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$69+ Cheap flights from Key Largo, FL to Boston (BOS)

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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — BOS
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Boston Logan Intl are usually found in January or September, booked 82 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Key Largo to Boston

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

Round-trip from

$119
(Expedia)

One-way from

$69
(Delta)

Popular in

July

Cheapest in

January

Average price

$227
From Key Largo to Boston Logan Intl
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One-way flight from Key Largo to Boston Logan Intl
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Highest demand for flights based on searches. 17% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Key Largo to Boston

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

This Expedia deal was found by Cheapflights users on 8/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:40 pmMIA - BOS
Nonstop3h 16mSpirit Airlines
Fri 10/104:54 pmBOS - MIA
Nonstop3h 38mSpirit Airlines
Deal found 8/15$119
This eDestinos deal was found by Cheapflights users on 8/14. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/125:10 pmMIA - BOS
1 stop5h 37mSpirit Airlines
Sat 9/202:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Deal found 8/14$121
This eDestinos deal was found by Cheapflights users on 8/15. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/410:35 amMIA - BOS
1 stop7h 27mSpirit Airlines
Sun 9/142:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Deal found 8/15$122
This Gotogate deal was found by Cheapflights users on 8/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/69:56 amMIA - BOS
Nonstop3h 27mMultiple Airlines
Sun 9/79:38 amBOS - MIA
1 stop10h 43mMultiple Airlines
Deal found 8/15$123
This Priceline deal was found by Cheapflights users on 8/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1012:40 pmMIA - BOS
Nonstop3h 16mMultiple Airlines
Sun 10/128:12 amBOS - MIA
1 stop7h 51mMultiple Airlines
Deal found 8/15$126
This Delta deal was found by Cheapflights users on 8/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:59 pmMIA - BOS
Nonstop3h 27mDelta
Wed 9/1710:30 amBOS - MIA
1 stop8h 21mDelta
Deal found 8/15$127
This Frontier deal was found by Cheapflights users on 8/15. 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.
Thu 10/237:24 amMIA - BOS
Nonstop3h 25mFrontier
Sun 10/2611:44 amBOS - MIA
Nonstop3h 36mFrontier
Deal found 8/15$128
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/49:56 amMIA - BOS
Nonstop3h 27mMultiple Airlines
Sun 9/79:38 amBOS - MIA
1 stop10h 43mMultiple Airlines
Deal found 8/15$129
This eDestinos deal was found by Cheapflights users on 8/14. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/510:35 amMIA - BOS
1 stop7h 27mSpirit Airlines
Sun 9/142:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Deal found 8/14$130
This FlightHub deal was found by Cheapflights users on 8/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/139:56 amMIA - BOS
Nonstop3h 27mMultiple Airlines
Sun 9/219:38 amBOS - MIA
1 stop10h 43mMultiple Airlines
Deal found 8/15$131
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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.
Thu 9/259:56 amMIA - BOS
Nonstop3h 27mSpirit Airlines
Sat 9/272:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Deal found 8/14$132
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/195:10 pmMIA - BOS
1 stop5h 37mSpirit Airlines
Sat 9/202:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Deal found 8/14$133

