ORD to STL flight delays & on-time performance
Nonstop flights from Chicago O'Hare International Airport to St. Louis Lambert International Airport · 258 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ORD or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Chicago (ORD) to St. Louis (STL) arrived on time 72% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.9% were cancelled, and 11% arrived an hour or more late.
- Republic Airways was the most punctual airline here (76% on time); American Airlines was the least (66%).
- Departures scheduled around 7am did best (87% on time); around 5pm did worst (56%).
- Tuesday was the most reliable day to fly (78% on time) and Sunday the least (67%).
- The largest source of delay minutes was late-arriving aircraft (45%).
Which airline is most on time from ORD to STL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 76% | 3.0% | 20 min | 9.5% | 434 |
| Envoy AirRegional airline operating American Eagle flights. | 75% | 2.7% | 14 min | 7.1% | 782 |
| United Airlines | 73% | 1.4% | 21 min | 11.2% | 560 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 70% | 4.3% | 23 min | 13.2% | 809 |
| American Airlines | 66% | 2.8% | 32 min | 14.3% | 505 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am77%107 flights
- 7am87%242 flights
- 8am69%123 flights
- 9am81%32 flights
- 10am79%146 flights
- 11am72%151 flights
- 12pm77%349 flights
- 1pm82%187 flights
- 2pm72%418 flights
- 3pm78%156 flights
- 4pm74%204 flights
- 5pm56%125 flights
- 6pm65%200 flights
- 7pm61%300 flights
- 8pm56%67 flights
- 10pm62%205 flights
- 11pm61%59 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday71%6.6% cancelled
- Tuesday78%1.4% cancelled
- Wednesday73%1.2% cancelled
- Thursday75%2.4% cancelled
- Friday69%2.2% cancelled
- Saturday73%4.3% cancelled
- Sunday67%2.7% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft45%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion14%
- Extreme weather10%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather78%
- Air traffic control & airport congestion19%
- Airline (crew, maintenance, cleaning, fueling)3%
- Security0%
ORD to STL: common questions
- How often are ORD to STL flights on time?
- 72% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Chicago to St. Louis cancelled?
- 2.9% of scheduled flights were cancelled (91 of 3,090).
- How long are typical delays?
- Across all flights the average arrival delay was 21 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 11.0% of flights were an hour or more late.
- How long is taxi time at ORD?
- Flights on this route spent 27 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to ORD — 73% on time
More flights from Chicago
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ORD → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.