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

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The best prices from St Louis to San Juan are usually found in August or October, booked 16 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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
82.4 - 89.6 °F
PR1
Precipitation
1.3 - 5.8 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 St Louis to San Juan

One-way from

$185

One-way flight from 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.
What is the cheapest day to fly round-trip from St Louis to San Juan?

It’s generally more expensive to depart on a Monday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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 19 days in advance to save up to 7% 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 19 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 $262, or $281 for flights within the next 24 hours.

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

August can be a great time to fly to San Juan from St Louis with a flight ticket averaging about $313. Cheapflights users have found deals in the month of August for as cheap as $121. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from St Louis to San Juan (STL - PR1)?

One of the essential ways to save on airfare from St Louis to San Juan is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 15% on airfare.

Cheap flights from St Louis to San Juan in July, August 2021

The best prices found for STL to SJU flights for July, August
17 Aug - 21 Aug
$108pp
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
20 Aug - 25 Aug
$110pp
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
17 Aug - 24 Aug
$124pp
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

St Louis to San Juan 2021 flight deals

Cheap flights to San Juan from St Louis found for this year
17 Aug - 21 Aug
$108pp
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
20 Aug - 25 Aug
$110pp
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
17 Aug - 24 Aug
$124pp
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

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
4 Aug - 11 Aug
$210pp
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
4 Aug - 9 Aug
$246pp
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
4 Aug - 11 Aug
$247pp
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

One-way flights to San Juan from St Louis

The cheapest one-way flights from St Louis to San Juan
2:40 am - 4:11 pm
United Airlines
2 Stops
12h 31m
STL - SJU
United Airlines
$185
United
1:24 am - 7:52 pm
American Airlines
2 Stops
17h 28m
STL - SJU
American Airlines
3:00 am - 2:10 pm
Spirit Airlines
3 Stops
34h 10m
STL - SJU
Spirit Airlines
$197
Gotogate

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

Are flight prices decreasing from St Louis to San Juan due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both St Louis and San Juan for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

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.

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.

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 $108, but on average you can expect to pay $142.

Are there nonstop flights from St Louis to San Juan for under $100 on Cheapflights?

There are no nonstop flights from St Louis to San Juan, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Are there last-minute flights available from St Louis to San Juan for under $300?

There are currently 20+ open flights from St Louis to San Juan within the next 7 days for less than $300.

Is St Louis weather warmer or cooler than San Juan?

Temperatures around the 90 °F's can be experienced in June. The weather in San Juan is hotter than in St Louis. Plan for potential changes in flight availability as peak weather approaches in this location.

How long is the flight from St Louis to San Juan?

Airlines like Spirit Airlines fly from St Louis to San Juan in about 10h 57m. The time it takes to get you to your destination can typically vary by up to .

What is the cheapest airline to fly from St Louis to San Juan round-trip?

Cheapflights users have booked flights from St Louis to San Juan round-trip from $108. Users have found that Spirit Airlines is 72% cheaper than the other options available to this destination.

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

$71 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $176 and $184, respectively.

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.

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 July in San Juan
89.6 °F
Avg rainfall for July in San Juan
4.7 ″

Airports servicing St. Louis

Airports servicing San Juan

San Juan Isla Grande (SIG)

Top 5 airlines flying from 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
Southwest
$196 $317 No cancel fee 63%
Frontier
$161 $323 No cancel fee 62%
United Airlines
$153 $434 No cancel fee 69%
Delta
$168 $456 No cancel fee N/A
American Airlines
$172 $469 No cancel fee 71%

Hourly flight availability from St Louis to San Juan

See what time of day planes typically take off from St Louis towards San Juan.
Early morning Midnight to 6 AM 100% of STL to SJU departures
Morning 6 AM to noon 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
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