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

UAUnited Airlines

Round Trip•Economy

SJU

Luis Muñoz Marín International Airport

San Juan, Puerto Rico

STL

Lambert-Saint Louis International Airport

St. Louis, United States

$522 USD

-57%$225 USD

Verified Dec 1, 2025 at 5:23 AM

April 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$519 31$407 1$323 2$412 3$553 4$773 5$658 6$629 7$417 8$248 9$310 10$407 11$467 12$619 13$504 14$386 15$339 16$339 17$407 18$407 19$525 20$504 21$361 22$225 23$339 24$359 25$407 26$525 27$603 28$407 29$293 30$225 1 2 3

Rare Availability

5% of dates checked are available within 10% of the lowest price

Thursday, April 2nd, 2026

10 round-trip options

Returning

Tue, Apr 7, 2026•5 Day Trip

$435 USD

Google Flights

Returning

Wed, Apr 8, 2026•6 Day Trip

$412 USD

Google Flights

Returning

Thu, Apr 9, 2026•7 Day Trip

$544 USD

Google Flights

Returning

Fri, Apr 10, 2026•8 Day Trip

$736 USD

Google Flights

Returning

Sat, Apr 11, 2026•9 Day Trip

$712 USD

Google Flights

Returning

Sun, Apr 12, 2026•10 Day Trip

$614 USD

Google Flights

Returning

Mon, Apr 13, 2026•11 Day Trip

$536 USD

Google Flights

Returning

Tue, Apr 14, 2026•12 Day Trip

$435 USD

Google Flights

Returning

Wed, Apr 15, 2026•13 Day Trip

$480 USD

Google Flights

Returning

Thu, Apr 16, 2026•14 Day Trip

$607 USD

Google Flights