HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boston

$68+ 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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — BOS
Feb 6 — Feb 131
Fri 2/6
Fri 2/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Boston with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
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

Keep the following information in mind while searching for Key Largo to Boston flight deals. Data was last updated January 7, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$82
(Cheapflightsfares)

One-way from

$68
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$150
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. 5% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 7, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/6. 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 1/2212:56 pmMIA - BOS
Nonstop3h 23mSpirit Airlines
Sun 1/255:23 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/6$82
This Cheapflightsfares deal was found by Cheapflights users on 1/5. 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.
Fri 2/138:37 pmMIA - BOS
Nonstop3h 22mSpirit Airlines
Wed 2/185:50 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/5$85
This CheapOair deal was found by Cheapflights users on 1/5. 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.
Fri 2/278:37 pmMIA - BOS
Nonstop3h 22mSpirit Airlines
Tue 3/33:54 pmBOS - MIA
Nonstop3h 38mSpirit Airlines
Deal found 1/5$86
This Priceline deal was found by Cheapflights users on 1/7. 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 1/2312:56 pmMIA - BOS
Nonstop3h 23mSpirit Airlines
Sun 1/255:23 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/7$87
This Priceline deal was found by Cheapflights users on 1/6. 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.
Tue 5/191:34 pmMIA - BOS
Nonstop3h 24mSpirit Airlines
Tue 5/265:55 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/6$89
This CheapOair deal was found by Cheapflights users on 1/7. 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.
Thu 1/2912:56 pmMIA - BOS
Nonstop3h 23mSpirit Airlines
Sun 2/15:53 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/7$90
This Mytrip deal was found by Cheapflights users on 1/7. 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.
Tue 2/36:59 pmMIA - BOS
1 stop6h 04mMultiple Airlines
Sat 2/75:53 pmBOS - MIA
Nonstop3h 42mMultiple Airlines
Deal found 1/7$94
This Kiwi.com deal was found by Cheapflights users on 1/5. 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 1/247:00 amMIA - BOS
1 stop18h 13mMultiple Airlines
Tue 1/275:23 pmBOS - MIA
Nonstop3h 42mMultiple Airlines
Deal found 1/5$95
This Kiwi.com deal was found by Cheapflights users on 1/7. 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 2/248:37 pmMIA - BOS
Nonstop3h 22mSpirit Airlines
Sun 3/15:50 pmBOS - MIA
Nonstop3h 42mSpirit Airlines
Deal found 1/7$96
This Kiwi.com deal was found by Cheapflights users on 1/5. 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.
Fri 1/237:09 pmMIA - BOS
1 stop30h 04mMultiple Airlines
Sat 1/315:23 pmBOS - MIA
Nonstop3h 42mMultiple Airlines
Deal found 1/5$97

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 January 7, 2026.
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

