STL to MSY flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to Louis Armstrong New Orleans International Airport · 604 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or MSY 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 New Orleans (MSY) arrived on time 84% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.1% were cancelled, and 5% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 10am did best (100% on time); around 9pm did worst (63%).
- Tuesday was the most reliable day to fly (92% on time) and Sunday the least (78%).
- The largest source of delay minutes was late-arriving aircraft (70%).
Which airline is most on time from STL to MSY?
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 84% | 0.1% | 10 min | 4.9% | 733 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am94%36 flights
- 8am91%235 flights
- 9am88%43 flights
- 10am100%22 flights
- 2pm85%26 flights
- 3pm70%53 flights
- 5pm100%28 flights
- 6pm92%24 flights
- 7pm94%49 flights
- 8pm77%56 flights
- 9pm63%127 flights
- 10pm73%22 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday84%0.0% cancelled
- Tuesday92%0.0% cancelled
- Wednesday86%0.0% cancelled
- Thursday80%0.0% cancelled
- Friday83%0.0% cancelled
- Saturday85%0.0% cancelled
- Sunday78%0.8% 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 aircraft70%
- Airline (crew, maintenance, cleaning, fueling)16%
- Air traffic control & airport congestion9%
- Extreme weather3%
- Security2%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Extreme weather0%
- Security0%
STL to MSY: common questions
- How often are STL to MSY flights on time?
- 84% 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 New Orleans cancelled?
- 0.1% of scheduled flights were cancelled (1 of 733).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 57 min behind schedule on average, and 4.9% of flights were an hour or more late.
- How long is taxi time at STL?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MSY to STL — 82% 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 → MSY, nonstop flights by US airlines that report to the DOT. How we calculate this.