$189+ Cheap flights from Seattle (SEA) 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — MIA
Aug 31 — Sep 71
Round-trip
1 adult, Economy
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Find cheap flights from Seattle 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 Seattle/Tacoma Intl to Key Largo are usually found in October or March, booked 82 days in advance, depart on a Thursday or Tuesday and return on a Wednesday
Cheap flight deals from Seattle to Key Largo
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to Key LargoExplore the most affordable flight options available from Seattle to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.
Explore the most affordable flight options available from Seattle to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.
This Expedia deal was found by Cheapflights users on 7/31. 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.
Fri 8/287:06 pm
SEA
- MIA
1 stop30h 46m
Frontier
Fri 9/46:00 am
MIA
- SEA
1 stop30h 19m
Frontier
Deal found 7/31![Frontier logo]()
$318
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/257:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Tue 9/86:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/31![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 9/57:06 pm
SEA
- MIA
2 stops25h 49m
Frontier
Wed 9/165:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/30![Frontier logo]()
$320
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Wed 9/26:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/27![Frontier logo]()
$321
This Frontier deal was found by Cheapflights users on 7/30. 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.
Wed 9/22:37 pm
SEA
- MIA
1 stop11h 15m
Frontier
Sat 9/125:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/30![Frontier logo]()
$322
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:15 pm
SEA
- MIA
2 stops11h 15m
Frontier
Tue 9/155:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/29![Frontier logo]()
$323
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/97:25 pm
SEA
- MIA
2 stops16h 59m
Frontier
Wed 9/165:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/27![Frontier logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/297:06 pm
SEA
- MIA
2 stops15h 26m
Frontier
Sat 9/125:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/31![Frontier logo]()
$325
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:06 pm
SEA
- MIA
1 stop30h 46m
Frontier
Wed 8/268:00 am
MIA
- SEA
2 stops28h 19m
Frontier
Deal found 7/29![Frontier logo]()
$326
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Mon 8/316:00 am
MIA
- SEA
1 stop9h 20m
Frontier
Deal found 7/27![Frontier logo]()
$327
This CheapOair deal was found by Cheapflights users on 7/30. 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 8/211:35 pm
SEA
- MIA
1 stop12h 17m
Frontier
Fri 8/286:00 am
MIA
- SEA
1 stop30h 19m
Frontier
Deal found 7/30![Frontier logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 9/108:15 pm
SEA
- MIA
2 stops18h 44m
Frontier
Sun 9/135:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/30![Frontier logo]()
$329
Best flights from Seattle to Key LargoDiscover carefully curated flight deals from Seattle to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 1, 2026.
Discover carefully curated flight deals from Seattle to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 1, 2026.
This Delta deal was found by Cheapflights users on 7/31. 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 8/318:05 am
SEA
- MIA
Nonstop6h 06m
Delta
Sun 9/136:19 pm
MIA
- SEA
Nonstop6h 36m
Delta
Deal found 7/31![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 7/31. 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 11/106:10 am
SEA
- MIA
1 stop7h 40m
Southwest
Tue 11/179:10 am
MIA
- SEA
2 stops11h 40m
Southwest
Deal found 7/31![Southwest logo]()
$372
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:13 am
SEA
- MIA
Nonstop6h 06m
Alaska Airlines
Mon 8/316:22 pm
MIA
- SEA
Nonstop6h 38m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$437
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:59 am
SEA
- MIA
Nonstop6h 08m
Delta
Mon 10/126:15 pm
MIA
- SEA
Nonstop6h 45m
Delta
Deal found 7/27![Delta logo]()
$347
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.
Sun 9/67:59 am
SEA
- MIA
Nonstop6h 06m
Delta
Sun 9/136:19 pm
MIA
- SEA
Nonstop6h 36m
Delta
Deal found 7/28![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 7/31. 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 12/26:10 am
SEA
- MIA
2 stops10h 55m
Southwest
Tue 12/159:10 am
MIA
- SEA
2 stops11h 40m
Southwest
Deal found 7/31![Southwest logo]()
$431
This Delta deal was found by Cheapflights users on 7/31. 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 8/278:05 am
SEA
- MIA
Nonstop6h 06m
Delta
Wed 9/96:19 pm
MIA
- SEA
Nonstop6h 36m
Delta
Deal found 7/31![Delta logo]()
$392
This Southwest deal was found by Cheapflights users on 7/31. 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.
Sun 1/246:35 am
SEA
- MIA
2 stops11h 20m
Southwest
Sun 1/317:00 am
MIA
- SEA
1 stop9h 00m
Southwest
Deal found 7/31![Southwest logo]()
$462
This Southwest deal was found by Cheapflights users on 7/31. 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.
