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$70 Cheap Flights from San Juan (SJU) to St. Louis (STL)

View $70 flight on Wed, Oct 7, 2026Opens in a new window

Popular airlines from Luis Munoz Marin Intl. Airport (SJU) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from San Juan to St. Louis (SJU-STL)

Prices were available within the past 7 days and start at $70 for one-way flights and $206 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Oct 7 - Sat, Oct 10
SJU
San Juan
STL
St. Louis
$206 Roundtrip, found 3 days ago
$206
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Sat, Oct 10, priced at $206 found 3 days ago
Frontier Airlines
Wed, Oct 7 - Sat, Oct 10
SJU
San Juan
STL
St. Louis
$223 Roundtrip, found 3 days ago
$223
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Sat, Oct 10, priced at $223 found 3 days ago
Frontier Airlines
Wed, Oct 7 - Mon, Oct 19
SJU
San Juan
STL
St. Louis
$225 Roundtrip, found 1 day ago
$225
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Mon, Oct 19, priced at $225 found 1 day ago
Frontier Airlines
Wed, Oct 7 - Fri, Oct 9
SJU
San Juan
STL
St. Louis
$229 Roundtrip, found 3 hours ago
$229
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Fri, Oct 9, priced at $229 found 3 hours ago
Frontier Airlines
Wed, Oct 7 - Mon, Oct 19
SJU
San Juan
STL
St. Louis
$244 Roundtrip, found 1 day ago
$244
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Mon, Oct 19, priced at $244 found 1 day ago
Frontier Airlines
Wed, Oct 7 - Sat, Oct 10
SJU
San Juan
STL
St. Louis
$246 Roundtrip, found 3 days ago
$246
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Oct 7 from San Juan to St. Louis, returning Sat, Oct 10, priced at $246 found 3 days ago
American Airlines
Thu, Oct 29 - Mon, Nov 2
SJU
San Juan
STL
St. Louis
$396 Roundtrip, found 13 hours ago
$396
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Thu, Oct 29 from San Juan to St. Louis, returning Mon, Nov 2, priced at $396 found 13 hours ago
Delta
Wed, Nov 11 - Wed, Nov 18
SJU
San Juan
STL
St. Louis
$396 Roundtrip, just found
$396
Roundtrip
just found
Select Delta flight, departing Wed, Nov 11 from San Juan to St. Louis, returning Wed, Nov 18, priced at $396 just found
United
Wed, Nov 4 - Wed, Nov 11
SJU
San Juan
STL
St. Louis
$396 Roundtrip, just found
$396
Roundtrip
just found
Select United flight, departing Wed, Nov 4 from San Juan to St. Louis, returning Wed, Nov 11, priced at $396 just found
Southwest Airlines
Fri, Nov 6 - Fri, Nov 13
SJU
San Juan
STL
St. Louis
$396 Roundtrip, just found
$396
Roundtrip
just found
Select Southwest Airlines flight, departing Fri, Nov 6 from San Juan to St. Louis, returning Fri, Nov 13, priced at $396 just found

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $442
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $442

What you need to know for your flight from Luis Munoz Marin Intl. to Lambert-St. Louis Intl.

San Juan (SJU) to St. Louis (STL) at a glance

Travel to St. Louis (STL) from San Juan (SJU) with a range of airlines on this international short-haul route. Explore various options from full-service and low-cost carriers to find the flight that aligns with your budget, schedule, and travel plans while discovering St. Louis's renowned attractions and neighborhoods. Get all the essential information for flights departing from Luis Muñoz Marín International Airport (SJU) to Lambert-St. Louis International Airport (STL).

  • Fastest flight duration: around 5 hours non-stop
  • Route distance: roughly 2,000 miles (3,220 km)
  • Flights per week: around 15+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $105–$495, depending on seasonality and how far ahead you book

Flights from Luis Munoz Marin International Airport (SJU) to Lambert-St. Louis International Airport (STL)

Based on the latest travel bookings, here are the top airlines favored for flights from San Juan to St. Louis, featuring both non-stop and one-stop options. Many travelers often select flights with layovers at popular hubs like Orlando International Airport (MCO) with about a 2-hour layover, Hartsfield-Jackson Atlanta International Airport (ATL) and O'Hare International Airport (ORD), each with approximately 1 hour and 30 minutes of layover time. This variety allows you to compare prices, total travel times, and cabin classes to find the ideal itinerary.

  • Southwest Airlines: As a budget airline, Southwest provides non-stop, one-stop, and multi-stop options, with one-way ticket prices generally falling between $105 and $490. This carrier handles about 27% of departures on this route, featuring an average in-flight duration of 6 hours and 15 minutes, leading to a total travel time of approximately 8 hours.
  • American Airlines: This full-service airline offers one-stop and multi-stop routes, with one-way fares usually ranging from $115 to $540. It represents around 22% of the departures on this segment, with a typical flight time of 6 hours and 15 minutes, resulting in a total journey time of about 8 hours.
  • Delta: Operating as a full-service carrier, Delta provides one-stop options, with one-way fares typically between $110 and $455. This airline accounts for roughly 21% of departures on this route, featuring an in-flight duration of 6 hours and 15 minutes, leading to an overall travel time of around 8 hours including layovers.
  • Frontier Airlines: A budget-friendly choice, Frontier offers one-stop service with one-way fares usually ranging from $105 to $455. This airline makes up about 18% of the departures on this route, with a flight time of 6 hours and 15 minutes, resulting in an approximate total journey time of 8 hours, including layovers.
  • United: As a full-service airline, United provides both one-stop and multi-stop services, with one-way fares generally ranging from $110 to $550. It captures around 12% of departures on this route, featuring a typical flight duration of 6 hours and 15 minutes, leading to a total travel time of roughly 8 hours.

