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174 € Cheap Flights from St Louis to San Juan

Compare St Louis to San Juan flight deals

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Flight deals from St Louis Airport to San Juan

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to San Juan? If you want to travel next month, return fares start from 174 €. Find the lowest prices on one-way and return tickets right here.
San Juan.174 € per passenger.Departing Tue, 7 Apr, returning Tue, 14 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 7 Apr, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Tue, 14 Apr, arriving in St Louis.Price includes taxes and charges.From 174 €, select.
San Juan.174 € per passenger.Departing Fri, 24 Apr, returning Sat, 2 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 24 Apr, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Sat, 2 May, arriving in St Louis.Price includes taxes and charges.From 174 €, select.
San Juan.190 € per passenger.Departing Wed, 6 May, returning Sat, 9 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 6 May, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Sat, 9 May, arriving in St Louis.Price includes taxes and charges.From 190 €, select.
San Juan.192 € per passenger.Departing Tue, 2 Jun, returning Fri, 5 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 2 Jun, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Fri, 5 Jun, arriving in St Louis.Price includes taxes and charges.From 192 €, select.
San Juan.207 € per passenger.Departing Mon, 30 Mar, returning Thu, 2 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 30 Mar, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Thu, 2 Apr, arriving in St Louis.Price includes taxes and charges.From 207 €, select.
San Juan.259 € per passenger.Departing Fri, 29 May, returning Tue, 2 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 29 May, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Tue, 2 Jun, arriving in St Louis.Price includes taxes and charges.From 259 €, select.
San Juan.290 € per passenger.Departing Fri, 6 Mar, returning Wed, 11 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 6 Mar, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Frontier Airlines, departs from San Juan Luis Munoz Marin on Wed, 11 Mar, arriving in St Louis.Price includes taxes and charges.From 290 €, select.
San Juan.313 € per passenger.Departing Sat, 1 Aug, returning Fri, 7 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Sat, 1 Aug, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Fri, 7 Aug, arriving in St Louis.Price includes taxes and charges.From 313 €, select.
San Juan.330 € per passenger.Departing Thu, 30 Jul, returning Tue, 4 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Thu, 30 Jul, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Tue, 4 Aug, arriving in St Louis.Price includes taxes and charges.From 330 €, select.
San Juan.341 € per passenger.Departing Tue, 17 Nov, returning Wed, 25 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Tue, 17 Nov, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Delta, departs from San Juan Luis Munoz Marin on Wed, 25 Nov, arriving in St Louis.Price includes taxes and charges.From 341 €, select.
San Juan.342 € per passenger.Departing Sun, 5 Jul, returning Thu, 9 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Sun, 5 Jul, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Thu, 9 Jul, arriving in St Louis.Price includes taxes and charges.From 342 €, select.
San Juan.351 € per passenger.Departing Fri, 28 Aug, returning Tue, 1 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Fri, 28 Aug, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Tue, 1 Sep, arriving in St Louis.Price includes taxes and charges.From 351 €, select.
San Juan.357 € per passenger.Departing Sun, 28 Jun, returning Sat, 4 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Sun, 28 Jun, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Sat, 4 Jul, arriving in St Louis.Price includes taxes and charges.From 357 €, select.
San Juan.427 € per passenger.Departing Sat, 2 Jan, returning Fri, 8 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Sat, 2 Jan, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Delta, departs from San Juan Luis Munoz Marin on Fri, 8 Jan, arriving in St Louis.Price includes taxes and charges.From 427 €, select.
San Juan.495 € per passenger.Departing Fri, 27 Nov, returning Tue, 1 Dec.Return flight with United.Outbound indirect flight with United, departs from St Louis on Fri, 27 Nov, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with United, departs from San Juan Luis Munoz Marin on Tue, 1 Dec, arriving in St Louis.Price includes taxes and charges.From 495 €, select.
San Juan.520 € per passenger.Departing Thu, 31 Dec, returning Wed, 6 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 31 Dec, arriving in San Juan Luis Munoz Marin.Inbound indirect flight with Delta, departs from San Juan Luis Munoz Marin on Wed, 6 Jan, arriving in St Louis.Price includes taxes and charges.From 520 €, select.

