$120+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — MIA
Jul 21 — Jul 281
Round-trip
1 adult, Economy
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Find cheap flights from Boston to Key Largo 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 Boston Logan Intl to Key Largo are usually found in September or October, booked 56 days in advance, depart on a Monday or Thursday and return on a Thursday
Cheap flight deals from Boston to Key Largo
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Best
Last-minute
One-way
Cheapest flights from Boston to Key LargoExplore 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 June 21, 2026.
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 June 21, 2026.
This American Airlines deal was found by Cheapflights users on 6/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2111:09 am
BOS
- MIA
Nonstop3h 34m
American Airlines
Sat 9/58:05 pm
MIA
- BOS
Nonstop3h 21m
American Airlines
Deal found 6/16![American Airlines logo]()
$232
This Delta deal was found by Cheapflights users on 6/16. 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.
Sun 8/237:00 am
BOS
- MIA
1 stop7h 24m
Delta
Wed 8/2611:50 am
MIA
- BOS
Nonstop3h 32m
Delta
Deal found 6/16![Delta logo]()
$233
This Trip.com deal was found by Cheapflights users on 6/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:12 am
BOS
- MIA
1 stop7h 19m
Frontier
Tue 8/2511:10 am
MIA
- BOS
1 stop14h 17m
Frontier
Deal found 6/16![Frontier logo]()
$236
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/145:00 am
BOS
- MIA
1 stop11h 10m
Southwest
Wed 8/1911:50 am
MIA
- BOS
1 stop6h 45m
Southwest
Deal found 6/16![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 6/16. 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.
Sat 8/226:05 am
BOS
- MIA
1 stop8h 16m
Delta
Tue 8/257:00 am
MIA
- BOS
1 stop6h 52m
Delta
Deal found 6/16![Delta logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 8/411:52 am
BOS
- MIA
1 stop11h 13m
Frontier
Fri 8/76:42 pm
MIA
- BOS
1 stop13h 00m
Frontier
Deal found 6/17![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 6/18. 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.
Mon 8/1711:59 am
BOS
- MIA
1 stop11h 07m
Frontier
Tue 8/255:28 pm
MIA
- BOS
1 stop18h 19m
Frontier
Deal found 6/18![Frontier logo]()
$240
This United Airlines deal was found by Cheapflights users on 6/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:00 pm
BOS
- MIA
1 stop5h 44m
United Airlines
Fri 9/43:57 pm
MIA
- BOS
1 stop9h 18m
United Airlines
Deal found 6/18![United Airlines logo]()
$241
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/145:00 am
BOS
- MIA
1 stop11h 10m
Southwest
Sun 8/235:50 am
MIA
- BOS
1 stop6h 05m
Southwest
Deal found 6/16![Southwest logo]()
$242
This Delta deal was found by Cheapflights users on 6/16. 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.
Tue 8/187:20 am
BOS
- MIA
Nonstop3h 32m
Delta
Fri 8/217:58 pm
MIA
- BOS
Nonstop3h 38m
Delta
Deal found 6/16![Delta logo]()
$243
This American Airlines deal was found by Cheapflights users on 6/20. 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.
Tue 8/185:18 pm
BOS
- MIA
Nonstop3h 41m
American Airlines
Tue 8/257:00 am
MIA
- BOS
1 stop4h 50m
American Airlines
Deal found 6/20![American Airlines logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/112:01 pm
BOS
- MIA
1 stop11h 02m
Frontier
Fri 7/108:30 am
MIA
- BOS
1 stop23h 12m
Frontier
Deal found 6/19![Frontier logo]()
$245
Best flights from Boston to Key LargoDiscover carefully curated flight deals from Boston to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 21, 2026.
Discover carefully curated flight deals from Boston to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 21, 2026.
This Delta deal was found by Cheapflights users on 6/19. 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.
Sat 9/195:40 pm
BOS
- MIA
1 stop7h 15m
Delta
Thu 9/243:35 pm
MIA
- BOS
1 stop5h 56m
Delta
Deal found 6/19![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/103:13 pm
BOS
- MIA
1 stop7h 14m
United Airlines
Mon 7/135:32 pm
MIA
- BOS
1 stop7h 42m
United Airlines
Deal found 6/16![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 6/17. 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 7/285:35 am
BOS
- MIA
2 stops10h 15m
Southwest
Fri 7/316:50 pm
MIA
- BOS
1 stop5h 20m
Southwest
Deal found 6/17![Southwest logo]()
$332
This Delta deal was found by Cheapflights users on 6/20. 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 7/297:05 am
BOS
- MIA
Nonstop3h 30m
Delta
Mon 8/37:58 pm
MIA
- BOS
Nonstop3h 38m
Delta
Deal found 6/20![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 6/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/205:44 pm
BOS
- MIA
1 stop5h 38m
United Airlines
Wed 7/228:48 am
MIA
- BOS
1 stop7h 50m
United Airlines
Deal found 6/20![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 6/19. 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.
