Deal found on October 21, 2026
St. Louis to San Juan
$263$43640% off
Round trip
Round trip to San Juan from STL typically runs about $438, and Frontier has it priced at $263 right now, a 40% discount. Puerto Rico needs no passport for US travelers and pairs some of the best old-town-to-beach access in the Caribbean. One connection keeps the savings intact without a rough routing.
Travel dates
Dates in December
e.g. Dec 2 – Dec 11 · 9 nights
Date options
3 at this price
Lowest we've seen
$171
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