St. Louis (STL) to San Juan (SJU) flight deal from $318 USD in business class – flightdeals.net

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One Way•Business Class

Lambert-Saint Louis International Airport

St. Louis, United States

Luis Muñoz Marín International Airport

San Juan, Puerto Rico

$441 USD

-28%$318 USD

Verified Nov 30, 2025 at 3:26 AM

January 2026

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29$573 30$403 31$397 1$397 2$403 3$397 4$397 5$397 6$397 7$403 8$403 9$403 10$397 11$397 12$397 13$386 14$403 15$533 16$487 17$397 18$422 19$397 20$318 21$318 22$397 23$397 24$397 25$318 26$318 27$318 28$386 29$397 30$403 31$390 1

Limited Availability

10% of dates checked are available within 10% of the lowest price

Tuesday, January 20th, 2026

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