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St. Louis

$108+ 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 11/8. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
oct. 31 — nov. 71
vie. 10/31
vie. 11/7
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 September, 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 octubre 1, 2025.

Round-trip from

$225
(American Airlines)

One-way from

$108
(Southwest)

Popular in

June

Cheapest in

January

Average price

$384
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 ($91 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in October 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 octubre 1, 2025.

This American Airlines deal was found by Cheapflights users on 10/1. 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. 10/231:35 pmSJU - STL
2 stops11h 23mAmerican Airlines
dom. 10/266:00 amSTL - SJU
1 stop16h 59mAmerican Airlines
Deal found 10/1$225
This American Airlines deal was found by Cheapflights users on 9/30. 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.
mié. 10/297:45 amSJU - STL
2 stops11h 35mAmerican Airlines
lun. 11/36:00 amSTL - SJU
1 stop15h 52mAmerican Airlines
Deal found 9/30$229
This Priceline deal was found by Cheapflights users on 10/1. 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. 10/223:40 amSJU - STL
1 stop10h 06mFrontier
dom. 10/261:41 pmSTL - SJU
1 stop22h 21mFrontier
Deal found 10/1$276
This Frontier deal was found by Cheapflights users on 9/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/201:57 pmSJU - STL
1 stop12h 00mFrontier
lun. 11/244:13 pmSTL - SJU
1 stop8h 41mFrontier
Deal found 9/30$278
This Priceline deal was found by Cheapflights users on 10/1. 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.
dom. 11/233:59 amSJU - STL
1 stop21h 58mFrontier
vie. 11/284:13 pmSTL - SJU
1 stop18h 34mFrontier
Deal found 10/1$281
This Southwest deal was found by Cheapflights users on 9/30. 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.
mié. 11/122:05 pmSJU - STL
2 stops10h 05mSouthwest
dom. 11/167:50 amSTL - SJU
1 stop12h 10mSouthwest
Deal found 9/30$294
This American Airlines deal was found by Cheapflights users on 9/29. 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.
mié. 12/248:35 pmSJU - STL
1 stop17h 56mAmerican Airlines
lun. 12/296:00 pmSTL - SJU
1 stop13h 36mAmerican Airlines
Deal found 9/29$298
This American Airlines deal was found by Cheapflights users on 9/29. 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. 11/146:00 amSJU - STL
2 stops10h 53mAmerican Airlines
dom. 11/1610:44 amSTL - SJU
1 stop11h 08mAmerican Airlines
Deal found 9/29$301
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/112:05 amSJU - STL
1 stop10h 47mUnited Airlines
dom. 11/166:30 amSTL - SJU
1 stop7h 10mUnited Airlines
Deal found 9/30$315
This Frontier deal was found by Cheapflights users on 9/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/63:59 amSJU - STL
1 stop7h 41mFrontier
dom. 11/911:23 amSTL - SJU
2 stops13h 31mFrontier
Deal found 9/30$331
This American Airlines deal was found by Cheapflights users on 10/1. 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.
lun. 10/275:30 amSJU - STL
1 stop15h 50mAmerican Airlines
jue. 10/306:00 amSTL - SJU
1 stop16h 59mAmerican Airlines
Deal found 10/1$355

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 octubre 1, 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

mié. 10/22

1:05 am-10:49 am

2 stops10h 44m

Lambert-St Louis

dom. 10/26

6:30 am-2:40 pm

1 stop7h 10m

$225

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

jue. 10/23

11:56 am-11:56 pm

1 stop13h 00m

Lambert-St Louis

dom. 10/26

7:54 pm-2:08 pm

1 stop17h 14m

$225

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

vie. 10/24

3:00 pm-11:54 pm

1 stop9h 54m

Lambert-St Louis

dom. 10/26

5:30 am-11:54 pm

1 stop17h 24m

$229

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

mié. 10/29

7:45 am-6:20 pm

2 stops11h 35m

Lambert-St Louis

lun. 11/3

6:00 am-11:52 pm

1 stop15h 52m

$229

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

vie. 11/14

6:00 am-2:53 pm

2 stops10h 53m

Lambert-St Louis

dom. 11/16

10:44 am-11:52 pm

1 stop11h 08m

$301

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

mar. 11/11

2:05 am-2:24 pm

2 stops14h 19m

Lambert-St Louis

dom. 11/16

6:30 am-3:40 pm

1 stop7h 10m

$315

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

sáb. 12/13

8:50 am-12:00 pm

Nonstop5h 10m

$108

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

sáb. 11/8

8:50 am-12:00 pm

Nonstop5h 10m

$108

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

mié. 11/12

2:05 am-10:52 am

1 stop10h 47m

$113

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

vie. 10/31

7:15 am-2:43 pm

1 stop8h 28m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/30

Showing 1-10 of 16 results
1
2

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 September 26, 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 octubre 1, 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 in the morning tend to be the most expensive. A flight at noon could potentially save you up to 56% 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 octubre 1, 2025.
See what other customers who have flown with Southwest, Delta, and United 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
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,030 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,154 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 5 different airlines.

  • How long is the flight from San Juan to St. Louis?

    Airlines like United Airlines and American Airlines fly from San Juan to St. Louis in about 10h 44m. The time it takes to get you to your destination can typically vary by up to 2h 16m. Airlines will cover a distance of 2024 mi. This flight may include one or multiple stops.

  • 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 $128 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $212 and $254 round-trip. These flights start at 67% lower than the current average price 3 months from now.

  • What are the cheapest flights from San Juan to St. Louis?

    While on average a flight from San Juan to St. Louis is generally $273, our data shows the cheapest flight currently is $108. When looking at the most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), you can expect to pay $225 for that flight.

  • 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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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 Kansas City flights
Luis Munoz Marin Intl to St. Louis flights

Top 5 airlines flying from San Juan to St. Louis

Discover the top 5 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 octubre 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$261FlexibilityNo cancel feeOn-time62%
DeltaCheapest$212Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$414FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$255Average$462FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$342Average$609FlexibilityNo cancel feeOn-time63%

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