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Saint Thomas Island

$132+ 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — STT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Saint Thomas Island Cyril E King are usually found in September or October, booked 27 days in advance, depart on a Tuesday or Sunday and return on a Thursday

Cheap 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 December 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:05 pmMIA - STT
1 stop9h 51mMultiple Airlines
Wed 12/3112:31 pmSTT - MIA
2 stops25h 35mMultiple Airlines
Deal found 12/17$497
This KAYAK deal was found by Cheapflights users on 12/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/319:26 pmMIA - STT
2 stops16h 02mSpirit Airlines
Fri 1/93:57 pmSTT - MIA
2 stops20h 59mSpirit Airlines
Deal found 12/16$513
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2711:05 pmMIA - STT
1 stop8h 40mMultiple Airlines
Wed 12/3112:31 pmSTT - MIA
2 stops25h 35mMultiple Airlines
Deal found 12/17$542
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:05 pmMIA - STT
1 stop9h 51mMultiple Airlines
Tue 12/305:28 pmSTT - MIA
1 stop13h 32mMultiple Airlines
Deal found 12/17$562
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/223:38 pmMIA - STT
1 stop21h 00mMultiple Airlines
Wed 12/3112:31 pmSTT - MIA
2 stops25h 35mMultiple Airlines
Deal found 12/17$573
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/223:38 pmMIA - STT
1 stop21h 00mMultiple Airlines
Sun 12/283:34 pmSTT - MIA
1 stop15h 26mMultiple Airlines
Deal found 12/16$581
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:30 amMIA - STT
2 stops29h 01mMultiple Airlines
Mon 12/295:28 pmSTT - MIA
1 stop13h 32mMultiple Airlines
Deal found 12/17$591
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:00 amMIA - STT
2 stops26h 31mMultiple Airlines
Tue 12/305:28 pmSTT - MIA
1 stop13h 32mMultiple Airlines
Deal found 12/17$601
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:30 amMIA - STT
2 stops29h 01mMultiple Airlines
Thu 12/255:28 pmSTT - MIA
1 stop13h 32mMultiple Airlines
Deal found 12/17$602
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/223:38 pmMIA - STT
1 stop21h 00mMultiple Airlines
Mon 12/2912:31 pmSTT - MIA
2 stops37h 16mMultiple Airlines
Deal found 12/17$605
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2711:05 pmMIA - STT
1 stop8h 40mMultiple Airlines
Tue 12/305:28 pmSTT - MIA
1 stop13h 32mMultiple Airlines
Deal found 12/17$607
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:05 amMIA - STT
1 stop6h 43mMultiple Airlines
Wed 12/3112:31 pmSTT - MIA
2 stops13h 16mMultiple Airlines
Deal found 12/17$613

Find 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 December 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$355
(Mytrip)

One-way from

$132
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$587
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. 10% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Thu 2/19

7:05 am-2:31 pm

3 stops30h 26m

Saint Thomas Island Cyril E King

Tue 2/24

5:40 pm-8:51 pm

2 stops28h 11m

$371

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Thu 1/1

9:59 pm-11:31 am

2 stops12h 32m

Saint Thomas Island Cyril E King

Thu 1/8

5:42 pm-9:10 am

2 stops16h 28m

$417

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Wed 5/13

8:30 am-11:10 am

Nonstop2h 40m

Saint Thomas Island Cyril E King

Wed 5/20

5:10 pm-8:20 pm

Nonstop3h 10m

$490

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Sat 1/17

6:25 pm-1:56 pm

1 stop18h 31m

Saint Thomas Island Cyril E King

Wed 1/21

5:25 pm-4:22 pm

2 stops23h 57m

$493

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Tue 3/10

6:55 am-2:20 pm

1 stop7h 25m

Saint Thomas Island Cyril E King

Tue 3/17

1:50 pm-10:15 pm

1 stop8h 25m

$499

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Sat 5/9

7:35 am-1:31 pm

3 stops29h 56m

Saint Thomas Island Cyril E King

Sun 5/10

4:40 pm-12:57 pm

2 stops20h 17m

$524

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Mon 2/16

6:50 am-2:55 pm

1 stop7h 05m

Saint Thomas Island Cyril E King

Thu 2/19

3:55 pm-9:55 pm

1 stop7h 00m

$529

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Sat 5/2

4:46 pm-12:20 pm

2 stops19h 34m

Saint Thomas Island Cyril E King

Wed 5/6

1:22 pm-4:15 pm

2 stops26h 53m

$553

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Fri 1/30

7:09 pm-4:37 pm

2 stops20h 28m

$154

MiamiSaint Thomas Island

MIA - STT

MIASTT

Miami

Mon 1/5

10:19 pm-11:31 am

2 stops36h 12m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 19 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 December 12, 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 27 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, January is the cheapest month in which you can book a flight from Key Largo to Saint Thomas Island (average of $50). Flying from Key Largo to Saint Thomas Island in December is currently the most expensive (average of $196). 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 December 18, 2025.

A simple way to save on the total cost of your ticket is to fly from Key Largo to Saint Thomas Island in the evening. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight in the afternoon.

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 afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 18, 2025.
Read through reviews of airlines operating flights from Key Largo to Saint Thomas Island, such as American Airlines, Spirit Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,054 reviews

Crew

8.0

Food

6.5

Overall

7.2

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
American Airlines
7.2
Good
11,054 reviews
American Airlines
7.2
Good
11,054 reviews

Crew

8.0

Food

6.5

Overall

7.2

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
Spirit Airlines
6.3
Okay
8,189 reviews
American Airlines
7.2
Good
11,054 reviews

Crew

8.0

Food

6.5

Overall

7.2

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
Frontier
5.8
Fair
3,080 reviews
American Airlines
7.2
Good
11,054 reviews

Crew

8.0

Food

6.5

Overall

7.2

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.

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 1 inbound flight 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.

  • How long is the flight from Key Largo to Saint Thomas Island?

    A quick flight from Key Largo to Saint Thomas Island can take about 2h 40m. Spirit Airlines provides one of the quickest options available for as low as $490. Airlines will cover a distance of 1106 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $45. 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 (78%), American Airlines (77%) and Qatar Airways (68%).

  • 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 $429, our data indicates the cheapest price to be $208. The most popular route (Miami - Saint Thomas Island Cyril E King), is priced around $333.

  • 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, January is the cheapest month in which you can book a flight from Key Largo to Saint Thomas Island (average of $50). Flying from Key Largo to Saint Thomas Island in December is currently the most expensive (average of $196). 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 Saint Thomas Island?

Book flights to Saint Thomas Island if you plan to visit one of these locations
St. John

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Alternative routes for Key Largo to Saint Thomas Island

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$192FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$100Average$238FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$197Average$480FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$273Average$482FlexibilityNo cancel feeOn-time71%

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