Thu 1/710:45 am
SEA
- MIA
1 stop7h 55m
Southwest
Thu 1/146:40 am
MIA
- SEA
2 stops13h 25m
Southwest
Deal found 7/31![Southwest logo]()
$462
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/148:10 am
SEA
- MIA
Nonstop5h 56m
Delta
Thu 1/146:05 pm
MIA
- SEA
Nonstop6h 53m
Delta
Deal found 7/29![Delta logo]()
$432
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1111:05 pm
SEA
- MIA
2 stops11h 30m
Southwest
Fri 9/183:20 pm
MIA
- SEA
2 stops10h 40m
Southwest
Deal found 7/28![Southwest logo]()
$470
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.
Mon 11/98:10 am
SEA
- MIA
Nonstop5h 56m
Delta
Sat 11/146:00 am
MIA
- SEA
1 stop11h 37m
Delta
Deal found 7/28![Delta logo]()
$462
Last-minute flights from Seattle to Key LargoDiscover last-minute flight deals from Seattle to Key Largo. Data last updated August 1, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Key Largo. Data last updated August 1, 2026 and is based on user searches.
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:13 pm
SEA
- MIA
1 stop31h 17m
Frontier
Tue 9/16:00 am
MIA
- SEA
1 stop30h 19m
Frontier
Deal found 7/27![Frontier logo]()
$324
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.
Wed 8/122:22 pm
SEA
- MIA
1 stop12h 29m
Frontier
Sat 8/226:00 am
MIA
- SEA
1 stop30h 19m
Frontier
Deal found 7/29![Frontier logo]()
$320
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:06 pm
SEA
- MIA
1 stop7h 45m
Frontier
Sat 8/156:00 am
MIA
- SEA
1 stop10h 17m
Frontier
Deal found 7/29![Frontier logo]()
$322
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:06 pm
SEA
- MIA
1 stop30h 46m
Frontier
Wed 8/268:00 am
MIA
- SEA
2 stops28h 19m
Frontier
Deal found 7/29![Frontier logo]()
$326
This CheapOair deal was found by Cheapflights users on 7/30. 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 8/217:06 pm
SEA
- MIA
1 stop30h 46m
Frontier
Thu 8/276:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/30![Frontier logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/249:29 pm
SEA
- MIA
2 stops22h 36m
Frontier
Mon 8/316:00 am
MIA
- SEA
1 stop9h 20m
Frontier
Deal found 7/31![Frontier logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/257:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Tue 9/86:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/31![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/257:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Tue 9/16:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/31![Frontier logo]()
$323
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Wed 9/26:00 am
MIA
- SEA
1 stop10h 22m
Frontier
Deal found 7/27![Frontier logo]()
$321
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:06 pm
SEA
- MIA
2 stops24h 59m
Frontier
Mon 8/316:00 am
MIA
- SEA
1 stop9h 20m
Frontier
Deal found 7/27![Frontier logo]()
$327
This Expedia deal was found by Cheapflights users on 7/31. 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.
Fri 8/287:06 pm
SEA
- MIA
1 stop30h 46m
Frontier
Fri 9/46:00 am
MIA
- SEA
1 stop30h 19m
Frontier
Deal found 7/31![Frontier logo]()
$318
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/297:06 pm
SEA
- MIA
2 stops15h 26m
Frontier
Sat 9/125:50 am
MIA
- SEA
1 stop12h 18m
Frontier
Deal found 7/31![Frontier logo]()
$325
One-way flights from Seattle to Key LargoSearch for one-way flight options from Seattle to Key Largo. Find affordable one-way fares based on user searches. Data last updated August 1, 2026.
Search for one-way flight options from Seattle to Key Largo. Find affordable one-way fares based on user searches. Data last updated August 1, 2026.
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:27 pm
SEA
- MIA
1 stop29h 19m
Frontier
Deal found 7/28![Frontier logo]()
$189
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Sun 8/168:53 pm
SEA
- MIA
1 stop30h 37m
Frontier
Deal found 7/30![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 8/272:37 pm
SEA
- MIA
1 stop11h 15m
Frontier
Deal found 7/30![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Wed 9/27:06 pm
SEA
- MIA
2 stops21h 39m
Frontier
Deal found 8/1![Frontier logo]()
$192
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/177:06 pm
SEA
- MIA
1 stop7h 45m
Frontier
Deal found 7/28![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 10/267:41 pm
SEA
- MIA
1 stop31h 07m
Frontier
Deal found 7/30![Frontier logo]()
$195
This Super.com deal was found by Cheapflights users on 7/30. 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.
