MIA to STL flight delays & on-time performance
Nonstop flights from Miami International Airport to St. Louis Lambert International Airport · 1,068 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MIA or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Miami (MIA) to St. Louis (STL) arrived on time 74% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.7% were cancelled, and 10% arrived an hour or more late.
- Envoy Air was the most punctual airline here (90% on time); Southwest Airlines was the least (69%).
- Departures scheduled around 7am did best (95% on time); around 7pm did worst (29%).
- Tuesday was the most reliable day to fly (82% on time) and Sunday the least (64%).
- The largest source of delay minutes was late-arriving aircraft (51%).
Which airline is most on time from MIA 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 |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 90% | 0.0% | 5 min | 2.5% | 119 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 75% | 0.0% | 55 min | 25.0% | 4 |
| American Airlines | 74% | 1.0% | 20 min | 10.7% | 604 |
| Southwest Airlines | 69% | 0.5% | 17 min | 10.5% | 440 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%27 flights
- 7am95%76 flights
- 8am91%164 flights
- 10am100%17 flights
- 12pm87%15 flights
- 1pm83%30 flights
- 2pm88%74 flights
- 3pm74%175 flights
- 4pm62%65 flights
- 5pm56%55 flights
- 6pm52%43 flights
- 7pm29%45 flights
- 8pm68%166 flights
- 9pm74%107 flights
- 10pm59%93 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday72%1.9% cancelled
- Tuesday82%0.6% cancelled
- Wednesday80%0.0% cancelled
- Thursday72%0.0% cancelled
- Friday75%0.0% cancelled
- Saturday74%0.5% cancelled
- Sunday64%1.6% 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 aircraft51%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion12%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Air traffic control & airport congestion38%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
MIA to STL: common questions
- How often are MIA to STL flights on time?
- 74% 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 Miami to St. Louis cancelled?
- 0.7% of scheduled flights were cancelled (8 of 1,167).
- How long are typical delays?
- Across all flights the average arrival delay was 18 min (early arrivals count as zero). Flights that were late arrived 64 min behind schedule on average, and 9.9% of flights were an hour or more late.
- How long is taxi time at MIA?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to MIA — 82% on time
More flights from Miami
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MIA → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.