St. Louis (STL) to San Juan (SJU) cheap flight deal from $338 USD in business class – flightdeals.net

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Southwest Airlines

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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

$456 USD

-26%$338 USD

Verified Aug 12, 2025 at 8:37 PM

September 2025

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1$473 2$424 3$533 4$487 5$424 6$418 7$418 8$418 9$412 10$533 11$487 12$424 13$424 14$418 15$412 16$338 17$418 18$418 19$418 20$363 21$418 22$363 23$338 24$418 25$418 26$418 27$338 28$418 29$338 30$338 1 2 3 4 5

Limited Availability

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

Tuesday, September 16th, 2025

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