State · IL · 2020–2025 BTS data
Illinois
According to PlainFlights' state traffic ranking (BTS On-Time Performance total flights), Illinois ranks #4 of 53 US states by total flight operations (most flights = #1).
Data updated 2026-06-13
- 80.5%
- On-time
- +1.5 pts
- vs US avg
- 77 min
- Delay when late
- 1.24%
- Cancelled
- #4 of 53
- Corpus placement
State reliability verdict
According to U.S. DOT BTS data, Illinois is a busy-book state: 4,168,274 operations at 10 airports run 80.5% on-time, 1.5 pts above the 79% U.S. average. Among tracked airports, BMI leads locally at 85.2% on-time.
- 80.5%
- statewide on-time
- +1.5 pts
- vs US average
- 10
- airports tracked
- 1.24%
- cancellation rate
On-time means arrived less than 15 minutes after schedule. Figures are historical BTS averages, not a guarantee for any single flight.
Illinois vs all states by total flight operations
Where this state's BTS On-Time Performance flight count sits among every state with tracked operations (traffic density, not on-time quality)
4,168,274 Top 8% more flights than 92% of 53 states
States, banded by total BTS-tracked flights
Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source BTS On-Time Performance · 2026-06-13
Airports in Illinois
Illinois airports ranked by on-time rate
10 BTS-tracked airports, led by BMI at 85.2%
On-time rate by airport
- BMI
Bloomington/Normal, IL: 85.2% on-time, 25,097 flights
85 %
- CMI
Champaign/Urbana, IL: 84.8% on-time, 17,865 flights
85 %
- DEC
Decatur, IL: 84.5% on-time, 9,084 flights
85 %
- MLI
Moline, IL: 83.4% on-time, 45,407 flights
83 %
- SPI
Springfield, IL: 82.8% on-time, 8,116 flights
83 %
- ORD
Chicago, IL: 81% on-time, 3,114,086 flights
81 %
- PIA
Peoria, IL: 80.7% on-time, 44,104 flights
81 %
- RFD
Rockford, IL: 78.9% on-time, 9,512 flights
79 %
- MDW
Chicago, IL: 78.4% on-time, 880,912 flights
78 %
- BLV
Belleville, IL: 76.4% on-time, 14,072 flights
76 %
What this shows Airports here range from 76.4% to 85.2% on-time.
| Code | Airport | City | Flights | On-Time | Avg Delay (when late) |
|---|---|---|---|---|---|
| ORD | Chicago, IL | Chicago | 3,114,086 | 81% | 81.9 min |
| MDW | Chicago, IL | Chicago | 880,912 | 78.4% | 59.1 min |
| MLI | Moline, IL | Moline | 45,407 | 83.4% | 88.4 min |
| PIA | Peoria, IL | Peoria | 44,104 | 80.7% | 86.3 min |
| BMI | Bloomington/Normal, IL | Bloomington/Normal | 25,097 | 85.2% | 88.2 min |
| CMI | Champaign/Urbana, IL | Champaign/Urbana | 17,865 | 84.8% | 79.9 min |
| BLV | Belleville, IL | Belleville | 14,072 | 76.4% | 84.7 min |
| RFD | Rockford, IL | Rockford | 9,512 | 78.9% | 84.9 min |
| DEC | Decatur, IL | Decatur | 9,084 | 84.5% | 127.5 min |
| SPI | Springfield, IL | Springfield | 8,116 | 82.8% | 85.4 min |
Illinois traffic-scale reading
The standout signal in Illinois is traffic scale: 4,168,274 BTS flights place it #4 of 53 by book size. That busy-book footprint sits beside a 80.5% on-time rate (1.5 pts above the 79% U.S. average), 812,774 delayed departures, and a 1.24% cancellation rate.
As a busy-book state, Chicago, IL (ORD) in Chicago dominates the average with 3,114,086 flights at 81% on-time - hub delay mix swings the state figure more than a thin schedule would.
On the recent 24-month tape, delay pressure is lightest in Feb 2024 and heaviest in Jul 2025. On reliability, Bloomington/Normal, IL (BMI) posts the highest on-time rate at 85.2% across 25,097 flights. On-time performance explained.
States With a Similar On-Time Rate
Other U.S. states whose statewide on-time rate is closest to Illinois's 80.5%.
Using Illinois's data
Illinois's statewide on-time book sits in the slower third of BTS states; check the specific airport before treating the headline as typical.
- Bloomington/Normal, IL (BMI) is the most reliable airport in Illinois among those with meaningful traffic. BMI profile
- Chicago, IL handles the most traffic in the state; its performance weighs heavily on the state average. ORD profile
- See how Illinois compares with every other state that has BTS-tracked airports. All states
State averages are flight-weighted across all reporting airports in the state; a single busy airport can dominate the figure.
Read our methodology - how this data is sourced, computed, and verified.
Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025