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$65+ Cheap flights from St. Louis (STL) to Puerto Rico

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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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Cheap flight deals from St. Louis to Puerto Rico

Keep the following information in mind while searching for St. Louis to Puerto Rico flight deals. Data was last updated February 20, 2025.

Round-trip from

$158
(Mytrip)

One-way from

$65
(Frontier)

Popular in

July

Cheapest in

April

Average price

$440
From Lambert-St Louis to Puerto Rico
Search Deals
One-way flight from Lambert-St Louis to Puerto Rico
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($47 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 February 2025
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Find flight deals from St. Louis to Puerto Rico

Cheapest flights from St. Louis to Puerto Rico
Explore the most affordable flight options available from St. Louis to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

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.
Sat 5/35:47 pmSTL - SJU
1 stop8h 04mFrontier
Sat 5/109:30 pmSJU - STL
1 stop27h 36mFrontier
Deal found 2/20$158
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:47 pmSTL - SJU
1 stop8h 04mMultiple Airlines
Mon 5/194:46 pmSJU - STL
1 stop26h 46mMultiple Airlines
Deal found 2/19$165
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/137:37 pmSTL - SJU
2 stops28h 34mSpirit Airlines
Mon 5/194:46 pmSJU - STL
1 stop26h 46mSpirit Airlines
Deal found 2/19$185
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/33:43 pmSTL - SJU
1 stop7h 11mUnited Airlines
Tue 5/61:05 amSJU - STL
2 stops14h 42mUnited Airlines
Deal found 2/20$265
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/31:25 pmSTL - SJU
Nonstop4h 25mSouthwest
Sat 5/104:00 pmSJU - STL
Nonstop5h 00mSouthwest
Deal found 2/20$285
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.
Wed 5/2810:10 amSTL - SJU
1 stop8h 24mDelta
Tue 6/32:04 pmSJU - STL
1 stop7h 29mDelta
Deal found 2/20$314
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:00 amSTL - SJU
2 stops9h 36mAmerican Airlines
Thu 5/151:10 pmSJU - STL
1 stop9h 17mAmerican Airlines
Deal found 2/20$321
This United 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/46:15 amSTL - CPX
2 stops10h 06mUnited Airlines
Wed 5/1410:48 amCPX - STL
2 stops13h 58mUnited Airlines
Deal found 2/20$1,726

Find flights from St. Louis to Puerto Rico within your budget

Customize your flight search to find flights from St. Louis to Puerto Rico 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

St. Louis

Fly to

Puerto Rico

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

5:47 pm-2:51 am

1 stop8h 04m

San Juan Luis Munoz Marin Intl

Sat 5/10

9:30 pm-12:06 am

1 stop27h 36m

$158

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 5/13

5:47 pm-2:51 am

1 stop8h 04m

San Juan Luis Munoz Marin Intl

Mon 5/19

4:46 pm-6:32 pm

1 stop26h 46m

$165

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 5/13

7:37 pm-1:11 am

2 stops28h 34m

San Juan Luis Munoz Marin Intl

Mon 5/19

4:46 pm-6:32 pm

1 stop26h 46m

$185

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

3:43 pm-11:54 pm

1 stop7h 11m

San Juan Luis Munoz Marin Intl

Tue 5/6

1:05 am-2:47 pm

2 stops14h 42m

$265

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

1:25 pm-6:50 pm

Nonstop4h 25m

San Juan Luis Munoz Marin Intl

Sat 5/10

4:00 pm-8:00 pm

Nonstop5h 00m

$285

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 5/28

10:10 am-7:34 pm

1 stop8h 24m

San Juan Luis Munoz Marin Intl

Tue 6/3

2:04 pm-8:33 pm

1 stop7h 29m

$314

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 5/9

6:00 am-4:36 pm

2 stops9h 36m

San Juan Luis Munoz Marin Intl

Thu 5/15

1:10 pm-9:27 pm

1 stop9h 17m

$321

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Sun 5/4

6:15 am-5:21 pm

2 stops10h 06m

Culebra

Wed 5/14

10:48 am-11:46 pm

2 stops13h 58m

$1,726

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 5/19

5:47 pm-2:51 am

1 stop8h 04m

$65

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 6/3

7:37 pm-3:41 pm

1 stop19h 04m

$124

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 15 results
1
2

Best time to book a flight from St. Louis to Puerto Rico

Have a flexible travel schedule? Discover the best time to fly to Puerto Rico from St. Louis 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 St. Louis to Puerto Rico

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

What is the cheapest month to book a flight from St. Louis to Puerto Rico?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $254). Flying from St. Louis to Puerto Rico in March is currently the most expensive (average of $363). 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 STL to PR?

Find hourly flight availability from St. Louis to Puerto Rico. 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.

When flying from St. Louis to Puerto Rico, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Puerto Rico ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit Puerto Rico when rainfall is around 2.2 in.

Temperature in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Puerto Rico, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

Reviews of airlines servicing Puerto Rico

Get insights into the airlines that provide service to Puerto Rico. 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 Puerto Rico. Reviews last updated February 20, 2025.
Read through reviews of airlines operating flights from St. Louis to Puerto Rico, such as Southwest, Alaska Airlines and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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

Food

7.1

Crew

8.7

Overall

8.1

Comfort

8.1

Boarding

8.2

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 St. Louis to Puerto Rico. 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 from for flights from St. Louis to Puerto Rico?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Puerto Rico. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $65. Users have also found prices from $119 and $133 on Spirit Airlines and Delta, respectively.

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

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

  • How can I find direct flights from St. Louis to Puerto Rico?

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

  • Can I find deals for business class flights from St. Louis to Puerto Rico?

    Yes. Cheapflights offers flight deals from St. Louis to Puerto Rico 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 St. Louis to Puerto Rico?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $254). Flying from St. Louis to Puerto Rico in March is currently the most expensive (average of $363). 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

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Alternative routes for St. Louis to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from St. Louis to Puerto Rico

Discover the top 6 airlines that operate flights from St. Louis to Puerto Rico. 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$140Average$287FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$310FlexibilityNo cancel feeOn-time65%
DeltaCheapest$254Average$434FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$447FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$277Average$511FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$392Average$587FlexibilityNo cancel feeOn-time63%
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