Cheap flights from St. Louis to San Juan from $117

If you’re not able to fly to San Juan in October, then September is your next best option. Flight prices from St. Louis to San Juan during September average around $336.

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

You are more likely to see cheaper flights to San Juan from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $427 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from St. Louis for as low as $350 on momondo.

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

United Airlines and Delta are the most popular carriers operating from Lambert-St Louis to San Juan

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to San Juan from St. Louis according to our data. American Airlines is the first choice among our users, with 40% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 5 different airlines that fly to San Juan 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 93 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.