Cheap Flights from St Louis to San Juan

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The latest fare from St Louis to San Juan: $286 round trip, Dec 3 – Dec 9, seen Nov 9. Prices by month are below.

Across 3 months of observations from St Louis to San Juan, the lowest round-trip economy fare we recorded was $190, in November. The typical economy fare was $395. November was the cheapest month we saw and October the dearest.

The most recent economy price we saw on this route was $286 on Frontier, seen Nov 9.

See every deal from St Louis, to San Juan, or the return direction San Juan to St Louis.

Latest economy price we saw: St Louis to San Juan

The most recent economy round-trip fare we saw on this route.

From	Price	Per mile	Travel dates	Airline	Seen
St Louis (STL) to San Juan (SJU)	$286	7.1¢	Dec 3 – Dec 9	Frontier	Nov 9

Economy price history: St Louis to San Juan

The lowest fares we saw each month.

Month	Low	Typical	Sightings
Nov 2026	$190	$218	48
Oct 2026	$590	$638	44
Sep 2026	$329	$329	6

Frequently asked questions

How many flight deals from St Louis to San Juan are on Sparkflights right now?

There are 0 deals from St Louis to San Juan on the board right now.

What is the lowest price ever seen from St Louis to San Juan?

The lowest economy fare we've recorded from St Louis to San Juan is $190, based on 98 price observations over 3 months.

How much does a flight from St Louis to San Juan cost?

The typical round-trip economy fare we observed from St Louis to San Juan is $395, against a recorded low of $190. These are observations, not quotes.

When is the cheapest month to fly St Louis to San Juan?

For economy fares from St Louis to San Juan, November was the cheapest month we observed and October the dearest, over 3 months of data.

What is the current price from St Louis to San Juan?

The most recent economy fare we saw from St Louis to San Juan is $286, on Nov 9.