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$58+ Cheap flights from St. Louis (STL) to San Juan

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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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The best prices from Lambert-St Louis to San Juan are usually found in April or September, booked 90 days in advance, depart on a Wednesday or Tuesday and return on a Saturday

Cheap flight deals from St. Louis to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to San Juan (PR1). 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 January 21, 2025.

Round-trip from

$170
(Frontier)

One-way from

$58
(eDestinos)

Popular in

July

Cheapest in

April

Average price

$363
From Lambert-St Louis to San Juan
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One-way flight from Lambert-St Louis to San Juan
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High demand for flights, 9% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in January 2025
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Find flight deals from St. Louis to San Juan

Cheapest flights from St. Louis to San Juan
Explore the most affordable flight options available from St. Louis to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.

This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/85:05 pmSTL - SJU
1 stop19h 43mFrontier
Thu 2/1310:31 pmSJU - STL
1 stop27h 12mFrontier
Deal found 1/20$174
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/55:05 pmSTL - SJU
1 stop14h 47mMultiple Airlines
Wed 2/122:19 pmSJU - STL
2 stops26h 23mMultiple Airlines
Deal found 1/20$205
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Mon 2/101:02 pmSTL - SJU
2 stops9h 34mUnited Airlines
Wed 2/122:05 amSJU - STL
2 stops14h 31mUnited Airlines
Deal found 1/20$265
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Mon 2/245:13 amSTL - SJU
1 stop16h 42mAmerican Airlines
Tue 3/46:00 amSJU - STL
2 stops10h 52mAmerican Airlines
Deal found 1/20$290
This Delta deal was found by Cheapflights users on 1/20. 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 9/246:00 amSTL - SJU
1 stop9h 08mDelta
Mon 9/292:51 pmSJU - STL
1 stop9h 48mDelta
Deal found 1/20$295
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/95:38 pmSTL - SJU
1 stop22h 02mSpirit Airlines
Fri 3/145:45 pmSJU - STL
1 stop16h 19mSpirit Airlines
Deal found 1/20$316
This Southwest deal was found by Cheapflights users on 1/20. 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.
Tue 3/43:15 pmSTL - SJU
2 stops7h 25mSouthwest
Tue 3/115:35 amSJU - STL
2 stops9h 00mSouthwest
Deal found 1/20$450

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

Customize your flight search to find flights from St. Louis to San Juan 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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 2/8

5:05 pm-2:48 pm

1 stop19h 43m

San Juan Luis Munoz Marin Intl

Thu 2/13

10:31 pm-11:43 pm

1 stop27h 12m

$174

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 2/5

5:05 pm-9:52 am

1 stop14h 47m

San Juan Luis Munoz Marin Intl

Wed 2/12

2:19 pm-2:42 pm

2 stops26h 23m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 2/10

1:02 pm-12:36 am

2 stops9h 34m

San Juan Luis Munoz Marin Intl

Wed 2/12

2:05 am-2:36 pm

2 stops14h 31m

$265

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 2/24

5:13 am-11:55 pm

1 stop16h 42m

San Juan Luis Munoz Marin Intl

Tue 3/4

6:00 am-2:52 pm

2 stops10h 52m

$290

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 3/9

5:38 pm-4:40 pm

1 stop22h 02m

San Juan Luis Munoz Marin Intl

Fri 3/14

5:45 pm-9:04 am

1 stop16h 19m

$316

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 3/4

3:15 pm-12:40 am

2 stops7h 25m

San Juan Luis Munoz Marin Intl

Tue 3/11

5:35 am-1:35 pm

2 stops9h 00m

$450

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 4/23

5:52 pm-2:49 am

1 stop7h 57m

$65

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 2/9

4:28 pm-9:21 am

1 stop14h 53m

$83

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 3/25

10:19 am-8:10 pm

1 stop8h 51m

$133

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 2/10

12:00 pm-12:04 am

2 stops10h 04m

$136

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 14 results
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Best time to book a flight from St. Louis to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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 San Juan

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to San Juan. Price data was last updated on January 17, 2025.

The price you pay for your flight from St. Louis to San Juan may vary depending on when you book. For the best chance of a lower fare, look to book 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, September is the cheapest month in which you can book a flight from St. Louis to San Juan (average of $254). Flying from St. Louis to San Juan in March is currently the most expensive (average of $378). 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 SJU?

Find hourly flight availability from St. Louis to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2025.

When flying from St. Louis to San Juan, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 38% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to San Juan. Price data was last updated on January 21, 2024.

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

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan 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 San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, 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 San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated January 21, 2025.
See what other customers who have flown with Frontier, United Airlines and Southwest from St. Louis to San Juan have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,696 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to San Juan. 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 San Juan?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to San Juan. On average, Lambert-St Louis has 0 outbound flights to San Juan per day from 6 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    Our cheapest airline available from St. Louis to San Juan is Frontier. Our recent data shows that you can find tickets from as low as $170 on this airline. Additional options worth looking into are Spirit Airlines and United Airlines, starting at $221 and $265 round-trip. Frontier is 61% cheaper than the average price of flights available within the next 90 days to this destination.

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

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $58. Frontier flights start at $65 while deals on Delta start at $133 one-way.

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

    The cheapest flight price from St. Louis to San Juan is $444. On average you can expect to pay $660. The most popular route, (Lambert-St Louis - San Juan Luis Munoz Marin Intl), can usually be booked for $134.

  • Where are the most common layover locations when flying from St. Louis to San Juan?

    St. Louis to San Juan flights have a layover in Charlotte most often. Orlando sees the next most layovers on St. Louis to San Juan flights.

  • What are some popular things to do or see while on a layover in Charlotte?

    The majority of Charlotte visitors spend their time at Carowind, Mint Museum Uptown, and North Carolina Blumenthal Performing Arts Center. Carowind, Mint Museum Uptown, and North Carolina Blumenthal Performing Arts Center are located about 8.2 mi, 5.4 mi, and 5.8 mi, respectively from Charlotte Douglas. Travelers in need of a car in Charlotte can rent one for about $43 per day.

  • What are some popular points of interest to see during a layover in Orlando?

    Orlando travelers tend to visit Walt Disney World Resort, Universal Orlando Resort, and International Drive more than any other notable places. Walt Disney World Resort, Universal Orlando Resort, and International Drive are located about 16.2 mi, 10.3 mi, and 9.9 mi, respectively from Orlando. Travelers can book a car rental at Orlando for about $31 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for St. Louis to San Juan flights?

    Flights departing from St. Louis and landing in San Juan layover in Atlanta least frequently.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to San Juan 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 San Juan?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to San Juan (average of $254). Flying from St. Louis to San Juan in March is currently the most expensive (average of $378). 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.

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Alternative routes for St. Louis to San Juan

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

Top 6 airlines flying from St. Louis to San Juan

Discover the top 6 airlines that operate flights from St. Louis to San Juan. 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$301FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$174Average$312FlexibilityNo cancel feeOn-time65%
DeltaCheapest$254Average$443FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$554FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$269Average$514FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$375Average$576FlexibilityNo cancel feeOn-time63%
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