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$129+ 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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — BOS
Aug 13 — Aug 201
Thu 8/13
Thu 8/20
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 February, booked 81 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 July 14, 2026.

This Delta deal was found by Cheapflights users on 7/13. 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.
Thu 10/111:49 am
MIA
-
BOS
Nonstop3h 26m
Delta
Sat 10/107:15 am
BOS
-
MIA
Nonstop3h 37m
Delta
Deal found 7/13$257
This Southwest deal was found by Cheapflights users on 7/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:45 am
MIA
-
BOS
2 stops10h 10m
Southwest
Sat 8/225:50 am
BOS
-
MIA
2 stops9h 10m
Southwest
Deal found 7/13$258
This Kiwi.com deal was found by Cheapflights users on 7/11. 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.
Thu 8/136:42 pm
MIA
-
BOS
1 stop13h 04m
Frontier
Tue 8/1812:45 pm
BOS
-
MIA
1 stop10h 20m
Frontier
Deal found 7/11$259
This Booking.com deal was found by Cheapflights users on 7/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/303:30 pm
MIA
-
BOS
1 stop20h 20m
Frontier
Wed 9/212:45 pm
BOS
-
MIA
1 stop10h 20m
Frontier
Deal found 7/9$260
This American Airlines deal was found by Cheapflights users on 7/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/134:32 pm
MIA
-
BOS
1 stop5h 58m
American Airlines
Sat 8/226:10 pm
BOS
-
MIA
Nonstop3h 40m
American Airlines
Deal found 7/9$261
This Kiwi.com deal was found by Cheapflights users on 7/10. 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 8/76:42 pm
MIA
-
BOS
1 stop13h 00m
Frontier
Tue 8/1111:59 am
BOS
-
MIA
1 stop11h 07m
Frontier
Deal found 7/10$262
This Delta deal was found by Cheapflights users on 7/12. 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.
Sun 8/236:00 am
MIA
-
BOS
1 stop5h 40m
Delta
Sat 8/2912:20 pm
BOS
-
MIA
1 stop6h 22m
Delta
Deal found 7/12$263
This Southwest deal was found by Cheapflights users on 7/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2111:45 am
MIA
-
BOS
1 stop10h 35m
Southwest
Mon 8/245:50 am
BOS
-
MIA
1 stop5h 15m
Southwest
Deal found 7/9$264
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 8/56:42 pm
MIA
-
BOS
1 stop16h 15m
Frontier
Wed 8/128:41 am
BOS
-
MIA
1 stop11h 49m
Frontier
Deal found 7/9$266
This Kiwi.com deal was found by Cheapflights users on 7/11. 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 8/43:07 pm
MIA
-
BOS
1 stop19h 57m
Frontier
Wed 8/128:41 am
BOS
-
MIA
2 stops9h 06m
Frontier
Deal found 7/11$267
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Thu 8/66:42 pm
MIA
-
BOS
1 stop13h 04m
Frontier
Tue 8/1111:59 am
BOS
-
MIA
1 stop11h 07m
Frontier
Deal found 7/10$268

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 July 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$257
(Delta)

One-way from

$129
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$336
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. 23% potential increase in price ($78 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 14, 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

Thu 9/24

5:05 pm-10:10 pm

1 stop5h 05m

Boston Logan Intl

Tue 9/29

5:25 am-10:55 am

1 stop5h 30m

$268

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 9/2

1:44 pm-9:59 pm

2 stops8h 15m

Boston Logan Intl

Fri 9/4

9:33 am-4:31 pm

1 stop6h 58m

$282
Quickest round-trip

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 10/9

7:59 pm-11:33 pm

Nonstop3h 34m

Boston Logan Intl

Tue 10/13

3:33 pm-7:04 pm

Nonstop3h 31m

$294

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 8/14

7:00 am-2:30 pm

2 stops7h 30m

Boston Logan Intl

Tue 8/18

5:25 am-3:15 pm

2 stops9h 50m

$297

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 8/12

3:17 pm-10:43 pm

1 stop7h 26m

Boston Logan Intl

Mon 8/17

3:20 pm-7:03 pm

Nonstop3h 43m

$304

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 7/29

12:05 pm-6:00 pm

1 stop5h 55m

Boston Logan Intl

Wed 8/5

5:30 am-12:17 pm

1 stop6h 47m

$307

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 7/24

7:55 pm-11:33 pm

Nonstop3h 38m

Boston Logan Intl

Tue 7/28

7:05 am-10:35 am

Nonstop3h 30m

$307

MiamiBoston

MIA - BOS

MIABOS

Miami

Wed 8/5

3:17 pm-10:43 pm

1 stop7h 26m

Boston Logan Intl

Mon 8/10

6:50 am-2:54 pm

1 stop8h 04m

$317

MiamiBoston

MIA - BOS

MIABOS

Miami

Sat 9/5

10:00 am-4:33 pm

1 stop6h 33m

Boston Logan Intl

Mon 9/7

5:30 am-1:02 pm

1 stop7h 32m

$317

MiamiBoston

MIA - BOS

MIABOS

Miami

Fri 9/4

7:15 am-5:55 pm

1 stop10h 40m

Boston Logan Intl

Mon 9/7

5:25 am-11:50 am

1 stop6h 25m

$322

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/11

Showing 1-10 of 20 resultsSorted by cheapest first
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

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 July 14, 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 at noon tend to be the most expensive. A flight in the evening could potentially save you up to 33% on airfare.

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 July 14, 2026.

The most flights from KE9 to BOS are scheduled on a Friday (27 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 on average).

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

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 July 11, 2026.

Travelers seeking maximum savings on their Key Largo to Boston flight should consider departing on Wednesday 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.

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 July 14, 2026.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines 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
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Delta
7.8
Good
8,467 reviews
Delta
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
United Airlines
7.4
Good
9,988 reviews
Delta
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
American Airlines
7.1
Good
11,808 reviews
Delta
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
JetBlue
7.1
Good
3,010 reviews
Delta
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Frontier
5.6
Fair
2,811 reviews
Delta
7.8
Good
8,467 reviews

Overall

7.8

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good

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 18 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 34m. Fly via Southwest, United Airlines, 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 $80. Delta flights start at $87 while deals on American Airlines start at $91 one-way.

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

    Consider Japan Airlines (93%), British Airways (89%) or EL AL (87%) 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 $1,093 for a flight from Key Largo to Boston. The cheapest flight overall is $128 while the most popular route, (Miami - Boston Logan Intl) is currently priced at $159.

  • 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
Waltham
Randolph
Cambridge
Concord
Brockton
Seekonk
Hampton Beach
Cranston
Dedham
Warwick
Peabody
Auburn
York Beach
Chelsea
Londonderry
Swansea
Fitchburg
North Falmouth
Braintree
Sandwich

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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 July 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$44Average$123FlexibilityNo cancel feeOn-time88%
FrontierCheapest$65Average$226FlexibilityNo cancel feeOn-time62%
DeltaCheapest$111Average$293FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$117Average$329FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$142Average$334FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$186Average$377FlexibilityNo cancel feeOn-time69%

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