St. Louis Lambert International ⇄ Luis Munoz Marin International STL–SJU
Airlines flew 63 flights between St. Louis Lambert International STL in St Louis, MO and Luis Munoz Marin International SJU in San Juan, PR in the twelve months to July 2026, both directions together: 9,901 passengers in 11,101 seats, 89% of them filled, and 23,778 pounds of freight. 2,024 miles, about 241 minutes in the air, on 4 airlines: Southwest Airlines Co. (60), American Airlines Inc. (1), Spirit Air Lines (1), United Air Lines Inc. (1). Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 9 |
| 2/25 | 8 |
| 3/25 | 10 |
| 4/25 | 9 |
| 5/25 | 10 |
| 6/25 | 8 |
| 7/25 | 9 |
| 8/25 | 2 |
| 11/25 | 8 |
| 12/25 | 8 |
| 1/26 | 8 |
| 2/26 | 8 |
| 3/26 | 10 |
| 4/26 | 3 |
| 6/26 | 8 |
| 7/26 | 8 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 1,097 |
| 2/25 | 1,150 |
| 3/25 | 1,372 |
| 4/25 | 1,020 |
| 5/25 | 1,328 |
| 6/25 | 1,342 |
| 7/25 | 1,426 |
| 8/25 | 342 |
| 11/25 | 1,203 |
| 12/25 | 1,104 |
| 1/26 | 1,277 |
| 2/26 | 1,263 |
| 3/26 | 1,559 |
| 4/26 | 507 |
| 6/26 | 1,308 |
| 7/26 | 1,338 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Southwest Airlines Co. WN | 60 | 9,455 | 90% | scheduled passenger service |
| American Airlines Inc. AA | 1 | 112 | 65% | scheduled passenger service |
| Spirit Air Lines NK | 1 | 149 | 65% | scheduled passenger service |
| United Air Lines Inc. UA | 1 | 185 | 92% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing B737 Max 800 | 31 | 175 | 4,837 |
| Boeing 737-800 | 30 | 175 | 4,730 |
| Airbus Industrie A321-200n | 2 | 214 | 334 |
STL → SJU this direction alone · flown January 2025 to July 2026
30 flights of 31 scheduled, 4,902 passengers in 5,250 seats, 23,082 pounds of freight. Southwest Airlines Co. 30.
SJU → STL this direction alone · flown January 2025 to July 2026
33 flights of 33 scheduled, 4,999 passengers in 5,851 seats, 696 pounds of freight. Southwest Airlines Co. 30; American Airlines Inc. 1; Spirit Air Lines 1; United Air Lines Inc. 1.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: St. Louis Lambert International STL and Luis Munoz Marin International SJU; all routes.