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Key Largo

$65+ 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 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — MIA
nov 29 — dez 61
sáb 11/29
sáb 12/6
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

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 outubro 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 12/3111:09 amBOS - MIA
1 stop8h 21mMultiple Airlines
sex 1/91:58 pmMIA - BOS
Nonstop3h 24mMultiple Airlines
Deal found 10/28$113
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 11/195:53 pmBOS - MIA
Nonstop3h 37mMultiple Airlines
qua 12/35:58 pmMIA - BOS
1 stop16h 24mMultiple Airlines
Deal found 10/28$121
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 11/1310:04 amBOS - MIA
1 stop14h 30mFrontier
sáb 11/156:35 pmMIA - BOS
1 stop14h 25mFrontier
Deal found 10/27$123
This Cheapflightsfares deal was found by Cheapflights users on 10/30. 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.
qua 11/195:53 pmBOS - MIA
Nonstop3h 37mSpirit Airlines
dom 11/236:46 amMIA - BOS
1 stop5h 49mSpirit Airlines
Deal found 10/30$129
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 11/178:40 amBOS - MIA
1 stop9h 27mFrontier
qui 11/209:59 pmMIA - BOS
1 stop9h 30mFrontier
Deal found 10/29$130
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
qua 11/195:53 pmBOS - MIA
Nonstop3h 37mMultiple Airlines
sáb 11/228:49 pmMIA - BOS
1 stop27h 20mMultiple Airlines
Deal found 10/30$132
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 11/1511:43 amBOS - MIA
1 stop23h 17mMultiple Airlines
ter 11/186:25 amMIA - BOS
2 stops17h 34mMultiple Airlines
Deal found 10/27$133
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 11/149:55 amBOS - MIA
1 stop24h 03mMultiple Airlines
sáb 11/156:35 pmMIA - BOS
1 stop14h 25mMultiple Airlines
Deal found 10/29$136
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 11/1310:04 amBOS - MIA
1 stop14h 30mMultiple Airlines
sáb 11/151:58 pmMIA - BOS
2 stops10h 01mMultiple Airlines
Deal found 10/27$139
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 11/126:16 amBOS - MIA
2 stops28h 44mMultiple Airlines
sáb 11/156:35 pmMIA - BOS
1 stop14h 25mMultiple Airlines
Deal found 10/28$140

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 outubro 30, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$112
(Cheapflightsfares)

One-way from

$65
(Frontier)

Popular in

April

Cheapest in

September

Average price

$249
Provider with most accurate pricing for Boston Logan Intl-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Miami flights.
Search Deals
From Boston Logan Intl to Key Largo
Search Deals
One-way flight from Boston Logan Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($0 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 outubro 30, 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

seg 12/15

3:20 pm-7:02 pm

Nonstop3h 42m

Miami

qua 12/24

8:45 am-2:47 pm

1 stop6h 02m

$158

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

dom 12/7

7:59 pm-11:37 pm

Nonstop3h 38m

Miami

sáb 12/13

6:53 am-10:15 am

Nonstop3h 22m

$159

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

sáb 12/6

7:59 pm-11:37 pm

Nonstop3h 38m

Miami

sex 12/12

7:59 pm-11:25 pm

Nonstop3h 26m

$159

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

ter 11/18

3:59 pm-7:37 pm

Nonstop3h 38m

Miami

ter 11/25

11:42 am-2:59 pm

Nonstop3h 17m

$167

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

sex 12/5

7:59 pm-11:37 pm

Nonstop3h 38m

Miami

sáb 12/6

7:59 pm-11:25 pm

Nonstop3h 26m

$168

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

sáb 12/6

6:25 pm-12:46 am

1 stop6h 21m

Miami

sáb 12/13

7:59 pm-11:25 pm

Nonstop3h 26m

$169

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

qua 12/3

7:59 pm-11:37 pm

Nonstop3h 38m

Miami

qui 12/4

6:53 am-10:15 am

Nonstop3h 22m

$177

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

qua 12/10

7:59 pm-11:37 pm

Nonstop3h 38m

Miami

sex 12/12

7:59 pm-11:25 pm

Nonstop3h 26m

$177

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

qua 12/10

6:25 pm-12:46 am

1 stop6h 21m

Miami

seg 12/15

7:59 pm-11:25 pm

Nonstop3h 26m

$178

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

sáb 12/13

7:00 am-2:25 pm

1 stop7h 25m

Miami

qua 12/24

2:01 pm-9:08 pm

1 stop7h 07m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 23 results
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2
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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 October 24, 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, January is the cheapest month in which you can book a flight from Boston to Key Largo (average of $41). Flying from Boston to Key Largo in August is currently the most expensive (average of $94). 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 outubro 30, 2025.

It’s typically best to fly out from Boston to Key Largo in the afternoon. Doing so could potentially save you 32% on the flight price compared to flying at noon, which is usually more expensive.

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

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 outubro 30, 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
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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
11,035 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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
2,906 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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
8,116 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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
3,122 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

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 8 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 156 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 42m. 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: Etihad Airways (100%), Japan Airlines (98%), JetBlue( 92%).

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

    The cheapest flight price from Boston to Key Largo is $74. On average you can expect to pay $696. The most popular route, (Boston Logan Intl - Miami), can usually be booked for $98.

  • 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, January is the cheapest month in which you can book a flight from Boston to Key Largo (average of $41). Flying from Boston to Key Largo in August is currently the most expensive (average of $94). 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 outubro 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$121FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$59Average$152FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$91Average$353FlexibilityNo cancel feeOn-time62%
DeltaCheapest$96Average$286FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$135Average$308FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$147Average$361FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$166Average$257FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$166Average$425FlexibilityNo cancel feeOn-time63%

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