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Key Largo

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

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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — MIA
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Key Largo are usually found in September or January, booked 30 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Boston to Key Largo

Keep the following information in mind while searching for Boston to Key Largo flight deals. Data was last updated July 29, 2025.

Round-trip from

$119
(Booking.com)

One-way from

$69
(Delta)

Popular in

April

Cheapest in

September

Average price

$247
From Boston Logan Intl to Key Largo
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One-way flight from Boston Logan Intl to Key Largo
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Highest demand for flights based on searches. 2% potential increase in price ($5 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Boston to Key Largo

Cheapest flights from Boston to Key Largo
Explore the most affordable flight options available from Boston to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Booking.com deal was found by Cheapflights users on 7/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/112:18 pmBOS - MIA
Nonstop3h 32mSpirit Airlines
Thu 9/189:56 amMIA - BOS
Nonstop3h 27mSpirit Airlines
Deal found 7/28$119
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Sat 9/137:36 amBOS - MIA
Nonstop3h 37mAmerican Airlines
Tue 9/165:00 pmMIA - BOS
Nonstop3h 14mAmerican Airlines
Deal found 7/26$120
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:35 amBOS - MIA
1 stop7h 58mDelta
Wed 9/177:59 pmMIA - BOS
Nonstop3h 27mDelta
Deal found 7/28$127
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:25 amBOS - MIA
Nonstop3h 36mFrontier
Sun 11/167:05 amMIA - BOS
Nonstop3h 25mFrontier
Deal found 7/27$129
This CheapOair deal was found by Cheapflights users on 7/29. 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 10/174:59 pmBOS - MIA
Nonstop3h 36mMultiple Airlines
Sun 10/197:05 amMIA - BOS
Nonstop3h 25mMultiple Airlines
Deal found 7/29$140
This Southwest deal was found by Cheapflights users on 7/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/55:30 amBOS - MIA
1 stop7h 35mSouthwest
Sun 11/96:00 amMIA - BOS
1 stop5h 45mSouthwest
Deal found 7/27$165

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Key Largo 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 29, 2025.
Use the filters below to find and compare flights from Boston to Key Largo that are best for you.

Fly from

Boston

Fly to

Key Largo

Route

Depart

Return

Price

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Thu 9/11

2:18 pm-5:50 pm

Nonstop3h 32m

Miami

Thu 9/18

9:56 am-1:23 pm

Nonstop3h 27m

$119

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Sat 9/13

7:36 am-11:13 am

Nonstop3h 37m

Miami

Tue 9/16

5:00 pm-8:14 pm

Nonstop3h 14m

$120

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Wed 9/10

5:35 am-1:33 pm

1 stop7h 58m

Miami

Wed 9/17

7:59 pm-11:26 pm

Nonstop3h 27m

$127

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Thu 11/6

11:25 am-3:01 pm

Nonstop3h 36m

Miami

Sun 11/16

7:05 am-10:30 am

Nonstop3h 25m

$129

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Fri 10/17

4:59 pm-8:35 pm

Nonstop3h 36m

Miami

Sun 10/19

7:05 am-10:30 am

Nonstop3h 25m

$140

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Sat 9/6

2:55 pm-8:35 pm

1 stop5h 40m

Miami

Mon 9/8

12:35 pm-8:05 pm

1 stop7h 30m

$162

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Wed 9/17

5:25 pm-12:23 am

1 stop6h 58m

$69

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Thu 10/9

11:25 am-3:01 pm

Nonstop3h 36m

$73

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Sun 9/14

2:18 pm-5:50 pm

Nonstop3h 32m

$74

BostonMiami

BOS - MIA

BOSMIA

Boston Logan Intl

Sat 9/6

9:15 am-4:10 pm

1 stop6h 55m

$79

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 12 results
1
2

Best time to book a flight from Boston to Key Largo

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

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

Use this chart to determine the optimal time to book a round-trip flight from Boston to Key Largo. Price data was last updated on July 25, 2025.

The price you pay for your flight from Boston to Key Largo may vary depending on when you book. For the best chance of a lower fare, look to book 30 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 Boston to Key Largo?

Currently, September is the cheapest month in which you can book a flight from Boston to Key Largo (average of $232). Flying from Boston to Key Largo in March is currently the most expensive (average of $289). 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 BOS to KE9?

Find hourly flight availability from Boston to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

When flying from Boston to Key Largo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Use this chart to determine the cheapest time to fly round-trip from Boston to Key Largo. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Boston to Key Largo

Explore weekly flight availability from Boston to Key Largo. 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 29, 2025.

The most flights from BOS to KE9 are scheduled on a Monday (32 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (16 on average).

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated July 29, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Boston to Key Largo by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,979 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,044 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

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

    If you book a flight to Key Largo from Boston, you will be flying from Logan Intl, which is the city’s only airport. Boston Logan Intl (BOS) is located 2.6 mi from the center of Boston. There are 22 flights from Logan Intl to Key Largo per day from 8 different airlines.

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

    The Boston Logan Intl to Key Largo flight path was viewed by 150 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    $69 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Frontier and Spirit Airlines, with prices starting from $73 and $74, respectively.

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

    Before booking your flight to Key Largo from Boston, check out the most reliable airlines to get you to your destination on time: Japan Airlines (92%), Spirit Airlines (87%), American Airlines( 75%).

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

    The cheapest flight price from Boston to Key Largo is $78. On average you can expect to pay $867. The most popular route, (Boston Logan Intl - Miami), can usually be booked for $100.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Boston to Key Largo (average of $232). Flying from Boston to Key Largo in March is currently the most expensive (average of $289). 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.

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Top 8 airlines flying from Boston to Key Largo

Discover the top 8 airlines that operate flights from Boston to Key Largo. 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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$123FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$58Average$149FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$84Average$348FlexibilityNo cancel feeOn-time62%
DeltaCheapest$89Average$273FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$138Average$359FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$145Average$335FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$156Average$459FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$166Average$257FlexibilityNo cancel feeOn-time75%

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