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$71+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — BOS
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
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 March, booked 70 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap 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 December 16, 2025.

This Frontier deal was found by Cheapflights users on 12/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:05 pmMIA - BOS
1 stop6h 09mFrontier
Tue 1/66:00 amBOS - MIA
1 stop12h 11mFrontier
Deal found 12/14$140
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/203:29 pmMIA - BOS
1 stop19h 58mMultiple Airlines
Wed 1/76:00 amBOS - MIA
1 stop7h 06mMultiple Airlines
Deal found 12/14$164
This Delta deal was found by Cheapflights users on 12/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2411:14 amMIA - BOS
Nonstop3h 25mDelta
Tue 1/63:30 pmBOS - MIA
Nonstop3h 46mDelta
Deal found 12/14$171
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:59 pmMIA - BOS
1 stop27h 15mMultiple Airlines
Thu 1/110:47 amBOS - MIA
1 stop9h 26mMultiple Airlines
Deal found 12/14$175
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amMIA - BOS
1 stop17h 14mMultiple Airlines
Thu 1/110:47 amBOS - MIA
1 stop9h 26mMultiple Airlines
Deal found 12/14$176
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:10 pmMIA - BOS
1 stop6h 09mFrontier
Sun 1/411:03 amBOS - MIA
1 stop8h 27mFrontier
Deal found 12/15$179
This Delta deal was found by Cheapflights users on 12/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:01 pmMIA - BOS
1 stop6h 07mDelta
Sun 1/117:05 amBOS - MIA
Nonstop3h 48mDelta
Deal found 12/14$181
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 12/297:10 pmMIA - BOS
1 stop6h 09mFrontier
Sat 1/311:06 amBOS - MIA
1 stop9h 34mFrontier
Deal found 12/15$183
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 12/237:05 pmMIA - BOS
1 stop6h 19mFrontier
Sun 1/411:03 amBOS - MIA
1 stop8h 27mFrontier
Deal found 12/15$184
This Frontier deal was found by Cheapflights users on 12/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:05 pmMIA - BOS
1 stop6h 09mFrontier
Tue 1/66:00 amBOS - MIA
1 stop12h 11mFrontier
Deal found 12/14$185
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:00 amMIA - BOS
Nonstop3h 19mDelta
Wed 12/316:15 pmBOS - MIA
1 stop6h 16mDelta
Deal found 12/16$189

Find 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 December 16, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$121
(Kiwi.com)

One-way from

$71
(CheapOair)

Popular in

July

Cheapest in

January

Average price

$233
Provider with most accurate pricing for Miami-Boston Logan Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Boston Logan Intl flights.
Search Deals
From Key Largo to Boston Logan Intl
Search Deals
One-way flight from Key Largo to Boston Logan Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 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 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 December 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

Wed 1/21

12:55 pm-4:23 pm

Nonstop3h 28m

Boston Logan Intl

Wed 1/28

3:50 pm-7:33 pm

Nonstop3h 43m

$163

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 1/29

8:30 pm-11:59 pm

Nonstop3h 29m

Boston Logan Intl

Mon 2/2

3:50 pm-7:33 pm

Nonstop3h 43m

$163

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 1/8

8:25 pm-11:58 pm

Nonstop3h 33m

Boston Logan Intl

Mon 1/12

3:30 pm-7:16 pm

Nonstop3h 46m

$163

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 12/24

11:14 am-2:39 pm

Nonstop3h 25m

Boston Logan Intl

Tue 1/6

3:30 pm-7:16 pm

Nonstop3h 46m

$171

MiamiBoston

MIA - BOS

MIABOS

Miami

Tue 1/13

11:31 am-2:56 pm

Nonstop3h 25m

Boston Logan Intl

Tue 1/20

1:00 pm-7:04 pm

1 stop6h 04m

$173

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 1/8

10:30 am-4:15 pm

1 stop5h 45m

Boston Logan Intl

Tue 1/13

3:30 pm-7:16 pm

Nonstop3h 46m

$173

MiamiBoston

MIA - BOS

MIABOS

Miami

Tue 1/13

7:00 am-3:22 pm

1 stop8h 22m

Boston Logan Intl

Mon 1/19

3:50 pm-7:33 pm

Nonstop3h 43m

$173

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 1/14

8:25 pm-11:58 pm

Nonstop3h 33m

Boston Logan Intl

Wed 1/21

2:00 pm-9:10 pm

1 stop7h 10m

$173

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 1/16

11:39 am-6:30 pm

1 stop6h 51m

Boston Logan Intl

Mon 1/19

10:05 am-4:30 pm

1 stop6h 25m

$183

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 1/9

5:50 am-2:20 pm

1 stop8h 30m

Boston Logan Intl

Mon 1/12

9:00 am-2:35 pm

1 stop5h 35m

$183

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 21 results
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2
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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 December 12, 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 70 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, February is the cheapest month in which you can book a flight from Key Largo to Boston (average of $19). Flying from Key Largo to Boston in November is currently the most expensive (average of $98). 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 December 16, 2025.

One of the essential ways to save on airfare from Key Largo to Boston is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 20% on airfare.

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 December 13, 2025.

Travelers seeking maximum savings on their Key Largo to Boston flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday 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 December 16, 2025.

The most flights from KE9 to BOS are scheduled on a Friday (27 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (8 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 December 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
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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
7.9
Good
8,008 reviews
Delta
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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
11,049 reviews
Delta
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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
2,895 reviews
Delta
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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
8,186 reviews
Delta
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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
3,082 reviews
Delta
7.9
Good
8,008 reviews

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.3

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 20 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 34 times in the past calendar month.

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

    There are many flights that can get you from Key Largo to Boston in 3h 28m. Fly via Delta to get the fastest option. The distance from Key Largo to Boston is about 1259 mi. All flights are typically nonstop.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $28. Spirit Airlines flights start at $41 while deals on Delta start at $76 one-way.

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

    Consider Japan Airlines (100%), Republic Airways (83%) or American Airlines (81%) 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 $521 for a flight from Key Largo to Boston. The cheapest flight overall is $68 while the most popular route, (Miami - Boston Logan Intl) is currently priced at $49.

  • 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, February is the cheapest month in which you can book a flight from Key Largo to Boston (average of $19). Flying from Key Largo to Boston in November is currently the most expensive (average of $98). 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
Hampton Beach
Watertown
Seabrook
Seekonk
Brockton
Cranston
Lincoln
Lowell
Smithfield
Peabody
Quincy
York Beach
Warwick
Londonderry
Swansea
Old Orchard Beach
Waltham
Chelsea

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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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$37Average$80FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$61Average$144FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$89Average$309FlexibilityNo cancel feeOn-time62%
DeltaCheapest$107Average$219FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$127Average$312FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$178FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$186Average$288FlexibilityNo cancel feeOn-time69%

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