Route Price Intelligence
Cheap Flights From St. Louis to San Juan
Live pricing benchmarks, monthly patterns, and historical lows for this route.
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.
✓ 3 date combinations found at this price
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Best Time to Fly from St. Louis to San Juan
The cheapest time to fly from St. Louis to San Juan is typically November, when fares average around $362. The most expensive month tends to be July at around $516. For the best deals, consider flying in November, October, January.
Typical Price by Travel Month
Median round-trip fare for each month, with the typical price range, from our ongoing tracking of this route