$171+ Cheap flights from Seattle (SEA) to Key Largo, FL
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — MIA
Oct 17 — Oct 241
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 March or February, booked 29 days in advance, depart on a Tuesday or Thursday 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 September 17, 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 September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/15. 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 12/96:30 am -
2 stops12h 40m
Sat 12/126:20 am -
2 stops12h 45m
Deal found 9/15![Southwest logo]()
$336
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 10/128:39 pm -
Nonstop5h 43m
Mon 10/198:15 pm -
Nonstop6h 44m
Deal found 9/15![American Airlines logo]()
$337
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sat 12/55:25 pm -
1 stop8h 54m
Mon 12/146:40 am -
1 stop12h 26m
Deal found 9/14![Frontier logo]()
$338
This Delta deal was found by Cheapflights users on 9/15. 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 12/255:15 am -
2 stops14h 28m
Wed 1/611:35 am -
1 stop13h 27m
Deal found 9/15![Delta logo]()
$341
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/225:40 pm -
1 stop9h 48m
Fri 11/276:17 pm -
Nonstop6h 48m
Deal found 9/17![Delta logo]()
$342
This Frontier deal was found by Cheapflights users on 9/16. 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.
Wed 12/25:25 pm -
1 stop8h 54m
Wed 12/166:40 am -
1 stop12h 26m
Deal found 9/16![Frontier logo]()
$343
This Mytrip deal was found by Cheapflights users on 9/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:00 pm -
2 stops25h 47m
Tue 10/2010:36 pm -
2 stops19h 36m
Deal found 9/17![Frontier logo]()
$345
This Trip.com deal was found by Cheapflights users on 9/15. 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.
Fri 10/164:27 pm -
1 stop29h 20m
Fri 10/235:50 am -
1 stop12h 22m
Deal found 9/15![Frontier logo]()
$346
This Delta deal was found by Cheapflights users on 9/16. 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 11/38:05 am -
Nonstop5h 58m
Fri 11/610:36 am -
1 stop11h 28m
Deal found 9/16![Delta logo]()
$347
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:27 pm -
1 stop29h 20m
Sat 10/315:50 am -
1 stop12h 22m
Deal found 9/13![Frontier logo]()
$348
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:00 pm -
2 stops25h 47m
Mon 10/1910:55 pm -
2 stops19h 17m
Deal found 9/16![Frontier logo]()
$349
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:25 pm -
1 stop8h 54m
Sat 12/126:40 am -
1 stop12h 26m
Deal found 9/13![Frontier logo]()
$350
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 September 17, 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 September 17, 2026.
This Delta deal was found by Cheapflights users on 9/16. 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 1/228:25 am -
Nonstop6h 02m
Tue 2/26:05 pm -
Nonstop6h 53m
Deal found 9/16![Delta logo]()
$352
This Southwest deal was found by Cheapflights users on 9/13. 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 10/2712:10 am -
2 stops14h 20m
Wed 11/412:00 pm -
2 stops13h 20m
Deal found 9/13![Southwest logo]()
$397
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 12/88:24 am -
Nonstop5h 54m
Tue 12/226:11 pm -
Nonstop7h 03m
Deal found 9/15![Alaska Airlines logo]()
$412
This United Airlines deal was found by Cheapflights users on 9/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/147:00 am -
1 stop8h 15m
Mon 12/219:00 am -
1 stop10h 19m
Deal found 9/13![United Airlines logo]()
$427
This Delta deal was found by Cheapflights users on 9/15. 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 11/48:05 am -
Nonstop5h 58m
Mon 11/96:17 pm -
Nonstop6h 48m
Deal found 9/15![Delta logo]()
$352
This Southwest deal was found by Cheapflights users on 9/14. 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 11/205:15 am -
2 stops15h 35m
Thu 11/2610:25 am -
2 stops10h 15m
Deal found 9/14![Southwest logo]()
$442
This Delta deal was found by Cheapflights users on 9/14. 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 12/98:10 am -
Nonstop5h 52m
Wed 12/236:02 pm -
Nonstop6h 57m
Deal found 9/14![Delta logo]()
$412
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/1511:59 pm -
1 stop8h 34m
Sun 11/227:02 am -
2 stops16h 54m
Deal found 9/16![United Airlines logo]()
$467
This Delta deal was found by Cheapflights users on 9/15. 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 10/2311:50 pm -
1 stop10h 35m
Tue 10/276:15 pm -
Nonstop6h 45m
Deal found 9/15![Delta logo]()
$427
This Delta deal was found by Cheapflights users on 9/14. 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 1/2412:00 pm -
2 stops15h 15m
Fri 2/126:05 pm -
Nonstop6h 53m
Deal found 9/14![Delta logo]()
$490
This Delta deal was found by Cheapflights users on 9/14. 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 12/68:10 am -
Nonstop5h 52m
Tue 12/226:43 pm -
1 stop8h 32m
Deal found 9/14![Delta logo]()
$497
This Delta deal was found by Cheapflights users on 9/13. 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 10/86:00 am -
1 stop8h 46m
Mon 10/126:15 pm -
Nonstop6h 45m
Deal found 9/13![Delta logo]()
$507
Last-minute flights from Seattle to Key LargoDiscover last-minute flight deals from Seattle to Key Largo. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Key Largo. Data last updated September 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 10/128:39 pm -
Nonstop5h 43m
Mon 10/198:15 pm -
Nonstop6h 44m
Deal found 9/15![American Airlines logo]()
$337
This Mytrip deal was found by Cheapflights users on 9/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:00 pm -
2 stops25h 47m
Tue 10/2010:36 pm -
2 stops19h 36m
Deal found 9/17![Frontier logo]()
$345
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:00 pm -
2 stops25h 47m
Mon 10/1910:55 pm -
2 stops19h 17m
Deal found 9/16![Frontier logo]()
$349
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:16 pm -
2 stops17h 16m
Sat 10/245:50 am -
1 stop12h 22m
Deal found 9/16![Frontier logo]()
$347
This Trip.com deal was found by Cheapflights users on 9/15. 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.