Thu 2/12

8:37 pm-11:59 pm

Nonstop3h 22m

Boston Logan Intl

Mon 2/16

5:50 pm-9:32 pm

Nonstop3h 42m

$108

MiamiBoston

MIA - BOS

MIABOS

Miami

Tue 5/5

1:34 pm-4:58 pm

Nonstop3h 24m

Boston Logan Intl

Mon 5/11

5:55 pm-9:37 pm

Nonstop3h 42m

$109

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 5/8

1:34 pm-4:58 pm

Nonstop3h 24m

Boston Logan Intl

Sat 5/9

8:52 am-5:18 pm

1 stop8h 26m

$154

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 2/12

10:56 pm-9:19 am

1 stop10h 23m

Boston Logan Intl

Mon 2/16

6:00 am-10:28 am

1 stop28h 28m

$160

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 1/31

6:55 am-10:14 am

Nonstop3h 19m

Boston Logan Intl

Mon 2/2

7:05 am-10:53 am

Nonstop3h 48m

$167

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 1/29

7:00 am-12:23 pm

1 stop5h 23m

Boston Logan Intl

Sun 2/1

7:59 pm-11:51 pm

Nonstop3h 52m

$177

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 2/26

7:00 am-10:20 am

Nonstop3h 20m

Boston Logan Intl

Sun 3/1

7:59 pm-11:51 pm

Nonstop3h 52m

$179

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 1/22

7:00 am-12:23 pm

1 stop5h 23m

Boston Logan Intl

Mon 1/26

5:00 pm-11:20 pm

1 stop6h 20m

$187

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 1/21

7:00 am-1:22 pm

1 stop6h 22m

Boston Logan Intl

Wed 1/21

6:35 pm-12:51 am

1 stop6h 16m

$187

MiamiBoston

MIA - BOS

MIABOS

Miami

Thu 2/26

7:00 am-1:19 pm

1 stop6h 19m

Boston Logan Intl

Sat 2/28

7:59 pm-11:51 pm

Nonstop3h 52m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

Showing 1-10 of 21 results
1
2
3

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 January 2, 2026.

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 December is currently the most expensive (average of $99). 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 January 7, 2026.

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 afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 41% 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 January 3, 2026.

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. 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 January 7, 2026.

The most flights from KE9 to BOS are scheduled on a Wednesday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 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 January 7, 2026.
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
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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
8,025 reviews
Delta
7.9
Good
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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
11,095 reviews
Delta
7.9
Good
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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
2,896 reviews
Delta
7.9
Good
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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
8,287 reviews
Delta
7.9
Good
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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
5.7
Fair
3,062 reviews
Delta
7.9
Good
8,025 reviews

Comfort

7.9

Overall

7.9

Food

7.2

Crew

8.5

Boarding

8.1

Entertainment

7.8

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 28 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 19m. Fly via Spirit Airlines, Frontier, or Delta to get the fastest option. The distance from Key Largo to Boston is about 1259 mi. This flight may include one or multiple stops.

  • 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 $29. Spirit Airlines flights start at $40 while deals on Delta start at $77 one-way.

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

    Consider Republic Airways (88%), Iberia (84%) or American Airlines (83%) 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 $566 for a flight from Key Largo to Boston. The cheapest flight overall is $53 while the most popular route, (Miami - Boston Logan Intl) is currently priced at $58.

  • 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 December is currently the most expensive (average of $99). 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
Seekonk
Brockton
Seabrook
Cranston
Lincoln
Lowell
Smithfield
Peabody
Quincy
York Beach
Warwick
Londonderry
Swansea
Old Orchard Beach
Waltham
Chelsea

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Boston

See prices for flight routes from nearby airports that may be better suited for you.
Tampa to Boston flights
Orlando to Boston flights
Miami to Boston flights
Fort Lauderdale to Boston flights
Orlando to Hartford flights
Jacksonville to Boston flights
Sarasota to Boston flights
West Palm Beach to Boston flights
Tampa to Hartford flights
Fort Myers to Boston flights
Orlando to Albany flights
Fort Lauderdale to Hartford flights
West Palm Beach to Hartford flights
Daytona Beach to Boston flights
Fort Myers to Hartford flights
Fort Lauderdale to Albany flights
Tampa to Albany flights
Sarasota to Hartford flights
West Palm Beach to Albany flights
Orlando to Worcester flights
Pensacola to Boston flights
Miami to Hartford flights
Miami to Albany flights
Gainesville to Boston flights
Valparaiso to Boston flights
Fort Lauderdale to Worcester flights
Jacksonville to Hartford flights
Fort Myers to Albany flights
Tallahassee to Boston flights
Panama City to Boston flights
Jacksonville to Albany flights
Jacksonville to Worcester flights
Sarasota to Albany flights
Key West to Boston flights
Pensacola to Hartford flights
Tampa to Worcester flights
West Palm Beach to Worcester flights
Melbourne to Boston flights
Gainesville to Hartford flights
Pensacola to Albany flights
Daytona Beach to Hartford flights
Valparaiso to Hartford flights
Orlando to Hyannis flights
Jacksonville to West Tisbury flights
Tampa to West Tisbury flights
Fort Lauderdale to Hyannis flights
Panama City to Albany flights
Panama City to Hartford flights
Tampa to Hyannis flights
Valdosta to Boston flights

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 January 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$82FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$56Average$141FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$89Average$300FlexibilityNo cancel feeOn-time62%
DeltaCheapest$112Average$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%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.