Route
STL → ORD
St. Louis Lambert International Airport Chicago O'Hare International Airport
How punctual is this route?
- On-time arrivals
- 72.5%
- Less than 15 minutes late
- Cancelled
- 3.5%
- Of scheduled flights
- Average delay when late
- 105 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,112
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 36%
- Late-arriving aircraft 31%
- Airline (crew, maintenance, cleaning) 22%
- Extreme weather 11%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 81.0% | 239 |
| October 2025 | 70.4% | 274 |
| November 2025 | 68.1% | 241 |
| December 2025 | 62.7% | 240 |
| January 2026 | 71.1% | 156 |
| February 2026 | 83.7% | 185 |
| March 2026 | 65.5% | 271 |
| April 2026 | 71.8% | 294 |
| May 2026 | 80.4% | 322 |
| June 2026 | 70.3% | 304 |
| July 2026 | 77.1% | 309 |
| August 2026 | 68.3% | 277 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Envoy Air | 844 | 75.2% | 3.3% | 98 min |
| SkyWest Airlines | 783 | 64.2% | 5.0% | 113 min |
| United Airlines | 600 | 70.9% | 1.7% | 97 min |
| American Airlines | 470 | 82.0% | 2.8% | 145 min |
| Republic Airways | 415 | 74.2% | 4.6% | 81 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
AA1926
21% late · 121 flights
-
AA2444
16% late · 103 flights
-
UA1382
28% late · 82 flights
-
UA1639
36% late · 82 flights
-
MQ4144
39% late · 76 flights
-
OO6352
36% late · 76 flights
-
YX4537
21% late · 76 flights
-
MQ4104
5% late · 75 flights
-
OO5572
24% late · 72 flights
-
MQ3815
28% late · 70 flights
-
OO6332
48% late · 66 flights
-
AA1997
11% late · 61 flights
-
MQ4282
25% late · 56 flights
-
UA1156
31% late · 55 flights
-
UA473
24% late · 52 flights
-
YX3528
12% late · 51 flights
-
YX3597
39% late · 49 flights
-
MQ3461
29% late · 48 flights
-
UA2805
11% late · 47 flights
-
AA418
30% late · 44 flights
-
OO6190
30% late · 44 flights
-
OO6399
22% late · 44 flights
-
AA3128
5% late · 43 flights
-
MQ4135
16% late · 43 flights
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