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Key Largo

$56+ Cheap flights from Boston (BOS) to Key Largo, FL

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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — MIA
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Key Largo are usually found in September or January, booked 46 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from Boston to Key Largo

Keep the following information in mind while searching for Boston to Key Largo flight deals. Data was last updated septiembre 16, 2025.

Round-trip from

$97
(Cheapflightsfares)

One-way from

$56
(Cheapflightsfares)

Popular in

April

Cheapest in

September

Average price

$190
From Boston Logan Intl to Key Largo
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One-way flight from Boston Logan Intl to Key Largo
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Highest demand for flights based on searches. 1% potential increase in price ($3 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Boston to Key Largo

Cheapest flights from Boston to Key Largo
Explore the most affordable flight options available from Boston to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/174:54 pmBOS - MIA
Nonstop3h 38mSpirit Airlines
lun. 10/2012:40 pmMIA - BOS
Nonstop3h 16mSpirit Airlines
Deal found 9/14$97
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/22:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
lun. 10/612:40 pmMIA - BOS
Nonstop3h 16mSpirit Airlines
Deal found 9/14$99
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/134:54 pmBOS - MIA
Nonstop3h 38mSpirit Airlines
lun. 10/2012:40 pmMIA - BOS
Nonstop3h 16mSpirit Airlines
Deal found 9/15$102
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/272:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
sáb. 10/49:56 amMIA - BOS
Nonstop3h 27mSpirit Airlines
Deal found 9/15$106
This Trip.com deal was found by Cheapflights users on 9/15. 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.
jue. 10/22:18 pmBOS - MIA
Nonstop3h 32mMultiple Airlines
vie. 10/36:59 pmMIA - BOS
1 stop12h 44mMultiple Airlines
Deal found 9/15$108
This Orbitz deal was found by Cheapflights users on 9/14. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/1611:44 amBOS - MIA
Nonstop3h 36mMultiple Airlines
lun. 10/2012:40 pmMIA - BOS
Nonstop3h 16mMultiple Airlines
Deal found 9/14$110
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/22:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
vie. 10/310:35 amMIA - BOS
1 stop7h 27mSpirit Airlines
Deal found 9/16$112
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/42:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
sáb. 10/114:58 pmMIA - BOS
1 stop5h 54mSpirit Airlines
Deal found 9/16$117
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/1611:44 amBOS - MIA
Nonstop3h 36mFrontier
jue. 10/237:24 amMIA - BOS
Nonstop3h 25mFrontier
Deal found 9/15$118

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Key Largo 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 septiembre 16, 2025.
Use the filters below to find and compare flights from Boston to Key Largo that are best for you.

Fly from

Boston

Fly to

Key Largo

Route

Depart

Return

Price

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

jue. 10/23

4:26 pm-8:00 pm

Nonstop3h 34m

Miami

sáb. 10/25

12:15 pm-3:37 pm

Nonstop3h 22m

$137

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

vie. 11/14

7:55 pm-11:32 pm

Nonstop3h 37m

Miami

mié. 11/19

4:52 pm-1:22 am

1 stop8h 30m

$147

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

jue. 10/2

3:24 pm-6:59 pm

Nonstop3h 35m

Miami

mié. 10/8

12:05 pm-3:26 pm

Nonstop3h 21m

$147

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

vie. 10/3

7:10 am-10:43 am

Nonstop3h 33m

Miami

lun. 10/6

7:35 pm-11:00 pm

Nonstop3h 25m

$147

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

jue. 10/2

3:24 pm-6:59 pm

Nonstop3h 35m

Miami

lun. 10/6

7:35 pm-11:00 pm

Nonstop3h 25m

$147

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

vie. 10/3

7:10 am-10:43 am

Nonstop3h 33m

Miami

mar. 10/7

7:35 pm-11:00 pm

Nonstop3h 25m

$147

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

jue. 10/2

3:45 pm-10:50 pm

1 stop7h 05m

Miami

lun. 10/6

7:05 pm-11:55 pm

1 stop4h 50m

$151

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

mié. 10/8

5:34 am-11:25 am

1 stop5h 51m

Miami

mié. 10/15

5:25 pm-11:49 pm

1 stop6h 24m

$157

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

lun. 9/29

6:00 am-2:17 pm

1 stop8h 17m

Miami

vie. 10/3

4:56 pm-10:57 pm

1 stop6h 01m

$167

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

mié. 11/5

7:35 am-11:10 am

Nonstop3h 35m

Miami

dom. 11/9

7:00 am-10:20 am

Nonstop3h 20m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
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Best time to book a flight from Boston to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Boston 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 Boston to Key Largo

How far ahead should I book a flight from Boston to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Key Largo. Price data was last updated on September 12, 2025.

The price you pay for your flight from Boston to Key Largo may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to Key Largo?

Currently, September is the cheapest month in which you can book a flight from Boston to Key Largo (average of $232). Flying from Boston to Key Largo in March is currently the most expensive (average of $289). 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 BOS to KE9?

Find hourly flight availability from Boston to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 16, 2025.

When flying from Boston to Key Largo, 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 Boston to Key Largo?

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

Travelers seeking maximum savings on their Boston to Key Largo flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Boston to Key Largo

Explore weekly flight availability from Boston to Key Largo. 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 septiembre 16, 2025.

The most flights from BOS to KE9 are scheduled on a Friday (22 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (14 on average).

How much does it cost to fly round-trip from Boston to Key Largo?

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated septiembre 16, 2025.
Get a feel of what it's like to fly with Delta, American Airlines, and JetBlue from Boston to Key Largo by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
8.0
Very good
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
JetBlue
7.2
Good
2,914 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Spirit Airlines
6.3
Okay
8,019 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.8
Fair
3,174 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Related info for your journey

Find useful and relevant information for your journey from Boston to Key Largo. 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 from for flights from Boston to Key Largo?

    If you book a flight to Key Largo from Boston, you will be flying from Logan Intl, which is the city’s only airport. Boston Logan Intl (BOS) is located 2.6 mi from the center of Boston. There are 18 flights from Logan Intl to Key Largo per day from 8 different airlines.

  • How popular is this Boston to Key Largo flight route?

    The Boston Logan Intl to Key Largo flight path was viewed by 153 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Boston to Key Largo?

    Departing from Boston to Key Largo will take you 3h 34m. There are 1259 mi between Boston and Key Largo. All flights are typically nonstop.

  • What are the most reliable airlines from Boston to Key Largo?

    Before booking your flight to Key Largo from Boston, check out the most reliable airlines to get you to your destination on time: Japan Airlines (98%), Etihad Airways (87%), American Airlines( 83%).

  • What are the cheapest flights from Boston to Key Largo?

    The cheapest flight price from Boston to Key Largo is $59. On average you can expect to pay $542. The most popular route, (Boston Logan Intl - Miami), can usually be booked for $81.

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

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

  • How can I find direct flights from Boston to Key Largo?

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

  • Can I find deals for business class flights from Boston to Key Largo?

    Yes. Cheapflights offers flight deals from Boston to Key Largo 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 Boston to Key Largo?

    Currently, September is the cheapest month in which you can book a flight from Boston to Key Largo (average of $232). Flying from Boston to Key Largo in March is currently the most expensive (average of $289). 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

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Top 8 airlines flying from Boston to Key Largo

Discover the top 8 airlines that operate flights from Boston to Key Largo. 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 septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$132FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$59Average$152FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$86Average$350FlexibilityNo cancel feeOn-time62%
DeltaCheapest$92Average$283FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$143Average$350FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$145Average$337FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$166Average$257FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$166Average$430FlexibilityNo cancel feeOn-time63%

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