Cheapflights Fare Finder

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

Fly from

Key Largo

Fly to

Boston

Route

Depart

Return

Price

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 10/11

9:56 am-1:13 pm

Nonstop3h 17m

Boston Logan Intl

Mon 10/13

4:54 pm-8:32 pm

Nonstop3h 38m

$121

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 9/4

7:25 am-7:52 am

1 stop24h 27m

Boston Logan Intl

Sat 9/13

2:18 pm-5:50 pm

Nonstop3h 32m

$122

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 9/4

10:35 am-6:02 pm

1 stop7h 27m

Boston Logan Intl

Sun 9/14

2:18 pm-5:50 pm

Nonstop3h 32m

$122

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 9/6

9:56 am-1:23 pm

Nonstop3h 27m

Boston Logan Intl

Sun 9/7

9:38 am-8:21 pm

1 stop10h 43m

$123

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 10/23

7:24 am-10:49 am

Nonstop3h 25m

Boston Logan Intl

Sun 10/26

11:44 am-3:20 pm

Nonstop3h 36m

$126

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 10/10

12:40 pm-3:56 pm

Nonstop3h 16m

Boston Logan Intl

Sun 10/12

8:12 am-4:03 pm

1 stop7h 51m

$126

MiamiBoston

MIA - BOS

MIABOS

Miami

Tue 9/30

12:06 pm-6:31 pm

1 stop6h 25m

Boston Logan Intl

Tue 10/7

7:35 am-11:10 am

Nonstop3h 35m

$127

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 9/6

7:35 pm-11:10 pm

Nonstop3h 35m

Boston Logan Intl

Wed 9/24

10:00 am-4:28 pm

1 stop6h 28m

$127

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 11/1

7:35 pm-11:00 pm

Nonstop3h 25m

Boston Logan Intl

Wed 11/12

10:30 am-7:13 pm

1 stop8h 43m

$127

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 10/18

7:35 pm-11:00 pm

Nonstop3h 25m

Boston Logan Intl

Sat 10/25

6:00 am-2:17 pm

1 stop8h 17m

$127

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 18 results
1
2

Best time to book a flight from Key Largo to Boston

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

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Boston. Price data was last updated on August 8, 2025.

The price you pay for your flight from Key Largo to Boston may vary depending on when you book. For the best chance of a lower fare, look to book 82 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 Key Largo to Boston?

Currently, January is the cheapest month in which you can book a flight from Key Largo to Boston (average of $218). Flying from Key Largo to Boston in July is currently the most expensive (average of $311). 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 BOS?

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Key Largo to Boston as you normally would.

What is the cheapest day to fly from Key Largo to Boston?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Boston. Price data was last updated on August 10, 2025.

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

Weekly flight availability from Key Largo to Boston

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

The most flights from KE9 to BOS are scheduled on a Wednesday (31 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (23 on average).

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated August 16, 2025.
See what other customers who have flown with Delta, American Airlines, and JetBlue from Key Largo to Boston have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,985 reviews
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
JetBlue
7.2
Good
2,916 reviews
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Spirit Airlines
6.3
Okay
8,042 reviews
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Frontier
5.8
Fair
3,211 reviews
Delta
8.0
Very good
7,985 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

Related info for your journey

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

    Boston Logan Intl (BOS) is the airport you will fly into if you book a flight from Key Largo to Boston. You should not have trouble finding flights to Logan Intl from Key Largo; the airport handles an average of 28 inbound flights from Key Largo per day. You should also have plenty of airline options to choose from since 7 airlines have flights to the Boston airport from Key Largo. It is only a 2.6 mi journey from Logan Intl (BOS) to Boston’s city center.

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

    Flights from Key Largo to Boston Logan Intl have been viewed 29 times in the past calendar month.

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

    Consider Royal Air Maroc (100%), Japan Airlines (84%) or EL AL (82%) when booking your flight. These represent the most reliable airlines when flying from Key Largo to Boston.

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

    On average you can expect to pay $482 for a flight from Key Largo to Boston. The cheapest flight overall is $66 while the most popular route, (Miami - Boston Logan Intl) is currently priced at $73.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Boston (average of $218). Flying from Key Largo to Boston in July is currently the most expensive (average of $311). 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 Boston?

Book flights to Boston if you plan to visit one of these locations
Cambridge
Medford
Watertown
Hampton Beach
Waltham
Seabrook
Lowell
Lincoln
Smithfield
Cranston
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York Beach
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Saugus
Burlington
Braintree

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Top 7 airlines flying from Key Largo to Boston

Discover the top 7 airlines that operate flights from Key Largo to Boston. 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 August 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$37Average$82FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$59Average$140FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$76Average$303FlexibilityNo cancel feeOn-time62%
DeltaCheapest$88Average$261FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$88Average$308FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$178FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$198Average$288FlexibilityNo cancel feeOn-time69%

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