Find the cheapest month to fly from St Louis to San Juan

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to San Juan flights are currently cheapest in April.
Mar
from 290 €
Apr
from 174 €
May
from 190 €
Jun
from 192 €
Jul
from 342 €
Aug
from 313 €
Sep
Find prices
Oct
Find prices
Nov
from 341 €
Dec
from 614 €
Jan
from 427 €
Feb
Find prices

Direct flights from St Louis to San Juan

Alternative St Louis to San Juan routes

Looking for the cheapest, fastest or easiest route from St Louis to San Juan? You could fly into the following airports instead.

San Juan Isla Grande

1km from central San Juan
Closest
Search flights

San Juan Luis Munoz Marin

11km from central San Juan
Cheapest
from 174 €
Search flights

Roosevelt Roads

55km from central San Juan
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Ponce

70km from central San Juan
from 337 €
Search flights

Vieques

82km from central San Juan
from 740 €
Search flights

Culebra

85km from central San Juan
Search flights

St Louis to San Juan: Flight information

The things to know before you go.
Cheapest flight found174 €
Cheapest month to flyApril
Average flight time4 hrs, 27 mins
Most popular airlineSouthwest Airlines
Average flights per week2

Finding cheap flights from St Louis to San Juan: Frequently asked questions

There are 6 airports in San Juan: San Juan Isla Grande, San Juan Luis Munoz Marin, Roosevelt Roads, Ponce, Vieques, and Culebra.
The best price we found for a return flight from St Louis to San Juan is 174 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 27 minutes is the average flight time from St Louis to San Juan.
Southwest Airlines flies direct from St Louis to San Juan.
As of March 2026, there are 2 flights per week flying from St Louis to San Juan.
The cheapest month to fly from St Louis to San Juan is usually April.
If you're flying from St Louis Airport, the cheapest airport near San Juan is San Juan Luis Munoz Marin – which is 11.3 km away from the centre of San Juan. We've found flights into this airport from 174 €.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to San Juan on Tuesday, 7 April 2026.
Yes – the average flight time is 4 hours and 27 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Juan but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Juan is around 40 days in advance, so don’t leave your flight to the last minute.
In March, the average temperature is usually around 25°C. August is typically the warmest month in San Juan, when it usually averages around 29°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging 23°C. The rainiest month is September.
Currently, Frontier Airlines offers the cheapest flight tickets to San Juan.

Travelling from Lambert-St. Louis International Airport (STL) to San Juan: what you need to know

  • Expect to be travelling for 4 hours 55 minutes. That's the average journey time for a direct flight from Lambert-St. Louis International Airport to San Juan.

  • San Juan is one hour ahead of St Louis, where Lambert-St. Louis International Airport is located. San Juan observes the UTC-4 timezone.

  • Allow plenty of time to catch your STL to San Juan flight. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Heading away during a peak time like public or school holidays? Expect longer lines at security and check-in. For peace of mind, arrive up to four hours before international flights and two hours before domestic departures.

  • Begin your journey at STL and travel straight to Luis Munoz Marin International Airport (SJU). That will be your arrival point when searching for Lambert-St. Louis International Airport to San Juan tickets.

  • Keep your eyes peeled for offers from Southwest Airlines. This airline operates direct flights from Lambert-St. Louis International Airport to San Juan.

  • Consider adding a stopover to potentially find a cheaper plane ticket from STL to San Juan. Just deselect 'Direct flights only' during your search. Take a break (and maybe save some cash) by stopping at one of these airports:

    • Hartsfield-Jackson Atlanta International Airport (ATL)

    • Miami International Airport (MIA)

    • Orlando International Airport (MCO)

  • Located around 16 kilometres from central St Louis, STL can be reached in about 20 minutes by car. The journey on public transport takes roughly 35 minutes.

  • Want an easy start to your holiday? Stay near STL. Whether you have an early flight from Lambert-St. Louis International Airport to San Juan or want to avoid feeling rushed, these hotels are just the thing:

  • Of all flights leaving Lambert-St. Louis International Airport, 78.04% land on schedule at their destination.

