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Key Largo

$76+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — MIA
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
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 15 days in advance, depart on a Thursday or Saturday and return on a Thursday

Cheap 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 December 16, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/13. 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 12/3112:29 pmBOS - MIA
2 stops24h 37mSpirit Airlines
Tue 1/1312:56 pmMIA - BOS
Nonstop3h 23mSpirit Airlines
Deal found 12/13$159
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amBOS - MIA
1 stop7h 06mMultiple Airlines
Tue 1/1312:56 pmMIA - BOS
Nonstop3h 23mMultiple Airlines
Deal found 12/15$167
This Kiwi.com deal was found by Cheapflights users on 12/13. 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 12/3112:29 pmBOS - MIA
2 stops24h 37mSpirit Airlines
Mon 1/1212:56 pmMIA - BOS
Nonstop3h 23mSpirit Airlines
Deal found 12/13$170
This Delta deal was found by Cheapflights users on 12/13. 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.
Wed 12/316:15 pmBOS - MIA
1 stop6h 16mDelta
Tue 1/138:25 pmMIA - BOS
Nonstop3h 33mDelta
Deal found 12/13$181
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:29 pmBOS - MIA
2 stops24h 37mMultiple Airlines
Wed 1/77:09 pmMIA - BOS
1 stop6h 10mMultiple Airlines
Deal found 12/15$185
This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
Tue 12/3011:02 amBOS - MIA
1 stop9h 27mMultiple Airlines
Tue 1/1312:56 pmMIA - BOS
Nonstop3h 23mMultiple Airlines
Deal found 12/13$188
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:43 amBOS - MIA
1 stop10h 26mFrontier
Tue 1/136:56 pmMIA - BOS
1 stop6h 17mFrontier
Deal found 12/15$191
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:02 amBOS - MIA
1 stop9h 27mFrontier
Wed 1/77:09 pmMIA - BOS
1 stop6h 10mFrontier
Deal found 12/15$192

Find 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 December 16, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$142
(Kiwi.com)

One-way from

$76
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$327
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. 12% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 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 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 December 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

Mon 1/12

11:00 am-6:54 pm

1 stop7h 54m

Miami

Wed 1/14

11:31 am-2:56 pm

Nonstop3h 25m

$189

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Wed 1/28

6:35 pm-12:51 am

1 stop6h 16m

Miami

Mon 2/9

8:30 pm-11:59 pm

Nonstop3h 29m

$190

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Fri 1/30

12:00 pm-7:04 pm

1 stop7h 04m

Miami

Sat 2/14

7:00 am-10:20 am

Nonstop3h 20m

$198

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Tue 2/17

6:45 pm-12:53 am

1 stop6h 08m

Miami

Fri 2/27

7:00 am-2:14 pm

1 stop7h 14m

$199

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Wed 2/4

1:00 pm-7:04 pm

1 stop6h 04m

Miami

Sun 2/8

6:55 am-10:14 am

Nonstop3h 19m

$200

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Mon 3/16

5:15 pm-11:24 pm

1 stop6h 09m

Miami

Thu 3/19

7:00 am-1:15 pm

1 stop6h 15m

$217

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Wed 2/25

7:05 am-1:37 pm

1 stop6h 32m

Miami

Wed 3/4

10:55 am-7:08 pm

2 stops8h 13m

$222

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Mon 2/23

10:30 am-5:24 pm

1 stop6h 54m

Miami

Sat 2/28

7:14 am-3:12 pm

1 stop7h 58m

$241

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Tue 1/20

9:00 am-2:35 pm

1 stop5h 35m

Miami

Thu 1/22

7:00 am-1:22 pm

1 stop6h 22m

$254

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Thu 1/29

6:35 pm-12:51 am

1 stop6h 16m

Miami

Mon 2/9

7:25 pm-1:04 am

1 stop5h 39m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 23 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 December 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 15 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 December is currently the most expensive (average of $103). 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 December 16, 2025.

It’s typically best to fly out from Boston to Key Largo in the afternoon. Doing so could potentially save you 31% 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. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 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
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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
8,008 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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
11,049 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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
2,895 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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
8,186 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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
3,082 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.5

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 10 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 149 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 7h 54m. There are 1259 mi between Boston and Key Largo.

  • What are the cheapest airlines to fly from Boston to Key Largo one-way?

    $26 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and Southwest, with prices starting from $35 and $62, respectively.

  • 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 (90%), GOL (76%), Qatar Airways( 74%).

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

    The cheapest flight price from Boston to Key Largo is $83. On average you can expect to pay $665. The most popular route, (Boston Logan Intl - Miami), can usually be booked for $49.

  • 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 December is currently the most expensive (average of $103). 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$118FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$61Average$159FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$94Average$355FlexibilityNo cancel feeOn-time62%
DeltaCheapest$101Average$302FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$135Average$306FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$154Average$351FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$166Average$257FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$166Average$436FlexibilityNo cancel feeOn-time63%

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