$90 Find Cheap Flights from St. Louis to Puerto Rico

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Puerto Rico departing on 8/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Book Cheap St. Louis to Puerto Rico Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Puerto Rico that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Puerto Rico

Tue, Aug 18 - Sun, Aug 23
American Airlines Logo
8:34 am - 9:55 pm
STL
-
SJU
12h 21m
2 stops
American Airlines Logo
7:24 pm - 10:45 am
SJU
-
STL
16h 21m
1 stop
$252American Airlines
Wed, Sep 2 - Wed, Sep 9
American Airlines Logo
8:34 am - 11:59 pm
STL
-
SJU
14h 25m
1 stop
American Airlines Logo
2:58 pm - 10:42 pm
SJU
-
STL
8h 44m
2 stops
$257American Airlines
Wed, Sep 2 - Thu, Sep 10
Delta Logo
11:00 am - 10:29 pm
STL
-
SJU
10h 29m
1 stop
Delta Logo
7:30 am - 2:38 pm
SJU
-
STL
8h 08m
1 stop
$316Delta
Fri, Sep 18 - Wed, Sep 23
American Airlines Logo
5:13 pm - 9:24 am
STL
-
SJU
15h 11m
2 stops
American Airlines Logo
11:51 am - 12:27 am
SJU
-
STL
13h 36m
2 stops
$324American Airlines
Mon, Sep 7 - Thu, Sep 10
Delta Logo
7:00 am - 4:38 pm
STL
-
SJU
8h 38m
1 stop
Delta Logo
7:30 am - 2:38 pm
SJU
-
STL
8h 08m
1 stop
$326Delta
Tue, Sep 1 - Tue, Sep 8
American Airlines Logo
10:44 am - 9:55 pm
STL
-
SJU
10h 11m
2 stops
American Airlines Logo
7:00 am - 5:01 pm
SJU
-
STL
11h 01m
1 stop
$328American Airlines
Wed, Sep 2 - Wed, Sep 9
American Airlines Logo
6:00 am - 6:34 pm
STL
-
SJU
11h 34m
2 stops
American Airlines Logo
2:58 pm - 10:42 pm
SJU
-
STL
8h 44m
2 stops
$329American Airlines
Mon, Aug 10 - Fri, Aug 14
American Airlines Logo
5:42 am - 2:54 pm
STL
-
SJU
8h 12m
1 stop
American Airlines Logo
3:28 pm - 10:40 pm
SJU
-
STL
8h 12m
1 stop
$330American Airlines
Mon, Nov 9 - Sat, Nov 14
American Airlines Logo
6:00 am - 11:47 pm
STL
-
SJU
15h 47m
1 stop
American Airlines Logo
8:00 am - 4:18 pm
SJU
-
STL
10h 18m
2 stops
$332American Airlines
Fri, Sep 18 - Sun, Sep 20
Southwest Logo
2:25 pm - 10:15 pm
STL
-
SJU
6h 50m
1 stop
Southwest Logo
5:55 pm - 11:25 pm
SJU
-
STL
6h 30m
1 stop
$336Southwest
Booking Insights

KAYAK's insights & trends for St. Louis to Puerto Rico flights

Get data-powered insights and trends into flights from St. Louis to Puerto Rico to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest St. Louis to Puerto Rico flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Puerto Rico from St. Louis found in the last 5 days was to San Juan, at $536 round-trip. The most popular route is from St. Louis (STL) to San Juan Luis Munoz Marin Intl Airport (SJU), and the cheapest round-trip airline ticket found on this route in the last 5 days was $536.

What is the cheapest time of day to fly to Puerto Rico?

The average price for all round-trip flights from St. Louis to Puerto Rico depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Puerto Rico is generally in the morning, when round-trip flights cost $616 on average. The most expensive time of day to fly to Puerto Rico is generally in the morning, which is peak travel time and where the average cost of a ticket is $616.

What is the cheapest month to fly from St. Louis to Puerto Rico?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Puerto Rico, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Puerto Rico is July, when tickets cost $104 (return) on average. On the other hand, the most expensive months are August and September, when the average cost of round-trip tickets is $219 and $205 respectively.

How far in advance should I book a flight from St. Louis to Puerto Rico?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Puerto Rico, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Puerto Rico, you should book around 3 weeks before departure, which saves you about 18% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$90
Best time to beat the crowds with an average 40% drop in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from St. Louis to San Juan

FAQs - booking Puerto Rico flights

  • From St. Louis, can I fly to the South Coast of Puerto Rico?

