HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Saint Thomas Island

$85+ Cheap flights from Key Largo, FL to Saint Thomas Island (STT)

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — STT
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Saint Thomas Island with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Key Largo to Saint Thomas Island Cyril E King are usually found in October or September, booked 35 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Key Largo to Saint Thomas Island

Keep the following information in mind while searching for Key Largo to Saint Thomas Island flight deals. Data was last updated April 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$196
(Frontier)

One-way from

$85
(Cheapflightsfares)

Popular in

December

Cheapest in

October

Average price

$413
Provider with most accurate pricing for Miami-Saint Thomas Island Cyril E King flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Saint Thomas Island Cyril E King flights.
Search Deals
From Key Largo to Saint Thomas Island Cyril E King
Search Deals
One-way flight from Key Largo to Saint Thomas Island Cyril E King
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Key Largo to Saint Thomas Island

Cheapest flights from Key Largo to Saint Thomas Island
Explore the most affordable flight options available from Key Largo to Saint Thomas Island. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/197:15 amMIA - STT
1 stop4h 57mFrontier
Fri 5/301:00 pmSTT - MIA
1 stop11h 26mFrontier
Deal found 4/29$196
This Trip.com deal was found by Cheapflights users on 4/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/78:15 amMIA - STT
1 stop9h 15mMultiple Airlines
Fri 5/91:12 pmSTT - MIA
1 stop11h 14mMultiple Airlines
Deal found 4/27$218
This American Airlines deal was found by Cheapflights users on 4/28. 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 5/191:40 pmMIA - STT
Nonstop2h 40mAmerican Airlines
Wed 5/215:10 pmSTT - MIA
Nonstop3h 05mAmerican Airlines
Deal found 4/28$250
This Delta deal was found by Cheapflights users on 4/28. 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.
Tue 7/88:02 amMIA - STT
1 stop6h 58mDelta
Tue 7/151:27 pmSTT - MIA
1 stop7h 51mDelta
Deal found 4/28$275
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Thu 5/221:35 pmMIA - STT
2 stops22h 51mSpirit Airlines
Wed 5/282:41 pmSTT - MIA
2 stops29h 31mSpirit Airlines
Deal found 4/28$342
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 8/17:00 amMIA - STT
1 stop8h 43mUnited Airlines
Tue 8/51:19 pmSTT - MIA
1 stop9h 20mUnited Airlines
Deal found 4/28$419

Cheapflights Fare Finder

Customize your flight search to find flights from Key Largo to Saint Thomas Island 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 April 29, 2025.
Use the filters below to find and compare flights from Key Largo to Saint Thomas Island that are best for you.

Fly from

Key Largo

Fly to

Saint Thomas Island

Route

Depart

Return

Price

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Mon 5/19

7:15 am-12:12 pm

1 stop4h 57m

Saint Thomas Island Cyril E King

Fri 5/30

1:00 pm-12:26 am

1 stop11h 26m

$196

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Tue 5/20

8:15 am-5:30 pm

1 stop9h 15m

Saint Thomas Island Cyril E King

Thu 5/29

9:10 am-12:26 am

1 stop15h 16m

$243

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Mon 5/19

1:40 pm-4:20 pm

Nonstop2h 40m

Saint Thomas Island Cyril E King

Wed 5/21

5:10 pm-8:15 pm

Nonstop3h 05m

$250

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Tue 7/8

8:02 am-3:00 pm

1 stop6h 58m

Saint Thomas Island Cyril E King

Tue 7/15

1:27 pm-9:18 pm

1 stop7h 51m

$275

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Thu 5/22

1:35 pm-12:26 pm

2 stops22h 51m

Saint Thomas Island Cyril E King

Wed 5/28

2:41 pm-8:12 pm

2 stops29h 31m

$342

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Fri 8/1

7:00 am-3:43 pm

1 stop8h 43m

Saint Thomas Island Cyril E King

Tue 8/5

1:19 pm-10:39 pm

1 stop9h 20m

$419

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Fri 5/9

7:15 am-12:12 pm

1 stop4h 57m

$85

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Wed 5/28

2:29 pm-9:57 am

2 stops19h 28m

$158

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Tue 5/27

1:40 pm-4:20 pm

Nonstop2h 40m

$263

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Tue 6/10

7:00 am-1:49 pm

1 stop6h 49m

$268

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 12 results
1
2

Best time to book a flight from Key Largo to Saint Thomas Island

Have a flexible travel schedule? Discover the best time to fly to Saint Thomas Island from Key Largo 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.

Cheapflights Insights

Everything you need to know about your flight from Key Largo to Saint Thomas Island

How far ahead should I book a flight from Key Largo to Saint Thomas Island?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Saint Thomas Island. Price data was last updated on April 25, 2025.

