the time (82 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 88%).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 82 flights
Find 12:30 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines78%
180 flights · 81% on time as flown · 0.9% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)73%
817 flights · 74% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM88%
219 flights · avg delay 12 min
- 9 AM to noon79%
191 flights · avg delay 21 min
- Noon to 3 PM69%
587 flights · avg delay 40 min
Best day: Saturday (87%). Worst: Friday (77%).
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)51%
- Late-arriving aircraft27%
- Air traffic control and airport volume19%
- Severe weather4%
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 ORD questions
- What time of day is best to fly COS to ORD?
- Before 9 AM: 88% of flights arrived on time, against 69% 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 ORD?
- United, with a season-adjusted 78% chance of operating and arriving on time over 180 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 ORD?
- July (74% on time); the best was September (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 COS
- ORD to COS (return)
- COS to DEN 77%
- COS to DFW 78%
- COS to PHX 82%
- COS to LAS 80%
- COS to DAL 82%
- COS to SLC 93%
- COS to ATL 89%
Live status: FAA delays and ground stops