St Louis (STL) to San Juan (SJU) flights
Southwest Airlines flies nonstop from St. Louis Lambert International Airport to Luis Munoz Marin International Airport, with about <1 flights a week in July 2026. The 2,024-mile flight takes about 4h 21m gate to gate.
- Distance
- 2,024 mi · 3,257 km
- Flight time
- 4h 21m
- Airlines
- 1
- Seats filled
- 93%
Airlines flying STL to SJU
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | <1 | Boeing 737-800, Boeing 737 MAX 8 | 4,902 | 4h 21m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
Is STL to SJU on time?
From September 2025 to August 2026, 47% of 31 flights arrived within 15 minutes of schedule and 3.2% were cancelled. Most delay time was caused by air traffic control and airport congestion (46%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 31 | 47% | 20 min | 3.2% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 1 | 175 | |
| November 2025 | 4 | 615 | |
| December 2025 | 4 | 660 | |
| January 2026 | 4 | 649 | |
| February 2026 | 4 | 647 | |
| March 2026 | 4 | 650 | |
| April 2026 | 1 | 170 | |
| June 2026 | 4 | 670 | |
| July 2026 | 4 | 666 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.