STL to MIA flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to Miami International Airport · 1,068 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or MIA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from St. Louis (STL) to Miami (MIA) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.7% were cancelled, and 5% arrived an hour or more late.
- American Airlines was the most punctual airline here (90% on time); Southwest Airlines was the least (72%).
- Departures scheduled around 5am did best (94% on time); around 12pm did worst (70%).
- Wednesday was the most reliable day to fly (94% on time) and Saturday the least (69%).
- The largest source of delay minutes was late-arriving aircraft (42%).
Which airline is most on time from STL to MIA?
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 |
|---|---|---|---|---|---|
| American Airlines | 90% | 1.0% | 11 min | 4.5% | 606 |
| Envoy AirRegional airline operating American Eagle flights. | 83% | 0.0% | 9 min | 4.2% | 119 |
| Southwest Airlines | 72% | 0.5% | 14 min | 6.2% | 441 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 25% | 0.0% | 28 min | 0.0% | 4 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am94%369 flights
- 7am83%46 flights
- 8am79%81 flights
- 10am84%56 flights
- 11am87%169 flights
- 12pm70%115 flights
- 1pm70%75 flights
- 3pm33%12 flights
- 4pm76%45 flights
- 5pm63%24 flights
- 6pm77%150 flights
- 8pm47%18 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%1.9% cancelled
- Tuesday90%1.3% cancelled
- Wednesday94%0.0% cancelled
- Thursday87%0.0% cancelled
- Friday83%0.0% cancelled
- Saturday69%0.0% cancelled
- Sunday77%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 aircraft42%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion23%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Air traffic control & airport congestion38%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
STL to MIA: common questions
- How often are STL to MIA flights on time?
- 82% 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 St. Louis to Miami cancelled?
- 0.7% of scheduled flights were cancelled (8 of 1,170).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 59 min behind schedule on average, and 5.1% of flights were an hour or more late.
- How long is taxi time at STL?
- Flights on this route spent 13 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to STL — 74% on time
More flights from St. Louis
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STL → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.