Cheap flights from St. Louis to San Juan from $96
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Juan departing on 7/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to San Juan
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Frontier flights from St. Louis to San Juan
Our best Frontier deals on St. Louis to San Juan flight tickets
Southwest flights from St. Louis to San Juan
Our best Southwest deals on St. Louis to San Juan flight tickets
See travel insights to San Juan from
How to get the cheapest flight ticket from St. Louis to San Juan
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to San Juan?
If you’re not able to fly to San Juan in September, then August is your next best option. Flight prices from St. Louis to San Juan during August average around $351.
What is the cheapest day to depart on your flight to San Juan?
The cheapest day to depart from St. Louis to San Juan is on a Wednesday when prices can be found for as low as $404. The most expensive day to fly to San Juan is Saturday, with ticket prices averaging around $645.
What is the cheapest time of day to depart on your flight to San Juan?
The cheapest time of day to fly to San Juan is in the evening when flights can be purchased for as low as $310. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $660 on average. Flights to San Juan from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
What is the cheapest Lambert-St Louis to San Juan flight route?
Fly from Lambert-St Louis to San Juan Luis Munoz Marin Intl for the best Lambert-St Louis - San Juan flight prices
How far in advance should I book a flight to San Juan?
You are more likely to see cheaper flights to San Juan from St. Louis when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $441 when searching 4 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 $333 on momondo.
What cabin class options are available on Lambert-St Louis to San Juan flights?
There are 1 cabin classes available to choose from on Lambert-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.
What is the cheapest airline that flies from Lambert-St Louis to San Juan?
Spirit Airlines, Frontier, and United Airlines are the most popular carriers operating from Lambert-St Louis to San Juan
What airlines fly to San Juan?
American Airlines, Delta 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 46% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 6 different airlines that fly to San Juan on a routine basis, so you have a few additional options to choose from.
Cheap St. Louis to San Juan flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Juan
How far is Lambert-St Louis to San Juan by plane?
There are 2005.8 mi between Lambert-St Louis and San Juan. In terms of flight time, this usually takes a little over 6h 23m.
When did momondo last update prices for flights from Lambert-St Louis Airport to San Juan?
Prices for flights from Lambert-St Louis Airport to San Juan are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to San Juan?
The number of operators available for flights from Lambert-St Louis Airport to San Juan is 6 as of June 2025.
How old do you have to be to fly from Lambert-St Louis Airport to San Juan?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Juan.
What documentation or ID do you need to fly to San Juan?
The travel and health documents you'll need for your trip to San Juan may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Juan. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
Best airlines flying from St. Louis to San Juan
Compare and see reviews for airlines that fly from St. Louis to San Juan with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $140 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $155 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $219 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $244 | Free Cancellation | Rating 8.0 7,950 reviews | |||
| PriceFrom $254 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $351 | Free Cancellation | Rating 8.0 4,287 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to San Juan?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to San Juan. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from St. Louis to San Juan with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for St. Louis to San Juan flights to just show those with flexible booking policies.
How can momondo help me find flights from St. Louis to San Juan?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to San Juan.
I’m not ready to book a flight from St. Louis to San Juan right now. Can momondo alert me if prices change?
Yes. momondo can track prices for St. Louis to San Juan flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.