Route Reliability
St. Louis → Chicago
STL–ORD · 258 miles · St. Louis Lambert International Airport to Chicago O'Hare International Airport
- 72%
- Arrive within 15 minutes
- 21 min
- Average arrival delay
- 2.6%
- Cancelled
- 5,057
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.American Airlines73%2,094 flights
- 2.United Airlines70%2,963 flights
What the data says
Morning-you made the right choice.
STL–ORD flights departing between 3–6 AM arrived on time 90% of the time, versus 57% between 6–9 PM.
Thursday has been the better bet.
A small edge: 74% on time on Thursdays against 68% on Sundays.
Not much between American Airlines and United Airlines.
On this route they all land within 70% to 73% 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
- Mon69%(705 flights)
- Tue74%(686 flights)
- Wed73%(706 flights)
- Thu74%(721 flights)
- Fri71%(710 flights)
- Sat74%(645 flights)
- Sun68%(745 flights)
- 3–6 AM90%(173 flights)
- 6–9 AM80%(1520 flights)
- 9 AM–12 PM70%(980 flights)
- 12–3 PM69%(739 flights)
- 3–6 PM66%(999 flights)
- 6–9 PM57%(505 flights)
- 9 PM–12 AM—(2 flights)
Jun 77% → May 76% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 412 |
| July 2025 | 66% | 414 |
| August 2025 | 73% | 392 |
| September 2025 | 80% | 383 |
| October 2025 | 72% | 410 |
| November 2025 | 70% | 374 |
| December 2025 | 65% | 369 |
| January 2026 | 65% | 342 |
| February 2026 | 80% | 383 |
| March 2026 | 68% | 429 |
| April 2026 | 68% | 480 |
| May 2026 | 76% | 530 |
Same trip, other airports
Keep nerding
Based on 5,057 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.