St. Louis (STL) to San Juan (SJU) flight deal from $635 USD in business class

AAAmerican Airlines

DLDelta Air Lines

UAUnited Airlines

WNSouthwest Airlines

Round Trip•Business Class

STL

Lambert-Saint Louis International Airport

St. Louis, United States

SJU

Luis Muñoz Marín International Airport

San Juan, Puerto Rico

$958 USD

-34%$635 USD

Verified Nov 30, 2025 at 3:25 AM

January 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29$969 30$877 31$793 1$793 2$877 3$793 4$793 5$749 6$793 7$793 8$793 9$877 10$793 11$793 12$793 13$703 14$877 15$929 16$957 17$793 18$743 19$743 20$635 21$635 22$793 23$793 24$793 25$635 26$635 27$635 28$703 29$793 30$877 31$707 1

Extremely Rare Availability

2% of dates checked are available within 10% of the lowest price

Tuesday, January 13th, 2026

10 round-trip options

Returning

Sun, Jan 18, 2026•5 Day Trip

$999 USD

Google Flights

Returning

Mon, Jan 19, 2026•6 Day Trip

$877 USD

Google Flights

Returning

Tue, Jan 20, 2026•7 Day Trip

$877 USD

Google Flights

Returning

Wed, Jan 21, 2026•8 Day Trip

$726 USD

Google Flights

Returning

Thu, Jan 22, 2026•9 Day Trip

$703 USD

Google Flights

Returning

Fri, Jan 23, 2026•10 Day Trip

$792 USD

Google Flights

Returning

Sat, Jan 24, 2026•11 Day Trip

$793 USD

Google Flights

Returning

Sun, Jan 25, 2026•12 Day Trip

$917 USD

Google Flights

Returning

Mon, Jan 26, 2026•13 Day Trip

$877 USD

Google Flights

Returning

Tue, Jan 27, 2026•14 Day Trip

$726 USD

Google Flights