  • You'll find STL at 10701 Lambert International Blvd..

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to San Juan

  • The best price we've found for a one-way Lambert-St. Louis International Airport to San Juan flight is 87 €. The cheapest price for a return flight is 174 €. Bear in mind fares can change due to availability at the time of booking.

  • Book four months before you travel. Pricing trends show that this is the ideal window for finding cheap flights from STL to San Juan.

  • Organise your trip for August. That's the best month for landing an incredible deal on Lambert-St. Louis International Airport to San Juan tickets. If you're open to different travel dates, use the 'Whole month' tool to access the cheapest price across each month.

  • You don't need to check back in every day to find out if fares have dropped when you set up a Price Alert. We'll notify you as soon as there's an even bigger deal on cheap flights from STL to San Juan.

  • Tailor your flights with filters. Choose your ideal departure and arrival times, total journey duration and airlines. You can also sort your results by 'Best,' 'Fastest' or 'Cheapest' flights from Lambert-St. Louis International Airport to San Juan.

Airports in San Juan

Luis Munoz Marin International Airport (SJU)

  • Luis Munoz Marin International Airport (SJU) to the centre of San Juan takes about 10 minutes by car. The centre is roughly 8 kilometres away.

  • It takes around 55 minutes when travelling by public transport.

  • If you have a late flight from Lambert-St. Louis International Airport to San Juan, few things beat the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and snoozing soon after at one of these hotels near SJU:

  • Grab a Luis Munoz Marin International Airport rental car and explore San Juan and beyond with your own wheels. Sixt, Ace Rent a Car and U-Save are popular providers you can book with here.

  • To get the best deal, reserve your ride from Luis Munoz Marin International Airport about two weeks in advance of your flight from STL to San Juan.

Fernando Luis Ribas Dominicci Airport (SIG)

  • The centre of San Juan is around 8 kilometres from Fernando Luis Ribas Dominicci Airport (SIG). After your flight from Lambert-St. Louis International Airport to San Juan has hit the runway and you've made your way out of the airport, expect a drive of around 15 minutes.

  • If you choose to travel on public transport, the ride to the centre will take you 1 hour or so.

  • Hang the 'Do not disturb' sign on your door and unwind at a hotel near SIG. Here are a few options where you can tuck yourself in after your STL to San Juan flight:

Best time to go to San Juan

  • Carefully consider your dates before securing your flight from Lambert-St. Louis International Airport to San Juan. The city buzzes during peak season, but hotel prices are typically higher and top attractions can get busy. Visit San Juan in low season if you like a more relaxed vibe.

  • Before booking a Lambert-St. Louis International Airport to San Juan plane ticket, think about the kind of weather forecast you're hoping for. September is the warmest month in San Juan, with temperatures ranging from 23ºC (73ºF) to 33ºC (91ºF).

  • If you like cooler conditions, search for a cheap ticket from STL to San Juan in February when temperatures average between 20ºC (68ºF) and 28ºC (82ºF).

More about San Juan

  • Start your San Juan trip off on the right foot by choosing the ideal place to stay. Once you've booked your flight from Lambert-St. Louis International Airport to San Juan, explore our selection of accommodation options including:

  • There are so many things to see and do in this city it can be hard to know where to start. La Garita del morro de san juan bahia, Castillo San Felipe del Morro and Fortaleza Street are highlights which should be on any well-planned San Juan itinerary.

Explore more of Puerto Rico

  • You've visited San Juan, now it's time to discover more of Puerto Rico. Journey around 113 kilometres west to Aguadilla to tick off its top sights. From El Parterre to Aguadilla Ice Skating Arena and Bandera de los Reyes Magos, you'll have a packed itinerary ahead.

  • Isabela is another standout destination in Puerto Rico and is around 105 kilometres west of San Juan. No journey is complete without a visit to Amarillo Mango, Urb. Llanos Piscina Park and Noches de Artesania.

Plan the rest of your trip from St Louis to San Juan

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.