Cheap flights from St. Louis (STL) to San Juan (SJU)

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How to find the cheapest flight from
St. Louis (STL) to San Juan (SJU)

All the information you need to plan the best STL to SJU flight in 2021: compare St. Louis to San Juan flight prices with the expected peak season, weather and rainfall in San Juan.
STL - PR1
Price
$336 - $655
PR1
Temperature
77 - 82.4 °F
PR1
Precipitation
2.2 - 6.1 inches

Popular in

December

High demand for flights, 40% potential price rise

Cheapest in

August

Best time to find cheap flights, 14% potential price drop

Round-trip from

$336

From Lambert-St Louis to San Juan

One-way from

$153

One-way flight from Lambert-St Louis to San Juan

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
When is the cheapest time to fly from St. Louis to San Juan (STL - PR1)?

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

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

Travelers have found it’s best to book a flight 15 days in advance to save up to 1% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 15 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to San Juan 1-2 weeks in advance for as low as $333, or $342 for flights within the next 24 hours.

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

August is one of the best times of the year to fly to San Juan from St. Louis. Prices for August average $391 per person but you can even find prices for as low as $165. The most expensive prices can be found in the month of December. Opting for a August flight can save you 67% on your journey compared to booking in August

Cheap flights from St. Louis to San Juan in October, November 2021

The best prices found for STL to SJU flights for October, November
27 Oct - 3 Nov
$125pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
22 Oct - 29 Oct
$134pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
27 Oct - 3 Nov
$135pp
STL
Lambert-St Louis
Spirit Airlines
   
2 STOPS
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis

Lambert-St Louis to San Juan 2021 flight deals

Cheap flights to San Juan from St. Louis found for this year
27 Oct - 3 Nov
$125pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
22 Oct - 29 Oct
$134pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
27 Oct - 3 Nov
$135pp
STL
Lambert-St Louis
Spirit Airlines
   
2 STOPS
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis

Last minute flights from St. Louis to San Juan

Late deals on round-trip flights to San Juan from St. Louis, departing today and this week
27 Oct - 3 Nov
$125pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
27 Oct - 3 Nov
$135pp
STL
Lambert-St Louis
Spirit Airlines
   
2 STOPS
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
 
1 STOP
STL
Lambert-St Louis
28 Oct - 1 Nov
$142pp
STL
Lambert-St Louis
Spirit Airlines
 
1 STOP
SJU
San Juan Luis Munoz Marin Intl
SJU
San Juan Luis Munoz Marin Intl
Spirit Airlines
   
2 STOPS
STL
Lambert-St Louis

One-way flights to San Juan from St. Louis

The cheapest one-way flights from St. Louis to San Juan
11:41 am - 10:14 pm
Frontier
1 Stop
9h 33m
STL - SJU
Frontier
$153
Kiwi.com
4:55 am - 11:20 pm
United Airlines
1 Stop
16h 25m
STL - SJU
United Airlines
$177
United
1:30 am - 1:35 pm
Multiple Airlines
3 Stops
34h 05m
STL - SJU
Multiple Airlines
$236
mytrip.com

Related info for your journey

Useful info, stats and facts about <span class="emphasized">St. Louis</span> to <span class="emphasized">San Juan</span> flights.

Flight FAQs

From St. Louis to San Juan

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 1 outbound flight to San Juan per day from 6 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

Which airlines flying from Lambert-St Louis to San Juan have flexible cancellations due to COVID-19?

American Airlines, Delta, and United Airlines are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from St. Louis to San Juan for under $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to San Juan for under $200. The cheapest flight booked recently is on Spirit Airlines for just $122, but on average you can expect to pay $149.

Are there last-minute flights available from St. Louis to San Juan for under $200?

There are currently 20+ open flights from St. Louis to San Juan within the next 7 days for less than $200.

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 Spirit Airlines. Our recent data shows that you can find tickets from as low as $122 on this airline. An additional option worth looking into is Frontier, starting at $153. Spirit Airlines is 68% 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 Frontier, which is currently one of the cheapest options available, starting at $74. Spirit Airlines flights start at $88 while deals on United Airlines start at $177 one-way.

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

The cheapest flight price from St. Louis to San Juan is $148. On average you can expect to pay $691. The most popular route, (Lambert-St Louis - San Juan Luis Munoz Marin Intl), can usually be booked for $157.

What are the most popular airlines that fly from St. Louis to San Juan?

Consider Major Airline, American Airlines or Delta when booking your flight. These represent the most popular airlines when flying from St. Louis to San Juan.

COVID Restrictions

View COVID Travel Restrictions for San Juan, Puerto Rico

Do I need a COVID test to fly to San Juan from St. Louis?

Information is based on travel restrictions from Lambert-St Louis to San Juan

Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter San Juan.

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) test taken 72 hours before departing to San Juan.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering San Juan.

Documents
Travel Declaration Form - Must be completed prior to travel to Puerto Rico.


Do I need a test to fly back to St. Louis from San Juan?

Returning to Lambert-St Louis from San Juan

COVID-19 testing requirements
Visitors from San Juan must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from San Juan are not required to quarantine after entering Lambert-St Louis.

Hide COVID Travel Restrictions for San Juan, Puerto Rico

Alternative routes for St. Louis to San Juan

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for San Juan

Things to know before you go - useful duration and weather info for your trip from St. Louis to San Juan.
Today's exchange rate
$1 = $1.00
Average temperature for October in San Juan
87.8 °F
Avg rainfall for October in San Juan
5.8 ″

Airports servicing St. Louis

Airports servicing San Juan

San Juan Isla Grande (SIG)

Top 5 airlines flying from Lambert-St Louis to San Juan

The chart below displays the airlines Cheapflights users traveling from St. Louis to San Juan choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
United Airlines
$153 $434 No cancel fee 69%
Frontier
$161 $323 No cancel fee 62%
Delta
$168 $456 No cancel fee N/A
American Airlines
$172 $469 No cancel fee 71%
Southwest
$196 $317 No cancel fee 63%

Hourly flight availability from St. Louis to San Juan

See what time of day planes typically take off from St. Louis towards San Juan.
Morning 6 AM to noon 100% of STL to SJU departures
Early morning Midnight to 6 AM 0% of STL to SJU departures
Afternoon Noon to 6 PM 0% of STL to SJU departures
Evening 6 PM to midnight 0% of STL to SJU departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from St. Louis to San Juan
See how many times per day planes take to the skies headed from St. Louis to San Juan.
Sunday
0 flights
Monday
1 daily flight
Tuesday
1 daily flight
Wednesday
1 daily flight
Thursday
1 daily flight
Friday
1 daily flight
Saturday
2 daily flights
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