Cheap flights from St. Louis to San Juan from $99

If you aren’t able to travel to San Juan Luis Munoz Marin Intl Airport during the month of April, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $336.

Fly from Lambert-St Louis to San Juan Luis Munoz Marin Intl for the best Lambert-St Louis - San Juan Luis Munoz Marin Intl flight prices

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport for around $443 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan Luis Munoz Marin Intl Airport from St. Louis for as low as $379 on momondo.

There is only 1 cabin class available to choose from on St. Louis to San Juan Luis Munoz Marin Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to San Juan Luis Munoz Marin Intl Airport flight.

As of November 2026, prices for St. Louis to San Juan Luis Munoz Marin Intl Airport flights are approximately 57% more expensive when compared to flights at the same time last year.

Frontier and Southwest are the most popular carriers operating from Lambert-St Louis to San Juan Luis Munoz Marin Intl

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to San Juan Luis Munoz Marin Intl Airport from St. Louis according to our data. American Airlines is the first choice among our users, with 32% of people opting to fly with this airline when traveling to San Juan Luis Munoz Marin Intl Airport. Keep in mind that there are 6 different airlines that fly to San Juan Luis Munoz Marin Intl Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 30% of flights between St. Louis and San Juan have experienced a delay on any given week. The average delay length over the past 12 months has been 94 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Saturday has historically seen more delays on average compared to the rest of the week.

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 30% of their flights experiencing any sort of delay.

Orlando (MCO) was the most common stop: 52% of momondo users choosing 1-stop flights on this route connected there.

Flights via Dallas (DFW) offer the lowest average round-trip price of $256.

Flights connecting via Charlotte (CLT) have the shortest average one-way travel time: 6h 16m.

Charlotte (CLT) has the shortest average layover time for this route: 1h 10m.