Route
ORD → STL
Chicago O'Hare International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 71.2%
- Less than 15 minutes late
- Cancelled
- 2.9%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,113
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 48%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 14%
- Extreme weather 10%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 83.6% | 240 |
| October 2025 | 72.9% | 273 |
| November 2025 | 76.9% | 240 |
| December 2025 | 59.1% | 241 |
| January 2026 | 64.5% | 156 |
| February 2026 | 70.1% | 185 |
| March 2026 | 65.2% | 271 |
| April 2026 | 68.7% | 291 |
| May 2026 | 78.1% | 324 |
| June 2026 | 75.4% | 303 |
| July 2026 | 72.7% | 310 |
| August 2026 | 62.7% | 279 |
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 | 843 | 74.6% | 3.1% | 56 min |
| SkyWest Airlines | 782 | 68.9% | 4.2% | 74 min |
| United Airlines | 604 | 71.3% | 0.8% | 81 min |
| American Airlines | 472 | 65.4% | 3.0% | 102 min |
| Republic Airways | 412 | 75.2% | 3.2% | 84 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
AA1926
30% late · 152 flights
-
UA2618
29% late · 107 flights
-
UA2000
32% late · 103 flights
-
UA1355
9% late · 82 flights
-
UA2144
46% late · 80 flights
-
AA1004
45% late · 76 flights
-
MQ4144
41% late · 76 flights
-
OO6352
28% late · 76 flights
-
YX4537
19% late · 76 flights
-
MQ3764
21% late · 75 flights
-
MQ4104
5% late · 75 flights
-
OO5958
17% late · 72 flights
-
MQ3815
16% late · 70 flights
-
YX4595
33% late · 59 flights
-
MQ4282
19% late · 58 flights
-
MQ3573
43% late · 54 flights
-
UA485
39% late · 53 flights
-
YX3525
24% late · 50 flights
-
YX3495
26% late · 45 flights
-
AA2126
47% late · 44 flights
-
AA2956
23% late · 44 flights
-
AA418
27% late · 44 flights
-
OO6190
34% late · 44 flights
-
OO6399
33% late · 44 flights
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