Route on-time record
DEC to ORD: most on-time flights and the best time to fly
Decatur (Decatur Airport) to Chicago (Chicago O'Hare International Airport). 627 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 4.8% were cancelled. The most reliable flight number was SkyWest 5027 at 9:52 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DEC → ORD
Decatur to Chicago: 627 nonstop flights a year
On time (12 months)
68%
Cancelled
4.8%
avg delay 35 min
Best time to leave
9 AM to noon
82% on time vs 55% 6 to 9 PM
Most reliable airline
SkyWest
65% 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 · SkyWest 5027 · sold as United Express, Delta Connection, American Eagle or Alaska
9:52 AM → 11:05 AM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 81%
- Cancelled
- 2.4%
- Avg arrival delay
- 21 min
- Arrived on time 81% of the time (206 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 82% on time; 6 to 9 PM: 55%).
Strong track record · 206 flights
Find 9:52 AM flight fares Opens this date on Aviasales#2 · SkyWest 5111 · sold as United Express, Delta Connection, American Eagle or Alaska
9:42 AM → 10:55 AM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-20.
72%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 40 min
- Arrived on time 67% of the time (15 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 82% on time; 6 to 9 PM: 55%).
Limited track record · 15 flights
Find 9:42 AM flight fares Opens this date on Aviasales#3 · SkyWest 5032 · sold as United Express, Delta Connection, American Eagle or Alaska
7:25 PM → 8:38 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-20.
60%
chance on time
- On time (history)
- 65%
- Cancelled
- 4.8%
- Avg arrival delay
- 77 min
- Arrived on time 65% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 55% on time; 9 AM to noon: 82%).
Limited track record · 20 flights
Find 7:25 PM flight fares Opens this date on Aviasales#4 · SkyWest 6077 · sold as United Express, Delta Connection, American Eagle or Alaska
7:05 PM → 8:13 PM1h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
55%
chance on time
- On time (history)
- 45%
- Cancelled
- 0.0%
- Avg arrival delay
- 100 min
- Arrived on time 45% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 55% on time; 9 AM to noon: 82%).
- 94% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 11 flights
Find 7:05 PM 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)65%
627 flights · 68% on time as flown · 4.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon82%
300 flights · avg delay 21 min
- 6 to 9 PM55%
327 flights · avg delay 49 min
Best day: Monday (80%). Worst: Sunday (71%).
Smarter routing
Nearby airports that run more on time
BMI → ORD 80% chance on time
Central Illinois Regional Airport at Bloomington-Normal to Chicago O'Hare International Airport · 880 flights a year · 44 mi from your airports · yours: 65%
SPI → ORD 77% chance on time
Abraham Lincoln Capital Airport to Chicago O'Hare International Airport · 682 flights a year · 43 mi from your airports · yours: 65%
CMI → ORD 72% chance on time
University of Illinois Willard Airport to Chicago O'Hare International Airport · 1,024 flights a year · 34 mi from your airports · yours: 65%
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)40%
- Late-arriving aircraft39%
- Air traffic control and airport volume13%
- 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
DEC to ORD questions
- What time of day is best to fly DEC to ORD?
- 9 AM to noon: 82% of flights arrived on time, against 55% for departures 6 to 9 PM.
- Which airline is most on time from DEC to ORD?
- SkyWest, with a season-adjusted 65% chance of operating and arriving on time over 627 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 DEC to ORD?
- May (70% on time); the best was October (79%), 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 DEC
Live status: FAA delays and ground stops