Mon 8/107:20 am
BOS
- MIA
Nonstop3h 32m
Delta
Tue 8/1811:50 am
MIA
- BOS
Nonstop3h 32m
Delta
Deal found 6/19![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 6/17. 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.
Sat 7/45:15 am
BOS
- MIA
2 stops11h 20m
Southwest
Tue 8/49:15 am
MIA
- BOS
2 stops9h 20m
Southwest
Deal found 6/17![Southwest logo]()
$366
This Delta deal was found by Cheapflights users on 6/16. 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.
Tue 11/36:55 am
BOS
- MIA
1 stop6h 01m
Delta
Wed 11/187:00 am
MIA
- BOS
1 stop5h 39m
Delta
Deal found 6/16![Delta logo]()
$317
This Delta deal was found by Cheapflights users on 6/20. 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.
Mon 7/203:15 pm
BOS
- MIA
Nonstop3h 43m
Delta
Thu 7/2311:30 am
MIA
- BOS
Nonstop3h 29m
Delta
Deal found 6/20![Delta logo]()
$317
This Delta deal was found by Cheapflights users on 6/16. 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.
Thu 10/2912:00 pm
BOS
- MIA
1 stop7h 13m
Delta
Mon 11/25:55 pm
MIA
- BOS
1 stop5h 53m
Delta
Deal found 6/16![Delta logo]()
$337
This Delta deal was found by Cheapflights users on 6/16. 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.
Fri 10/25:00 pm
BOS
- MIA
1 stop6h 14m
Delta
Sun 10/47:00 am
MIA
- BOS
1 stop7h 24m
Delta
Deal found 6/16![Delta logo]()
$337
This Delta deal was found by Cheapflights users on 6/19. 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.
Fri 12/117:50 pm
BOS
- MIA
Nonstop3h 37m
Delta
Mon 12/141:45 pm
MIA
- BOS
1 stop7h 42m
Delta
Deal found 6/19![Delta logo]()
$337
Last-minute flights from Boston to Key LargoDiscover last-minute flight deals from Boston to Key Largo. Data last updated June 21, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Key Largo. Data last updated June 21, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 6/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:00 am
BOS
- MIA
1 stop7h 49m
Frontier
Tue 6/235:26 pm
MIA
- BOS
1 stop8h 01m
Frontier
Deal found 6/16![Frontier logo]()
$252
This deal was found by Cheapflights users on 6/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:00 am
BOS
- MIA
1 stop7h 49m
Frontier
Tue 9/15:26 pm
MIA
- BOS
1 stop8h 01m
Frontier
Deal found 6/17![Frontier logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/112:01 pm
BOS
- MIA
1 stop11h 02m
Frontier
Fri 7/108:30 am
MIA
- BOS
1 stop23h 12m
Frontier
Deal found 6/19![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/16:00 am
BOS
- MIA
1 stop7h 49m
Frontier
Tue 7/148:30 am
MIA
- BOS
1 stop23h 16m
Frontier
Deal found 6/18![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 7/46:00 am
BOS
- MIA
1 stop11h 56m
Frontier
Tue 7/75:28 pm
MIA
- BOS
1 stop14h 18m
Frontier
Deal found 6/20![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/911:52 am
BOS
- MIA
1 stop11h 13m
Frontier
Tue 7/145:28 pm
MIA
- BOS
1 stop14h 18m
Frontier
Deal found 6/18![Frontier logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/1112:56 pm
BOS
- MIA
1 stop7h 33m
Frontier
Tue 7/145:28 pm
MIA
- BOS
1 stop14h 18m
Frontier
Deal found 6/19![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 7/118:37 am
BOS
- MIA
2 stops11h 52m
Frontier
Tue 7/285:28 pm
MIA
- BOS
1 stop14h 18m
Frontier
Deal found 6/20![Frontier logo]()
$251
This Expedia deal was found by Cheapflights users on 6/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1611:52 am
BOS
- MIA
1 stop11h 13m
Frontier
Tue 8/113:07 pm
MIA
- BOS
1 stop19h 57m
Frontier
Deal found 6/16![Frontier logo]()
$242
This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1611:52 am
BOS
- MIA
1 stop11h 13m
Frontier
Tue 7/213:07 pm
MIA
- BOS
1 stop19h 57m
Frontier
Deal found 6/16![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 7/248:41 am
BOS
- MIA
1 stop11h 44m
Frontier
Tue 7/285:28 pm
MIA
- BOS
1 stop14h 18m
Frontier
Deal found 6/17![Frontier logo]()
$238
This Gotogate deal was found by Cheapflights users on 6/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:41 am
BOS
- MIA
1 stop11h 44m
Frontier
Fri 8/76:42 pm
MIA
- BOS
1 stop13h 00m
Frontier
Deal found 6/16![Frontier logo]()
$243
One-way flights from Boston to Key LargoSearch for one-way flight options from Boston to Key Largo. Find affordable one-way fares based on user searches. Data last updated June 21, 2026.
