St. Louis (STL) to San Juan (SJU) flight deal from $225 USD in economy class

AAAmerican Airlines

Round Trip•Economy

STL

Lambert-Saint Louis International Airport

St. Louis, United States

SJU

Luis Muñoz Marín International Airport

San Juan, Puerto Rico

$398 USD

-43%$225 USD

Verified Nov 28, 2025 at 9:05 AM

December 2025

Today

Mon

Tue

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Sun

1$585 2$585 3$585 4$585 5$400 6$400 7$400 8$400 9$400 10$400 11$400 12$355 13$355 14$355 15$355 16$355 17$400 18$770 19$770 20$818 21$548 22$600 23$563 24$638 25$918 26$794 27$768 28$688 29$273 30$273 31$225 1$225 2$232 3$225 4$225

Fair Availability

31% of dates checked are available within 10% of the lowest price

Sunday, December 21st, 2025

10 round-trip options

Returning

Fri, Dec 26, 2025•5 Day Trip

$548 USD

Google Flights

Returning

Sat, Dec 27, 2025•6 Day Trip

$600 USD

Google Flights

Returning

Sun, Dec 28, 2025•7 Day Trip

$775 USD

Google Flights

Returning

Mon, Dec 29, 2025•8 Day Trip

$648 USD

Google Flights

Returning

Tue, Dec 30, 2025•9 Day Trip

$723 USD

Google Flights

Returning

Wed, Dec 31, 2025•10 Day Trip

$623 USD

Google Flights

Returning

Thu, Jan 1, 2026•11 Day Trip

$870 USD

Google Flights

Returning

Fri, Jan 2, 2026•12 Day Trip

$1,236 USD

Google Flights

Returning

Sat, Jan 3, 2026•13 Day Trip

$1,464 USD

Google Flights

Returning

Sun, Jan 4, 2026•14 Day Trip

$1,236 USD

Google Flights