Fri 10/164:27 pm -
1 stop29h 20m
Fri 10/235:50 am -
1 stop12h 22m
Deal found 9/15![Frontier logo]()
$346
This Southwest deal was found by Cheapflights users on 9/14. 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 10/1712:10 am -
1 stop8h 45m
Wed 10/2111:30 am -
1 stop9h 35m
Deal found 9/14![Southwest logo]()
$351
This Delta deal was found by Cheapflights users on 9/16. 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 10/178:05 am -
Nonstop5h 58m
Sat 10/246:15 pm -
Nonstop6h 45m
Deal found 9/16![Delta logo]()
$352
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Tue 10/204:27 pm -
2 stops38h 48m
Sat 10/245:50 am -
1 stop12h 22m
Deal found 9/15![Frontier logo]()
$338
This Delta deal was found by Cheapflights users on 9/15. 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 10/2010:37 am -
2 stops16h 45m
Fri 10/308:10 am -
1 stop9h 09m
Deal found 9/15![Delta logo]()
$355
This CheapOair deal was found by Cheapflights users on 9/15. 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 10/214:27 pm -
1 stop29h 20m
Tue 10/2710:36 pm -
2 stops19h 36m
Deal found 9/15![Frontier logo]()
$342
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:27 pm -
1 stop29h 20m
Sat 10/315:50 am -
1 stop12h 22m
Deal found 9/13![Frontier logo]()
$348
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 September 17, 2026.
Search for one-way flight options from Seattle to Key Largo. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Tue 11/178:09 pm -
2 stops25h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$171
This Super.com deal was found by Cheapflights users on 9/15. 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 10/314:27 pm -
1 stop30h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$173
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/58:15 pm -
2 stops25h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 12/39:53 pm -
2 stops33h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Fri 11/134:27 pm -
1 stop29h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/164:27 pm -
1 stop29h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Sat 12/124:58 pm -
1 stop9h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$178
This Delta deal was found by Cheapflights users on 9/16. 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 10/117:15 am -
1 stop12h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Sat 11/144:27 pm -
1 stop29h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:00 pm -
2 stops25h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/138:00 pm -
2 stops25h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$189
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 September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $336 (Southwest) |
One-way from | $171 (Kiwi.com) |
Popular in | December |
Cheapest in | March |
Average price | $407 |
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 7,457,451 searches. Data last updated September 17, 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
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Mon 12/14
7:54 pm-6:27 am
1 stop7h 33m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$179
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Thu 12/3
7:00 am-6:50 pm
1 stop8h 50m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$224
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Fri 11/6
5:15 am-11:50 pm
2 stops15h 35m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$225
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Sat 1/2
6:28 pm-7:00 pm
1 stop21h 32m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$228
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Mon 3/15
12:10 am-11:55 am
1 stop8h 45m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$229
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Tue 3/16
8:25 am-5:27 pm
Nonstop6h 02m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$249
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Sun 3/14
8:25 am-5:27 pm
Nonstop6h 02m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$249
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Sat 10/10
8:05 am-5:03 pm
Nonstop5h 58m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$249
Quickest round-trip
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Thu 12/31
8:00 am-4:52 pm
Nonstop5h 52m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$249
SeattleMiami
SEA Seattle/Tacoma Intl - MIA Miami
SEAMIA
Seattle/Tacoma Intl
Sat 12/19
5:35 pm-7:51 am
1 stop11h 16m
Miami
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$259
Showing 1-10 of 23 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 September 17, 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 September 17, 2026.
The most flights from SEA to KE9 are scheduled on a Wednesday (3 on average). You will have fewer flight options on Monday, 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 below average for this route at the moment.
Seattle to Key Largo flights typically cost between $337 and $501 in December.The cheapest round-trip price found within the last 5 days was $336 on Southwest (Dec 9-Dec 12).
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 September 17, 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.
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
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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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 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$143 | Average$316 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$159 | Average$501 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$422 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$199 | Average$471 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$502 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$258 | Average$331 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$323 | Average$515 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$335 | Average$488 | FlexibilityNo cancel fee | On-time85% |