Search for one-way flight options from Boston to Key Largo. Find affordable one-way fares based on user searches. Data last updated June 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:41 am
BOS
- MIA
1 stop11h 49m
Frontier
Deal found 6/16![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 6/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:00 am
BOS
- MIA
1 stop7h 29m
Frontier
Deal found 6/16![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 6/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:00 am
BOS
- MIA
1 stop7h 49m
Frontier
Deal found 6/16![Frontier logo]()
$123
This Super.com deal was found by Cheapflights users on 6/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
BOS
- MIA
1 stop7h 49m
Frontier
Deal found 6/16![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 6/18. 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.
Thu 9/1711:28 am
BOS
- MIA
1 stop9h 36m
Frontier
Deal found 6/18![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 6/17. 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.
Fri 7/312:01 pm
BOS
- MIA
1 stop11h 02m
Frontier
Deal found 6/17![Frontier logo]()
$128
This iWofly deal was found by Cheapflights users on 6/20. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:41 am
BOS
- MIA
1 stop11h 49m
Frontier
Deal found 6/20![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/88:41 am
BOS
- MIA
1 stop11h 49m
Frontier
Deal found 6/19![Frontier logo]()
$131
This Orbitz deal was found by Cheapflights users on 6/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1512:56 pm
BOS
- MIA
1 stop7h 33m
Frontier
Deal found 6/18![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 10/1511:28 am
BOS
- MIA
1 stop6h 54m
Frontier
Deal found 6/17![Frontier logo]()
$133
Find 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 June 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $232 (American Airlines) |
One-way from | $120 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $373 |
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 June 21, 2026.
Use the filters below to find and compare flights from Boston to Key Largo that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Sat 9/19
5:40 pm-12:55 am
1 stop7h 15m
Miami
Thu 9/24
3:35 pm-9:31 pm
1 stop5h 56m
$257
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Fri 7/10
3:13 pm-10:27 pm
1 stop7h 14m
Miami
Mon 7/13
5:32 pm-1:14 am
1 stop7h 42m
$297
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Wed 7/29
7:05 am-10:35 am
Nonstop3h 30m
Miami
Mon 8/3
7:58 pm-11:36 pm
Nonstop3h 38m
$302
Quickest round-trip
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Mon 8/10
7:20 am-10:52 am
Nonstop3h 32m
Miami
Tue 8/18
11:50 am-3:22 pm
Nonstop3h 32m
$307
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Tue 11/3
6:55 am-12:56 pm
1 stop6h 01m
Miami
Wed 11/18
7:00 am-12:39 pm
1 stop5h 39m
$317
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Mon 7/20
3:15 pm-6:58 pm
Nonstop3h 43m
Miami
Thu 7/23
11:30 am-2:59 pm
Nonstop3h 29m
$317
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Tue 7/28
5:35 am-3:50 pm
2 stops10h 15m
Miami
Fri 7/31
6:50 pm-12:10 am
1 stop5h 20m
$332
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Mon 7/20
5:44 pm-11:22 pm
1 stop5h 38m
Miami
Wed 7/22
8:48 am-4:38 pm
1 stop7h 50m
$337
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Thu 10/29
12:00 pm-7:13 pm
1 stop7h 13m
Miami
Mon 11/2
5:55 pm-11:48 pm
1 stop5h 53m
$337
BostonMiami
BOS - MIA
BOSMIA
Boston Logan Intl
Fri 10/2
5:00 pm-11:14 pm
1 stop6h 14m
Miami
Sun 10/4
7:00 am-2:24 pm
1 stop7h 24m
$337
Showing 1-10 of 22 resultsSorted by cheapest first
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.
BOS-MIA
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
BOS-KE9
BOS-MIA
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 June 21, 2026.
It’s typically best to fly out from Boston to Key Largo in the evening. Doing so could potentially save you 36% on the flight price compared to flying at noon, which is usually more expensive.
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 June 21, 2026.
The most flights from BOS to KE9 are scheduled on a Sunday (30 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from Boston to Key Largo?
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 June 13, 2026.
Travelers seeking maximum savings on their Boston to Key Largo flight should consider departing on Monday at noon when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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 June 21, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andAmerican 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.
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Boarding
8.1
Crew
8.6
Overall
7.9
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
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.
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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Boston to Key Largo
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Key Largo by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Boston to Key Largo by cabin class
Find flights from Boston to Key Largo, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Boston and Key Largo flights
Browse other Boston and Key Largo flight options. Last updated on June 21, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on June 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Boston to Key Largo flights
Consider these flights traveling from Boston to Key Largo.
Top 7 airlines flying from Boston to Key Largo
Discover the top 7 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 June 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$50 | Average$241 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$59 | Average$88 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$111 | Average$318 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$355 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$153 | Average$315 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$166 | Average$374 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$177 | Average$414 | FlexibilityNo cancel fee | On-time63% |