Route Reliability
Chicago → St. Louis
ORD–STL · 258 miles · Chicago O'Hare International Airport to St. Louis Lambert International Airport
- 69%
- Arrive within 15 minutes
- 21 min
- Average arrival delay
- 2.5%
- Cancelled
- 5,060
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines69%2,967 flights
- 2.American Airlines69%2,093 flights
What the data says
Morning-you made the right choice.
ORD–STL flights departing between 6–9 AM arrived on time 77% of the time, versus 61% between 9 PM–12 AM.
Friday is doing you no favors.
ORD–STL flights arrived on time 73% of the time on Tuesdays. On Fridays: 64%.
Not much between United Airlines and American Airlines.
On this route they all land within 69% to 69% on time. Pick on schedule and price.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon68%(707 flights)
- Tue73%(692 flights)
- Wed70%(713 flights)
- Thu72%(720 flights)
- Fri64%(714 flights)
- Sat71%(641 flights)
- Sun65%(732 flights)
- 6–9 AM77%(421 flights)
- 9 AM–12 PM74%(887 flights)
- 12–3 PM75%(1168 flights)
- 3–6 PM63%(869 flights)
- 6–9 PM64%(1046 flights)
- 9 PM–12 AM61%(528 flights)
Jun 68% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 68% | 413 |
| July 2025 | 61% | 416 |
| August 2025 | 73% | 391 |
| September 2025 | 83% | 384 |
| October 2025 | 75% | 410 |
| November 2025 | 71% | 371 |
| December 2025 | 59% | 364 |
| January 2026 | 62% | 344 |
| February 2026 | 74% | 384 |
| March 2026 | 62% | 428 |
| April 2026 | 66% | 482 |
| May 2026 | 74% | 532 |
Same trip, other airports
Keep nerding
Based on 5,060 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.