Thu 8/202:37 pm
SEA
- MIA
1 stop11h 15m
Frontier
Deal found 7/30![Frontier logo]()
$196
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:13 pm
SEA
- MIA
1 stop31h 17m
Frontier
Deal found 7/28![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Sun 8/237:06 pm
SEA
- MIA
2 stops40h 27m
Frontier
Deal found 7/30![Frontier logo]()
$199
This Booking.com deal was found by Cheapflights users on 7/30. 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 8/138:53 pm
SEA
- MIA
1 stop30h 37m
Frontier
Deal found 7/30![Frontier logo]()
$200
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:50 pm
SEA
- MIA
Nonstop5h 50m
American Airlines
Deal found 7/27![American Airlines logo]()
$201
Find flight deals from Seattle to Key Largo
Keep the following information in mind while searching for Seattle to Key Largo flight deals. Data was last updated August 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $318 (Expedia) |
One-way from | $189 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $374 |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle 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 August 1, 2026.
Use the filters below to find and compare flights from Seattle to Key Largo that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Mon 8/31
8:05 am-5:11 pm
Nonstop6h 06m
Miami
Sun 9/13
6:19 pm-9:55 pm
Nonstop6h 36m
$347
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Sat 9/19
7:59 am-5:07 pm
Nonstop6h 08m
Miami
Mon 10/12
6:15 pm-10:00 pm
Nonstop6h 45m
$347
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Sun 9/6
7:59 am-5:05 pm
Nonstop6h 06m
Miami
Sun 9/13
6:19 pm-9:55 pm
Nonstop6h 36m
$347
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Tue 11/10
6:10 am-4:50 pm
1 stop7h 40m
Miami
Tue 11/17
9:10 am-5:50 pm
2 stops11h 40m
$372
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Thu 8/27
8:05 am-5:11 pm
Nonstop6h 06m
Miami
Wed 9/9
6:19 pm-9:55 pm
Nonstop6h 36m
$392
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Wed 12/2
6:10 am-8:05 pm
2 stops10h 55m
Miami
Tue 12/15
9:10 am-5:50 pm
2 stops11h 40m
$431
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Mon 12/14
8:10 am-5:06 pm
Nonstop5h 56m
Miami
Thu 1/14
6:05 pm-9:58 pm
Nonstop6h 53m
$432
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Thu 8/27
8:13 am-5:19 pm
Nonstop6h 06m
Miami
Mon 8/31
6:22 pm-10:00 pm
Nonstop6h 38m
$437
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Sun 1/24
6:35 am-8:55 pm
2 stops11h 20m
Miami
Sun 1/31
7:00 am-1:00 pm
1 stop9h 00m
$462
SeattleMiami
SEA - MIA
SEAMIA
Seattle/Tacoma Intl
Thu 1/7
10:45 am-9:40 pm
1 stop7h 55m
Miami
Thu 1/14
6:40 am-5:05 pm
2 stops13h 25m
$462
Showing 1-10 of 24 resultsSorted by cheapest first
Best time to book a flight from Seattle to Key Largo
Have a flexible travel schedule? Discover the best time to fly to Key Largo from Seattle with our price prediction graph.
SEA-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 Seattle to Key Largo
SEA-KE9
SEA-MIA
What is the cheapest time of day to fly from SEA to KE9?
Find hourly flight availability from Seattle 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 August 1, 2026.
When flying from Seattle 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.
Weekly flight availability from Seattle to Key Largo
Explore weekly flight availability from Seattle 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 August 1, 2026.
The most flights from SEA to KE9 are scheduled on a Thursday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from Seattle to Key Largo?
Airfare is typical for this route at the moment.
Seattle to Key Largo flights typically cost between $317 and $467 in August.The cheapest round-trip price found within the last 5 days was $318 on Frontier (Aug 28-Sep 4).
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 August 1, 2026.
See what other customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Seattle to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Overall
7.9
Food
7.0
Crew
8.5
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Related info for your journey
Find useful and relevant information for your journey from Seattle 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 Seattle 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 Seattle to Key Largo by cabin class
Find flights from Seattle to Key Largo, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Key Largo flights
Browse other Seattle and Key Largo flight options. Last updated on August 1, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on August 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Seattle to Key Largo flights
Consider these flights traveling from Seattle to Key Largo.
Top 8 airlines flying from Seattle to Key Largo
Discover the top 8 airlines that operate flights from Seattle 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 August 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$378 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$143 | Average$297 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$159 | Average$474 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$398 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$199 | Average$474 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$487 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$523 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$258 | Average$331 | FlexibilityNo cancel fee | On-time62% |