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St. Louis

$98+ Cheap flights from San Juan to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to Lambert-St Louis are usually found in January or April, booked 65 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from San Juan to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated agosto 14, 2025.

Round-trip from

$205
(American Airlines)

One-way from

$103
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$342
From San Juan to Lambert-St Louis
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One-way flight from San Juan to Lambert-St Louis
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Highest demand for flights based on searches. 18% potential increase in price ($88 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from San Juan to St. Louis

Cheapest flights from San Juan to St. Louis
Explore the most affordable flight options available from San Juan to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/267:05 pmSJU - STL
2 stops15h 11mAmerican Airlines
vie. 10/35:18 amSTL - SJU
1 stop7h 57mAmerican Airlines
Deal found 8/14$205
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/206:25 amSJU - STL
1 stop16h 30mAmerican Airlines
dom. 11/236:45 pmSTL - SJU
1 stop16h 19mAmerican Airlines
Deal found 8/13$255
This Priceline deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/44:42 pmSJU - STL
1 stop21h 20mFrontier
dom. 9/71:52 pmSTL - SJU
1 stop9h 07mFrontier
Deal found 8/13$277
This Priceline deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/123:59 amSJU - STL
1 stop11h 28mFrontier
dom. 11/162:22 pmSTL - SJU
1 stop10h 32mFrontier
Deal found 8/12$285
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/511:10 amSJU - STL
1 stop8h 05mSouthwest
dom. 9/78:50 pmSTL - SJU
1 stop12h 25mSouthwest
Deal found 8/13$335
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/206:25 amSJU - STL
1 stop16h 30mAmerican Airlines
lun. 11/247:12 amSTL - SJU
2 stops8h 40mAmerican Airlines
Deal found 8/12$340
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/57:05 pmSJU - STL
2 stops15h 11mAmerican Airlines
dom. 9/76:00 amSTL - SJU
2 stops11h 15mAmerican Airlines
Deal found 8/13$351
This American Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/236:25 amSJU - STL
1 stop16h 30mAmerican Airlines
mar. 12/25:00 amSTL - SJU
1 stop6h 04mAmerican Airlines
Deal found 8/14$359
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/42:40 pmSJU - STL
1 stop6h 50mSouthwest
mar. 9/95:25 amSTL - SJU
1 stop11h 00mSouthwest
Deal found 8/12$380

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Juan to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 14, 2025.
Use the filters below to find and compare flights from San Juan to St. Louis that are best for you.

Fly from

San Juan

Fly to

St. Louis

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

vie. 9/26

7:05 pm-9:16 am

2 stops15h 11m

Lambert-St Louis

vie. 10/3

5:18 am-2:15 pm

1 stop7h 57m

$205

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 11/13

6:20 pm-11:39 pm

1 stop7h 19m

Lambert-St Louis

dom. 11/16

7:20 am-5:15 pm

1 stop7h 55m

$205

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 11/20

6:25 am-8:55 pm

1 stop16h 30m

Lambert-St Louis

dom. 11/23

6:45 pm-1:04 pm

1 stop16h 19m

$255

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 9/4

4:42 pm-1:02 pm

1 stop21h 20m

Lambert-St Louis

dom. 9/7

1:52 pm-11:59 pm

1 stop9h 07m

$277

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

vie. 9/5

12:50 pm-10:02 pm

1 stop10h 12m

Lambert-St Louis

dom. 9/7

6:00 am-1:30 pm

1 stop6h 30m

$278

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 9/25

3:39 am-1:02 pm

1 stop10h 23m

Lambert-St Louis

vie. 10/3

1:57 pm-11:59 pm

1 stop9h 02m

$278

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 11/13

2:41 pm-12:05 am

2 stops11h 24m

Lambert-St Louis

dom. 11/16

6:00 am-11:47 pm

1 stop15h 47m

$278

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

sáb. 11/15

8:50 am-12:00 pm

Nonstop5h 10m

$98

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

mar. 10/14

1:05 am-10:49 am

2 stops10h 44m

$103

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 11/27

6:30 am-12:04 pm

1 stop7h 34m

$103

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 15 results
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Best time to book a flight from San Juan to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from San Juan with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Juan to St. Louis

How far ahead should I book a flight from San Juan to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from San Juan to St. Louis. Price data was last updated on August 8, 2025.

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Juan to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from San Juan to St. Louis?

Currently, August is the cheapest month in which you can book a flight from San Juan to St. Louis (average of $311). Flying from San Juan to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SJU to STL?

Find hourly flight availability from San Juan to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 14, 2025.

One of the essential ways to save on airfare from San Juan to St. Louis is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 60% on airfare.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated agosto 14, 2025.
See what other customers who have flown with Southwest, Delta, and American Airlines from San Juan to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,217 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Juan to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from San Juan?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to St. Louis from San Juan. Booking flights from San Juan to Lambert-St Louis (STL) should be relatively easy as there are 0 daily inbound flights from San Juan from 4 different airlines.

  • What are the cheapest airlines flying from San Juan to St. Louis round-trip?

    Our cheapest airline available from San Juan to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $163 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $244 and $254 round-trip. These flights start at 58% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from San Juan to St. Louis one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $103. Users have also found prices from $109 and $117 on American Airlines and Spirit Airlines, respectively.

  • Can I find deals for flights from San Juan to St. Louis that include hotel bookings?

    Yes. In addition to deals on San Juan to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Juan to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Juan to St. Louis.

  • Can I find deals for business class flights from San Juan to St. Louis?

    Yes. Cheapflights offers flight deals from San Juan to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Juan to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from San Juan to St. Louis (average of $311). Flying from San Juan to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

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Alternative routes for San Juan to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Luis Munoz Marin Intl to St. Louis flights
Luis Munoz Marin Intl to Kansas City flights

Top 4 airlines flying from San Juan to St. Louis

Discover the top 4 airlines that operate flights from San Juan to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$163Average$240FlexibilityNo cancel feeOn-time62%
DeltaCheapest$244Average$371FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$415FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$279Average$580FlexibilityNo cancel feeOn-time63%

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