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$74+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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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 February 20, 2025.

Round-trip from

$177
(FlightHub)

One-way from

$74
(FlightHub)

Popular in

June

Cheapest in

January

Average price

$345
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. 8% potential increase in price ($34 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This FlightHub deal was found by Cheapflights users on 2/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/59:30 pmSJU - STL
1 stop28h 19mFrontier
Fri 3/711:00 amSTL - SJU
1 stop9h 44mFrontier
Deal found 2/19$177
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/76:45 pmSJU - STL
1 stop16h 24mSpirit Airlines
Tue 3/115:38 pmSTL - SJU
2 stops19h 29mSpirit Airlines
Deal found 2/20$206
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 3/1211:36 amSJU - STL
2 stops10h 05mAmerican Airlines
Wed 3/198:49 amSTL - SJU
2 stops10h 35mAmerican Airlines
Deal found 2/19$290
This Mytrip deal was found by Cheapflights users on 2/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/105:39 pmSJU - STL
1 stop24h 03mMultiple Airlines
Sat 3/151:00 pmSTL - SJU
2 stops36h 27mMultiple Airlines
Deal found 2/19$332
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Tue 3/111:05 amSJU - STL
2 stops12h 07mUnited Airlines
Wed 3/1910:55 amSTL - SJU
1 stop8h 48mUnited Airlines
Deal found 2/19$413
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/113:11 pmSJU - STL
1 stop8h 53mDelta
Wed 4/164:11 pmSTL - SJU
1 stop6h 04mDelta
Deal found 2/20$414
This Southwest deal was found by Cheapflights users on 2/19. 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.
Tue 5/206:05 amSJU - STL
2 stops11h 40mSouthwest
Fri 5/239:10 pmSTL - SJU
1 stop14h 00mSouthwest
Deal found 2/19$511
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/286:05 amSJU - STL
2 stops18h 54mAlaska Airlines
Sun 3/306:44 amSTL - SJU
2 stops30h 28mAlaska Airlines
Deal found 2/18$1,630

Find flights from San Juan to St. Louis within your budget

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 February 20, 2025.

Fly from

San Juan

Fly to

St. Louis

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 3/12

9:35 pm-11:49 pm

1 stop27h 14m

Lambert-St Louis

Wed 3/19

5:24 pm-9:36 pm

1 stop27h 12m

$156

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 3/7

6:45 pm-9:09 am

1 stop16h 24m

Lambert-St Louis

Tue 3/11

5:38 pm-2:07 pm

2 stops19h 29m

$206

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 3/12

11:36 am-8:41 pm

2 stops10h 05m

Lambert-St Louis

Wed 3/19

8:49 am-8:24 pm

2 stops10h 35m

$290

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 3/10

5:39 pm-4:42 pm

1 stop24h 03m

Lambert-St Louis

Sat 3/15

1:00 pm-2:27 am

2 stops36h 27m

$332

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 3/11

1:05 am-12:12 pm

2 stops12h 07m

Lambert-St Louis

Wed 3/19

10:55 am-8:43 pm

1 stop8h 48m

$413

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 4/11

3:11 pm-11:04 pm

1 stop8h 53m

Lambert-St Louis

Wed 4/16

4:11 pm-11:15 pm

1 stop6h 04m

$414

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 5/20

6:05 am-4:45 pm

2 stops11h 40m

Lambert-St Louis

Fri 5/23

9:10 pm-12:10 pm

1 stop14h 00m

$511

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 3/28

6:05 am-11:59 pm

2 stops18h 54m

Lambert-St Louis

Sun 3/30

6:44 am-2:12 pm

2 stops30h 28m

$1,630

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 5/6

9:30 pm-12:06 am

1 stop27h 36m

$74

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 5/19

4:46 pm-6:32 pm

1 stop26h 46m

$95

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

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.

Travel insights for flights from San Juan to St. Louis

Get recent, data-driven insights about flights from San Juan to St. Louis including ideal travel times, pricing trends, and more.

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 February 14, 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 February 20, 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 63% on airfare.

What is the cheapest day to fly from San Juan to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from San Juan to St. Louis. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Juan to St. Louis flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 February 20, 2025.
Read through reviews of airlines operating flights from San Juan to St. Louis, such as Southwest, Alaska Airlines and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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.

  • 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 $177 on this airline. Additional options worth looking into are Spirit Airlines and American Airlines, starting at $206 and $384 round-trip. These flights start at 55% 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 Frontier. According to our data, you can fly for as low as $74. Users have also found prices from $95 and $133 on Spirit Airlines and Delta, respectively.

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

    While on average a flight from San Juan to St. Louis is generally $278, our data shows the cheapest flight currently is $268. When looking at the most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), you can expect to pay $156 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 San Juan?

Book flights to San Juan if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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 St. Louis flights
Luis Munoz Marin Intl to Kansas City 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$163Average$242FlexibilityNo cancel feeOn-time62%
DeltaCheapest$244Average$374FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$255Average$552FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$255Average$436FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$279Average$554FlexibilityNo cancel feeOn-time63%
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