To ensure you get the cheapest price possible for a flight from Key Largo to Saint Thomas Island, you should look to book at least 35 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Key Largo to Saint Thomas Island?

Currently, September is the cheapest month in which you can book a flight from Key Largo to Saint Thomas Island (average of $432). Flying from Key Largo to Saint Thomas Island in June is currently the most expensive (average of $627). 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 KE9 to STT?

Find hourly flight availability from Key Largo to Saint Thomas Island. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 29, 2025.

When flying from Key Largo to Saint Thomas Island, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to Saint Thomas Island?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Saint Thomas Island. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Key Largo to Saint Thomas Island flight should consider departing on Tuesday at noon when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to Saint Thomas Island

Explore weekly flight availability from Key Largo to Saint Thomas Island. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 29, 2025.

The most flights from KE9 to STT are scheduled on a Tuesday (6 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing Saint Thomas Island

Get insights into the airlines that provide service to Saint Thomas Island. 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 Saint Thomas Island. Reviews last updated April 29, 2025.
Read reviews from past customers who have flown Delta, United Airlines and American Airlines from Key Largo to Saint Thomas Island. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Spirit Airlines
6.3
Okay
7,956 reviews
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Frontier
6.0
Okay
3,284 reviews
Delta
8.0
Very good
7,929 reviews

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Saint Thomas Island. 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 into for flights to Saint Thomas Island from Key Largo?

    Saint Thomas Island Cyril E King (STT) is the airport you will fly into if you book a flight from Key Largo to Saint Thomas Island. You should not have trouble finding flights to Cyril E King from Key Largo; the airport handles an average of 3 inbound flights from Key Largo per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the Saint Thomas Island airport from Key Largo. It is only a 2.8 mi journey from Cyril E King (STT) to Saint Thomas Island’s city center.

  • What are the cheapest airlines to fly from Key Largo to Saint Thomas Island one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $85. However, be on the lookout for offers from Spirit Airlines and American Airlines, as they are both options that can get you from Key Largo to Saint Thomas Island for a low price.

  • What are the most reliable airlines from Key Largo to Saint Thomas Island?

    The top 3 most reliable airlines when flying from Key Largo to Saint Thomas Island are British Airways (95%), American Airlines (82%) and Qatar Airways (57%).

  • What are the cheapest flights from Key Largo to Saint Thomas Island?

    Looking for the cheapest flight from Key Largo to Saint Thomas Island? While on average our users pay $341, our data indicates the cheapest price to be $203. The most popular route (Miami - Saint Thomas Island Cyril E King), is priced around $219.

  • Can I find deals for flights from Key Largo to Saint Thomas Island that include hotel bookings?

    Yes. In addition to deals on Key Largo to Saint Thomas Island flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Key Largo to Saint Thomas Island?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Saint Thomas Island.

  • Can I find deals for business class flights from Key Largo to Saint Thomas Island?

    Yes. Cheapflights offers flight deals from Key Largo to Saint Thomas Island 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 Key Largo to Saint Thomas Island?

    Currently, September is the cheapest month in which you can book a flight from Key Largo to Saint Thomas Island (average of $432). Flying from Key Largo to Saint Thomas Island in June is currently the most expensive (average of $627). 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.

See more FAQs

Traveling to a place near Key Largo?

Book flights to Key Largo if you plan to visit one of these locations
St. John

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Saint Thomas Island

See prices for flight routes from nearby airports that may be better suited for you.
Orlando to Saint Thomas Island flights
Miami to Saint Thomas Island flights
Fort Lauderdale to Saint Thomas Island flights
Tampa to Saint Thomas Island flights
Jacksonville to Saint Thomas Island flights
Orlando to Christiansted flights
Miami to Christiansted flights
Tampa to Christiansted flights
Fort Lauderdale to Christiansted flights
Pensacola to Christiansted flights
West Palm Beach to Saint Thomas Island flights
Pensacola to Saint Thomas Island flights
Fort Myers to Saint Thomas Island flights
Jacksonville to Christiansted flights
Tallahassee to Saint Thomas Island flights
Melbourne to Saint Thomas Island flights
Sarasota to Saint Thomas Island flights
Gainesville to Saint Thomas Island flights
Daytona Beach to Saint Thomas Island flights
Fort Myers to Christiansted flights
Valparaiso to Christiansted flights
Daytona Beach to Christiansted flights
Melbourne to Christiansted flights
Panama City to Christiansted flights
Panama City to Saint Thomas Island flights
Valparaiso to Saint Thomas Island flights

Top 4 airlines flying from Key Largo to Saint Thomas Island

Discover the top 4 airlines that operate flights from Key Largo to Saint Thomas Island. 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$159FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$110Average$223FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$148Average$473FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$195Average$416FlexibilityNo cancel feeOn-time62%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.