    Yes. You can book a flight through KAYAK from STL to the city Ponce, which is located on the southern coast of Puerto Rico. You will be landing at the Mercedita International Airport (PSE). Spirit is one carrier that offers a flight from STL to PSE with one stop, usually in Orlando. Airlines such as Spirit, Cape Air, and JetBlue offer flights from STL to PSE with two stops. Layover cities often include Orlando, Baltimore, Nashville, and other cities.

  • Where can I go in Puerto Rico for a remote tropical vacation?

    You can fly from St. Louis to the Isla Day Culebra, a small island that is part of Puerto Rico but located to the east of the main island. When you fly to this small island, you will be landing at the Aeropuerto Benjamín Rivera Noriega (CPX). Frontier, Spirit, Cape Air, Silver Airways, and United are among the airlines that offer two- or three-stop flights from STL to CPX. Layover destinations include Washington DC, Dallas, Orlando, and others.

  • What is the San Juan Airport like?

    The San Juan Airport on the northern coast of Puerto Rico is the busiest airport in the Caribbean. This four-terminal airport includes a hotel at the airport, exclusive lounges you can access by paying at the door, shops and restaurants that usually close at night, a currency exchange, public transportation, rental cars, and more.

  • Does STL have private facilities for nursing mothers?

    Yes. STL offers lactation suites throughout the airport at Gates A10, C9, and E33. Each lactation suite is a clean, calm, quiet space where a nursing mom can breastfeed in private or where she can go to pump. Each suite features comfortable seating, a table, an ottoman, a bench, a sink, and an electrical outlet.

  • How does KAYAK find such low prices on flights from St. Louis to Puerto Rico?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Puerto Rico.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Puerto Rico?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Puerto Rico is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Puerto Rico?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to Puerto Rico with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Puerto Rico?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to Puerto Rico up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Puerto Rico

  • The St. Louis Lambert International Airport (STL) is a hub for Air Choice One and Cape Air. When you book your flight through KAYAK for St. Louis to Puerto Rico, you will have many options of destination, airline, flight time, and price.
  • When you fly from STL to San Juan, the capital of Puerto Rico, you'll be landing on the northeast of the island at the Luis Muñoz Marín International Airport (SJU). Airlines such as Spirit, Frontier, Delta, and United are among the carriers that offer one-stop flights from STL to SJU. Common layover cities include Atlanta, Orlando, and Charlotte. United and American are among the airlines that offer flights from STL to SJU with two stops.
  • If you're flying from STL to Aguadilla, the beach town in the northwest of Puerto Rico, you'll be landing at Rafael Hernández Marín International Airport (BQN). Frontier and Spirit are among the airlines that offer one- and two-stop flights from STL to BQN, with layovers in cities such as Orlando, Tampa, Las Vegas, and Fort Lauderdale.
  • As you wait for your flight to Puerto Rico at the St. Louis International Airport, you can enjoy the live music of a piano player in the terminal. STL decided to have the piano player as part of an arts and culture initiative at the airport, a program designed to delight travelers and enhance their experience.
  • The St. Louis Airport has two interfaith chapels that welcome all. These quiet spaces are meant for reflection, meditation, prayer, or simply for relaxation. These chapels are open 24/7. One chapel is located on the lower level of Terminal 1 and the other is near Gate E40.

Reviews of the top 5 airlines serving from St. Louis to Puerto Rico

 
Need help choosing which airline to fly with from St. Louis to Puerto Rico? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4255 reviews
7.5Entertainment
8.1Boarding
8.6Crew
7.0Food
8.0Comfort
Airline reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

2.0 MediocreDawn, Jun 2026
BUF - BWI
Read more Southwest reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

I don't know why flying out of Sarasota requires two plane changes.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

I'm glad it wasn't only 75% full because I could get a good seat

if I was good. Not happy that I have to pay extra money to get the seat I need for lake room, but I guess that’s a sign of the times.

Left /arrived on time. Decent seat space. Like the wifi/plugs and entertainment. Windows and tray table were kinda gross. Attendants didn't start snack service til 40mins before landing. Two rows before us, captain came on to say there's turbulence and recalled staff to seats. So, no drink/snack. Later, attendants didn't stop to see if we had trash nor even look our way. Felt invisible! Almost all pilot announcements were not only unintelligible, but so quiet. We had no idea what she said.

