SJU to STL flight delays & on-time performance
Nonstop flights from Luis Munoz Marin International Airport to St. Louis Lambert International Airport · 2,024 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SJU or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Juan (SJU) to St. Louis (STL) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 3.2% were cancelled, and 7% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- The largest source of delay minutes was late-arriving aircraft (68%).
Which airline is most on time from SJU 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 |
|---|---|---|---|---|---|
| Southwest Airlines | 77% | 3.2% | 13 min | 6.7% | 31 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 3pm73%11 flights
- 4pm67%10 flights
Best day of the week
On-time arrival rate by day of departure.
- Saturday77%3.2% 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 aircraft68%
- Airline (crew, maintenance, cleaning, fueling)18%
- Air traffic control & airport congestion14%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Extreme weather0%
- Security0%
SJU to STL: common questions
- How often are SJU to STL flights on time?
- 77% 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 San Juan to St. Louis cancelled?
- 3.2% of scheduled flights were cancelled (1 of 31).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 46 min behind schedule on average, and 6.7% of flights were an hour or more late.
- How long is taxi time at SJU?
- Flights on this route spent 21 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to SJU — 47% on time
More flights from San Juan
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SJU → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.