HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boston

$109+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — BOS
Jun 1 — Jun 81
Mon 6/1
Mon 6/8
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 February, booked 82 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 May 2, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/1211:23 am
MIA
-
BOS
1 stop14h 01m
Frontier
Tue 5/196:00 am
BOS
-
MIA
1 stop16h 47m
Frontier
Deal found 4/28$146
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Wed 5/135:22 pm
MIA
-
BOS
1 stop8h 02m
Frontier
Wed 5/206:00 am
BOS
-
MIA
1 stop10h 27m
Frontier
Deal found 4/27$155
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/1211:23 am
MIA
-
BOS
1 stop14h 01m
Frontier
Tue 5/269:12 am
BOS
-
MIA
1 stop13h 35m
Frontier
Deal found 4/28$158
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/195:22 pm
MIA
-
BOS
1 stop8h 02m
Frontier
Tue 5/266:00 am
BOS
-
MIA
1 stop7h 20m
Frontier
Deal found 4/28$160
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Wed 5/205:22 pm
MIA
-
BOS
1 stop8h 02m
Frontier
Wed 5/276:00 am
BOS
-
MIA
1 stop7h 20m
Frontier
Deal found 4/28$164
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Wed 6/38:10 am
MIA
-
BOS
1 stop17h 14m
Frontier
Tue 6/169:10 am
BOS
-
MIA
1 stop7h 21m
Frontier
Deal found 4/27$173
This Kiwi.com deal was found by Cheapflights users on 5/1. 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 5/1611:23 am
MIA
-
BOS
1 stop14h 01m
Frontier
Tue 5/269:12 am
BOS
-
MIA
1 stop7h 15m
Frontier
Deal found 5/1$174
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/265:22 pm
MIA
-
BOS
2 stops17h 44m
Frontier
Tue 6/29:12 am
BOS
-
MIA
1 stop13h 35m
Frontier
Deal found 4/28$184

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 May 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$146
(Kiwi.com)

One-way from

$109
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$235
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. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
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 May 2, 2026.
Use the filters below to find and compare flights from Key Largo to Boston that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 5/15

6:35 am-2:15 pm

1 stop7h 40m

Boston Logan Intl

Sat 5/16

3:20 pm-6:59 pm

Nonstop3h 39m

$237

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 7/1

11:50 am-3:20 pm

Nonstop3h 30m

Boston Logan Intl

Wed 7/8

5:30 am-12:28 pm

1 stop6h 58m

$237

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 5/29

7:57 pm-11:31 pm

Nonstop3h 34m

Boston Logan Intl

Wed 6/3

6:51 am-12:56 pm

1 stop6h 05m

$237

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 5/15

7:00 am-1:51 pm

1 stop6h 51m

Boston Logan Intl

Sun 5/17

6:00 am-1:13 pm

1 stop7h 13m

$244

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 6/20

3:25 pm-10:41 pm

1 stop7h 16m

Boston Logan Intl

Tue 6/23

5:30 am-12:30 pm

1 stop7h 00m

$247

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 5/23

12:00 pm-7:24 pm

1 stop7h 24m

Boston Logan Intl

Sun 5/24

3:00 pm-9:03 pm

1 stop6h 03m

$247

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 5/23

7:57 pm-11:31 pm

Nonstop3h 34m

Boston Logan Intl

Tue 5/26

3:20 pm-6:59 pm

Nonstop3h 39m

$247

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 7/25

7:55 pm-11:33 pm

Nonstop3h 38m

Boston Logan Intl

Mon 8/10

7:00 am-10:34 am

Nonstop3h 34m

$257

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 5/27

8:25 am-4:28 pm

1 stop8h 03m

Boston Logan Intl

Wed 6/3

10:00 am-6:20 pm

1 stop8h 20m

$267
Quickest round-trip

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 7/1

7:59 pm-11:35 pm

Nonstop3h 36m

Boston Logan Intl

Sun 7/5

7:20 am-10:49 am

Nonstop3h 29m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 23 resultsSorted by cheapest first
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

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 May 2, 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 morning tend to be the most expensive. A flight in the evening could potentially save you up to 42% 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 April 25, 2026.

Travelers seeking maximum savings on their Key Largo to Boston flight should consider departing on Tuesday evenings 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 May 2, 2026.

The most flights from KE9 to BOS are scheduled on a Friday (31 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (14 on average).

How much does it cost to fly round-trip from Key Largo to Boston?

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 May 2, 2026.
See what other customers who have flown with Delta,American Airlines, andJetBlue 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
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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
8,460 reviews
Delta
7.9
Good
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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
7.1
Good
11,671 reviews
Delta
7.9
Good
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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
7.1
Good
2,967 reviews
Delta
7.9
Good
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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
8,640 reviews
Delta
7.9
Good
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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
2,971 reviews
Delta
7.9
Good
8,460 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

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 23 inbound flights from Key Largo per day. You should also have plenty of airline options to choose from since 6 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 22 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 6h 51m. Fly via Delta or United Airlines 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 Spirit Airlines, which is currently one of the cheapest options available, starting at $42. Frontier flights start at $71 while deals on Delta start at $85 one-way.

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

    Consider Japan Airlines (93%), EL AL (86%) or British Airways (85%) 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 $943 for a flight from Key Largo to Boston. The cheapest flight overall is $93 while the most popular route, (Miami - Boston Logan Intl) is currently priced at $204.

  • 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.

See more FAQs

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Medford
Cambridge
Concord
Hampton Beach
Watertown
Brockton
Seekonk
Cranston
Chelsea
Warwick
Peabody
Seabrook
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy
Waltham
Lowell
Braintree

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.

Top 6 airlines flying from Key Largo to Boston

Discover the top 6 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 May 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$51Average$150FlexibilityNo cancel feeOn-time65%
FrontierCheapest$65Average$142FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$93Average$305FlexibilityNo cancel feeOn-time62%
DeltaCheapest$101Average$230FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$133Average$334FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$134Average$322FlexibilityNo cancel feeOn-time71%

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.