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Puerto Rico

$105+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
abr. 22 — abr. 291
mar. 4/22
mar. 4/29
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 abril 17, 2025.

Round-trip from

$289
(CheapOair)

One-way from

$105
(American Airlines)

Popular in

July

Cheapest in

April

Average price

$324

Good round-trip deal

$590 or less
From Lambert-St Louis to Puerto Rico
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One-way flight from Lambert-St Louis to Puerto Rico
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Highest demand for flights based on searches. 8% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Puerto Rico.
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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 abril 17, 2025.

This United Airlines deal was found by Cheapflights users on 4/16. 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.
mié. 5/76:30 amSTL - SJU
2 stops13h 08mUnited Airlines
sáb. 5/107:00 amSJU - STL
1 stop9h 49mUnited Airlines
Deal found 4/16$209
This Delta deal was found by Cheapflights users on 4/17. 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.
jue. 7/179:00 amSTL - SJU
1 stop9h 44mDelta
mié. 7/232:15 pmSJU - STL
1 stop7h 15mDelta
Deal found 4/17$245
This American Airlines deal was found by Cheapflights users on 4/16. 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. 5/77:10 amSTL - SJU
1 stop12h 23mAmerican Airlines
jue. 5/85:25 amSJU - STL
1 stop16h 33mAmerican Airlines
Deal found 4/16$285
This CheapOair deal was found by Cheapflights users on 4/17. 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.
vie. 5/25:55 pmSTL - SJU
1 stop7h 56mMultiple Airlines
mar. 5/69:25 amSJU - STL
1 stop8h 50mMultiple Airlines
Deal found 4/17$289
This Mytrip deal was found by Cheapflights users on 4/17. 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.
dom. 5/1810:10 amSTL - SJU
1 stop7h 57mSpirit Airlines
sáb. 5/248:12 pmSJU - STL
1 stop14h 03mSpirit Airlines
Deal found 4/17$297
This Frontier deal was found by Cheapflights users on 4/16. 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. 5/85:45 pmSTL - SJU
1 stop8h 06mFrontier
dom. 5/114:39 pmSJU - STL
1 stop8h 27mFrontier
Deal found 4/16$298
This Southwest deal was found by Cheapflights users on 4/16. 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.
sáb. 5/31:25 pmSTL - SJU
Nonstop4h 25mSouthwest
sáb. 5/173:20 pmSJU - STL
1 stop7h 40mSouthwest
Deal found 4/16$363
This United Airlines deal was found by Cheapflights users on 4/16. 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.
dom. 5/45:29 pmSTL - CPX
2 stops22h 52mUnited Airlines
mié. 5/1410:48 amCPX - STL
2 stops12h 15mUnited Airlines
Deal found 4/16$1,437

Cheapflights Fare Finder

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 abril 17, 2025.
Use the filters below to find and compare flights from St. Louis to Puerto Rico that are best for you.

Fly from

St. Louis

Fly to

Puerto Rico

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

mié. 5/7

6:00 am-3:40 pm

1 stop8h 40m

San Juan Luis Munoz Marin Intl

vie. 5/9

1:05 am-2:50 pm

2 stops14h 45m

$209

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

jue. 7/17

9:00 am-7:44 pm

1 stop9h 44m

San Juan Luis Munoz Marin Intl

mié. 7/23

2:15 pm-8:30 pm

1 stop7h 15m

$245

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

mié. 5/7

7:10 am-8:33 pm

1 stop12h 23m

San Juan Luis Munoz Marin Intl

jue. 5/8

5:25 am-8:58 pm

1 stop16h 33m

$285

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

vie. 5/2

5:55 pm-2:51 am

1 stop7h 56m

San Juan Luis Munoz Marin Intl

mar. 5/6

9:25 am-5:15 pm

1 stop8h 50m

$289

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

dom. 5/18

10:10 am-7:07 pm

1 stop7h 57m

San Juan Luis Munoz Marin Intl

sáb. 5/24

8:12 pm-9:15 am

1 stop14h 03m

$297

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

jue. 5/8

5:45 pm-2:51 am

1 stop8h 06m

San Juan Luis Munoz Marin Intl

dom. 5/11

4:39 pm-12:06 am

1 stop8h 27m

$298

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

sáb. 5/3

1:25 pm-6:50 pm

Nonstop4h 25m

San Juan Luis Munoz Marin Intl

sáb. 5/17

3:20 pm-10:00 pm

1 stop7h 40m

$363

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

dom. 5/4

5:29 pm-5:21 pm

2 stops22h 52m

Culebra

mié. 5/14

10:48 am-10:03 pm

2 stops12h 15m

$1,437

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

mar. 8/12

10:15 am-8:38 pm

1 stop9h 23m

$105

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

sáb. 5/17

10:10 am-10:45 am

2 stops23h 35m

$120

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 15 results
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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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Puerto Rico

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 December is currently the most expensive (average of $336). 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 abril 17, 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 abril 17, 2025.
Read through reviews of airlines operating flights from St. Louis to Puerto Rico, such as Southwest, Delta and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,280 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,916 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,667 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
7,926 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.1

Comfort

8.0

Entertainment

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 American Airlines. According to our data, you can fly for as low as $105. Users have also found prices from $120 and $123 on Spirit Airlines and United Airlines, respectively.

  • What are the cheapest flights from St. Louis to Puerto Rico?

    The cheapest flight price from St. Louis to Puerto Rico is $590. On average you can expect to pay $676. The most popular route, (Lambert-St Louis - San Juan Luis Munoz Marin Intl), can usually be booked for $209.

  • 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 December is currently the most expensive (average of $336). 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

Browse thousands of different options on Cheapflights for your next trip

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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 abril 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$267FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$166Average$312FlexibilityNo cancel feeOn-time65%
DeltaCheapest$254Average$417FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$261Average$398FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$265Average$500FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$374Average$596FlexibilityNo cancel feeOn-time63%

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