Travelers flying from San Juan to St. Louis can opt for an upgrade, as United offers first-class service on this route.

Best time to fly from San Juan (SJU) to St. Louis (STL)

The most popular months for travelers flying from San Juan to St. Louis are February, March, and April, when peak temperatures in St. Louis reach up to 56.1°F in April. If you prefer quieter travel, consider November, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 46.2°F. For better deals, May usually offers the lowest average one-way fare around $202. Flight availability peaks in February and March, with approximately 18 flights per week, making it easier to find convenient departure times. August has the fewest flights, with approximately 11 flights per week.

  • Cheapest time to fly: May usually offers good deals with average one-way fare around $202, roughly 16% cheaper than the yearly average.
  • More budget-friendly months to fly: November, April, and December typically offer average one-way fares of around $216.
  • Most flight options: February and March have the highest number of flights from San Juan to St. Louis, with approximately 18 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Average16$348
February34.9°F (1.6°C)High18$226
March46.4°F (8.0°C)High18$281
April56.1°F (13.4°C)High16$214
May66.6°F (19.2°C)Average12$202
June76.1°F (24.5°C)Average14$234
July78.6°F (25.9°C)Average16$241
August77.0°F (25.0°C)Average11$239
September70.9°F (21.6°C)Low15$232
October58.6°F (14.8°C)Low12$243
November46.2°F (7.9°C)Low14$211
December37.8°F (3.2°C)Average14$221

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from San Juan (SJU) to St. Louis (STL)

  • San Juan to St. Louis (SJU-SUS): Spirit of St. Louis Airport (SUS) is located approximately 16 miles from Lambert-St. Louis International Airport (STL).
  • San Juan to St. Louis (SJU-CPS): St. Louis Downtown Airport (CPS) is about 16 miles away from Lambert-St. Louis International Airport (STL).
  • San Juan to Springfield (SJU-SPI): Abraham Lincoln Capital Airport (SPI) is roughly 85 miles distant from Lambert-St. Louis International Airport (STL).

How to find the best prices for flights from San Juan (SJU) to St. Louis (STL)

Getting some of the best deals on flights from San Juan to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking 2-8 weeks in advance, which coincides with when most travelers make their reservations. Departures in the afternoon (12pm-6pm) often offer lower prices and are popular among flyers. Additionally, flying on Thursdays tends to be cheaper, while Tuesdays remain the most common travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Luis Munoz Marin International Airport

St. Louis welcomes travelers from San Juan with a range of transport options based on price, convenience, and proximity. For departures, Luis Munoz Marin International Airport is roughly a 15-minute drive (covering about 10 miles) from central San Juan. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is conveniently located just 0.1 miles away on foot, providing easy access to public transport.

Frequently asked questions

How much does a flight from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $70 and cheap return flights from $206 San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights usually range from $167 to $858, and return flights typically cost between $359 and $3448. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
September is the cheapest month to fly from San Juan (SJU) to St. Louis (STL), with average return fares around $345. This is about 27% lower than the average price throughout the year, as travel demand typically decreases after the summer season. Other cheap months to fly from San Juan to St. Louis include January and April.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter SJU to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Spirit Airlines is one of the cheapest airlines offering connecting flights from San Juan (SJU) to St. Louis (STL) with a layover in an unspecified location, starting from around $478. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from San Juan (SJU) to St. Louis (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN offers the most daily flights from SJU to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For flights from San Juan (SJU) to St. Louis (STL), September and January are the best months to fly. September has an average price of about $345, making it an economical choice, while January is also popular for its favorable flight schedules. These months offer a good mix of affordability and travel experience, based on booking data from the past year.*Prices based on flights available on Expedia in the last year.
How many flights per day from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are approximately 1 nonstop flights per day from Luis Munoz Marin Intl. (SJU) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Luis Munoz Marin International Airport (SJU) to Lambert-St. Louis International Airport (STL) typically departs at around 12:55 AM local time, operated by American Airlines. This is a seasonal service active in April and May. An early departure allows you to make the most of your time in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from San Juan (SJU) to St. Louis, MO (STL) are in the early morning, from 6am to 9am. About 40% of passengers prefer this time window. Many major carriers, including American Airlines and United Airlines, offer flights during this window. This timing is favored because it allows you to arrive in St. Louis with plenty of time to explore the city.
How long does it take to fly from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Flying nonstop from SJU to STL takes around 5 hours 20 minutes, with the route covering approximately 2,025 miles. Flights with a layover typically take 2 hours 10 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly first class between SJU and STL. First class cabins are available on:

  • United Airlines
  • Delta Air Lines
  • Spirit Airlines

How do I earn miles on a San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Luis Munoz Marin Intl. (SJU)?
From Luis Munoz Marin Intl. (SJU), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Liberty Intl. (EWR), Orlando Intl. (MCO), Miami Intl. (MIA) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your San Juan (SJU-Luis Munoz Marin Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Luis Munoz Marin Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$206
Distance
2024 mi

Book with confidence

San Juan to St. Louis Flights

The cheapest times to fly from San Juan to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Juan to St. Louis are during the month of October. You can find some of the cheapest flights from San Juan to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Juan to St. Louis

Sunday is one of the best days to book for cheap flights from San Juan to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Juan to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Juan to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $70 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Juan to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Juan to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Juan to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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