Title: Cheap Flights from St. Louis (STL) to San Juan (SJU) - Expedia.ca ![Condado Beach which includes general coastal views and a coastal town](https://images.trvl-media.com/place/6082351/ae98bc8e-4169-4654-a33a-bab2e7b17b7e.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/6082351/ae98bc8e-4169-4654-a33a-bab2e7b17b7e.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from St. Louis (STL) to San Juan (SJU) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Lambert-St. Louis International Airport (STL) to Luis Munoz Marin Intl. Airport (SJU) - ![Frontier Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:sju,departure:22/10/2025TANYT&leg2=from:sju,to:stl,departure:29/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:sju,departure:22/10/2025TANYT&leg2=from:sju,to:stl,departure:29/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:sju,departure:22/10/2025TANYT&leg2=from:sju,to:stl,departure:29/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:sju,departure:22/10/2025TANYT&leg2=from:sju,to:stl,departure:29/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![Southwest Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:sju,departure:22/10/2025TANYT&leg2=from:sju,to:stl,departure:29/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Find the cheapest month to fly from St. Louis (STL) to San Juan (SJU) ### February is typically the cheapest month to fly From CA $213 - CA $679 per traveller. ## Frequently asked questions ### How much is a flight from STL to SJU? > Start packing your bags, because round-trip journeys between Lambert Field and Isla Verde Intl. Airport start from . That's based on airfares available within the last 7 days on Expedia for flights departing within the next year. Prices can increase quickly, so book now to get the best deal. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Lambert Field to SJU? > Every air carrier has its own terms and conditions. If you do decide to cancel, follow the easy instructions on our [Customer Service Portal](https://www.expedia.ca/helpcenter). ### How do I find cheap flights from Lambert-St. Louis Intl. Airport (STL) to Isla Verde Intl. Airport that have flexible change policies? > Flights from Lambert Field to Luis Munoz Marin Intl. Airport (SJU) with flexible change policies are available from several airlines. Simply use our "No change fees" filter during your search. You'll only need to cover the cost difference between the two flights, without any extra fees to worry about. ### How many hours is the flight from Lambert Field to SJU? > Consider bringing your own on-board entertainment, as it takes approximately 5 hours and 57 minutes to arrive at SJU from Lambert Field. A pair of noise-cancelling headphones will be useful too. ### How far is the flight from Lambert Field to SJU? > Around 3,300 kilometres separates St. Louis and Carolina, so pack something to help you fill in a few hours. That novel you haven't finished will be ideal. ### Which airlines fly direct from Lambert Field to Isla Verde Intl. Airport? > Check out Southwest Airlines (WN) if you want to travel straight from Lambert Field to Luis Munoz Marin Intl. Airport (SJU). This airline operates 4 flights every month, so you're sure to find one that fits your schedule. ### Are Lambert Field to Luis Munoz Marin Intl. Airport (SJU) flight tickets cheaper when they're purchased at the last minute? > Booking your trip from STL to SJU last minute could save you some cash. However, it could end up costing a great deal more! If you'd rather avoid the risk, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to a year in advance. If your preferred carrier hasn't released tickets yet, check back often as deals are updated all the time on Expedia. ## Travel information | Origin airport | Lambert-St. Louis Intl. | | --- | --- | | Destination airport | Luis Munoz Marin Intl. | | Distance | 3239 km | ## Book with confidence ### St. Louis to San Juan Flights **The easy way to book your flights from St. Louis to San Juan**  With Expedia, it’s simple to find and book flights to San Juan from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to Luis Munoz Marin Intl., too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to San Juan today, tomorrow, or this week.   **Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Luis Munoz Marin Intl., SJU**  Sort your search results by price to find great deals on your flight from St. Louis to San Juan—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to San Juan from St. Louis currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to San Juan   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to San Juan from St. Louis**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to San Juan with Expedia today. \*Available to Expedia members.