Route Price Intelligence
Cheap Flights From St. Louis to San Juan
Live pricing benchmarks, monthly patterns, and historical lows for this route.
Price dropped again: We sent this San Juan fare on Oct 21 at $263, it's now down to $257. That's well under the usual $360-436 range, with 4 different date options across November and December on Frontier. San Juan pairs a lively old town with beach time just minutes away, worth booking while fares stay this low.
✓ 4 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 March at around $438. For the best deals, consider flying in November, January, February.
Typical Price by Travel Month
Median round-trip fare for each month, with the typical price range, from our ongoing tracking of this route