St. Louis Lambert International Airport (STL) delays & on-time performance
St. Louis, Missouri · 65 nonstop destinations · 11 airlines · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
On-time arrivals
78%
arrived < 15 min late
Cancelled
1.3%
818 flights
Avg arrival delay
16 min
69 min when late
Departed on time
75%
avg taxi-out 13 min
Figures cover 63,318 departures from STL; on-time is measured at arrival. Arrivals into STL were on time 79% of the time.
Key facts
- Flights departing St. Louis Lambert International Airport (STL) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.3% were cancelled, and 7% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (88% on time); SkyWest Airlines was the least (70%).
- Departures scheduled around 5am did best (94% on time); around 9pm did worst (60%).
- The largest source of delay minutes was late-arriving aircraft (45%).
Most delayed routes from STL
Lowest on-time arrival rates among regularly flown routes.
- SFO · San Francisco60%761 flts
- BOS · Boston70%1,611 flts
- ORD · Chicago73%3,090 flts
- LAX · Los Angeles73%1,027 flts
- DCA · Washington73%2,416 flts
- FLL · Fort Lauderdale74%828 flts
- PHX · Phoenix75%2,315 flts
- LGA · New York75%2,624 flts
- DFW · Dallas/Fort Worth75%2,381 flts
- DEN · Denver76%3,676 flts
Most reliable routes from STL
Highest on-time arrival rates among regularly flown routes.
- SLC · Salt Lake City87%990 flts
- LIT · Little Rock85%403 flts
- ATL · Atlanta85%3,684 flts
- CLT · Charlotte84%1,835 flts
- MSY · New Orleans84%733 flts
- BNA · Nashville82%1,287 flts
- MKE · Milwaukee82%685 flts
- OKC · Oklahoma City82%412 flts
- CLE · Cleveland82%698 flts
- TUL · Tulsa82%403 flts
Best airline at STL
Departures from this airport, ranked by on-time arrival.
| Airline | On time | Cancelled | Avg delay | Routes | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 88% | 1.6% | 11 min | 4 | 5,325 |
| Alaska Airlines | 83% | 1.2% | 9 min | 2 | 861 |
| American Airlines | 81% | 2.1% | 23 min | 7 | 5,879 |
| Republic Airways | 79% | 4.5% | 18 min | 9 | 3,172 |
| Envoy Air | 78% | 2.5% | 19 min | 8 | 1,604 |
| Southwest Airlines | 77% | 0.6% | 14 min | 58 | 39,473 |
| United Airlines | 75% | 1.1% | 20 min | 5 | 2,356 |
| PSA Airlines | 75% | 5.1% | 29 min | 4 | 894 |
| Spirit Airlines | 73% | 1.3% | 30 min | 3 | 80 |
| Frontier Airlines | 72% | 2.1% | 29 min | 8 | 1,398 |
| SkyWest Airlines | 70% | 2.6% | 31 min | 11 | 2,276 |
Best time to fly out of STL
On-time arrival rate by scheduled departure hour (local time).
- 5am94%3,299 flts
- 6am89%4,621 flts
- 7am88%4,185 flts
- 8am88%5,511 flts
- 9am85%3,898 flts
- 10am87%4,934 flts
- 11am81%2,632 flts
- 12pm78%2,143 flts
- 1pm74%3,419 flts
- 2pm75%3,864 flts
- 3pm71%3,537 flts
- 4pm65%2,783 flts
- 5pm71%4,151 flts
- 6pm71%4,124 flts
- 7pm64%3,809 flts
- 8pm68%3,301 flts
- 9pm60%2,085 flts
- 10pm62%1,022 flts
Monthly trend
Why departures were late
- Late-arriving aircraft45%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion19%
- Extreme weather5%
- Security0%
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.