Average seat comfort, a drink and chips were provided, early boarding because we checked a carryon at the gate was nice. Ticket pricing shenanigans, including fees to pick a seat, check a bag, and get food onboard - evidence the industry is reinvigorating last century’s strategies- destroys the experience before one ever arrives at the airport. It’s difficult to recognize any value or sustain loyalty in the end-to-end process making air travel more drudgery than pleasure.

Gate agent was unhelpful for handicapped boarding. Flight attendant seemed untrained.

No service flight that took 5 hrs and a stop at an unscheduled airport. Crew and pilots did their jobs

Clean planes and not take my comfort class seat away.

The crew were efficient. The pilots seemed professional. It was a bit chilly in our seats. The sheet provided weren’t very helpful.

Weather caused a long delay, but the efficiency and updates from the pilot were helpful. We were able to make our connection fortunately.

Planes were clean, no water or snacks on either flight.

Free & relatively fast Wi-Fi. Would've liked a wider drink selection.

I continue to be satisfied with Delta’s excellent service out of LGA. The digit id works well and gets me through security in no time. Whenever possible, I choose Delta.

I flew from Santa Fe to Denver to catch a flight to London and the transfer of my luggage on arrival at Denver to the London flight worked perfectly. The crew on the ground and on board for the London flight were so friendly and efficient.

Boarded early; and arrived home 40 mins early. After a long flight, it’s nice to be back home early. These flights have no amenities; no snacks. So need to bring your own

Boarded early, left early, arrived 40 mins early! A win win for me!

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

It was a short flight so I was expecting too much

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

I felt scammed. The priced advertised was different than what I paid. I paid the whole some online. I then got a call 20 minutes later saying I need to paid 70 more person. She said the price online is not the guaranteed price.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

My pillow had a shoe print on it, when I asked if I can have another pillow, I was told “I’m sorry but it is one pillow per guest, do YOU want to turn it inside out” to which I responded , no thanks I will go without. This is generally not ok, but For the price tag I paid flying business this is absolutely unacceptable. Hopefully American Airlines can update their accommodations to bedding that is not tossed on the ground and stepped on, or at least have a couple of extra pillows in hand, incase someone had decided to step on the pillows for what ever reason

The flight from LA to Chicago was smooth and service was very good overall.

The flight from Dallas to Tokyo was not on Japan Airlines. It was on American Airlines. Very disappointed that we did not fly on Japan Airlines. Will not be using you liars again. I’ll just book direct from the airline next time. Wish you could make this right and has us fly on Japan Air when heading back home to the US.

The Mario was so helpful and provided amazing customer service however l have being waiting for a callback for almost a week now and have not heard anything further after l informed them l wanted to change my date of traveling because of my hospital appointment even send them proof and l was unable to use manag your booking on their website is a bit frustrating and l would appreciate an update on My request as soon as possible. And have called them times without numbers no response

They made nearly everyone check their bag because the overhead bins are way too small. Extremely inconvenient

Delayed delayed. Poor professionalism. Our seats changed and we pay for them

Was put into a seat right behind the toilet that had no entertainment possible but did have plenty of leg room over noisy part of plane.

B-class on an old plane with antiquated amenities and poor service. Landed in Rome w/o bag that didn’t make the connection (plenty of time in London). Bag will come to hotel NOT the day it lands but the following night!! Still waiting for bag…BA had nothing to offer in support and couldn’t even tell me their comp, told to submit receipts and then I’ll learn what is or isn’t covered.

Movies on my phone are great. It would be nice to have a gluten free snack option.

It was what i expected. I like the movies you can access from your phone. It would be nice if there was a gluten free snack offered. But I did bring my own snack knowing there would not be a gluten free option

There weren't enough employees at check in took awhile to get bags checked. There wasn't a wheel chair for me, I was sent to someone who turns out to work for a different airline, if My flight hadn't been delayed I probably would have missed my flight as it was, by the time I arrived at my gate, they started boarding in about 15 minutes. I don't know who took me to my gate, definitely was not the normal people who take passengers to the gate. I'm guessing she may have been in a management position. I wish I knew her name, she went beyond to help me. With that said everyone was kind, and were doing the best they could. So, I choose to say it was an Adventure, stressful start, but good. In the end went well. The situation was not only difficult for passengers but the employee's.

The staff at the check in counter was so rude. Made you feel Incompetent

Frontier scheduled a 40 minute connection in DEN. What they failed to mention was that they “close the doors” 20 mins prior to departure, which means you only have 20 mins. Not enough time. Possibly against DOT regulations. Filing complaint.

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

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

Information on your arrival and departure airports