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Key Largo

$149+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — MIA
Jun 6 — Jun 131
Sat 6/6
Sat 6/13
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Key Largo are usually found in September or October, booked 33 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap flight deals from Seattle to Key Largo

Cheapest flights from Seattle to Key Largo
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 May 7, 2026.

This Expedia deal was found by Cheapflights users on 5/5. 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 8/193:19 pm
SEA
-
MIA
1 stop11h 35m
Frontier
Sun 8/238:18 pm
MIA
-
SEA
1 stop17h 17m
Frontier
Deal found 5/5$230
This Delta deal was found by Cheapflights users on 5/6. 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 5/287:50 am
SEA
-
MIA
Nonstop6h 00m
Delta
Wed 6/35:37 pm
MIA
-
SEA
Nonstop6h 48m
Delta
Deal found 5/6$237
This Flightnetwork deal was found by Cheapflights users on 5/5. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:50 pm
SEA
-
MIA
1 stop30h 43m
Frontier
Wed 6/36:30 am
MIA
-
SEA
1 stop30h 36m
Frontier
Deal found 5/5$242
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 8/193:19 pm
SEA
-
MIA
1 stop11h 35m
Frontier
Sat 8/228:18 pm
MIA
-
SEA
1 stop17h 17m
Frontier
Deal found 5/4$243
This eDestinos deal was found by Cheapflights users on 5/4. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:50 pm
SEA
-
MIA
1 stop30h 43m
Frontier
Sun 5/318:03 pm
MIA
-
SEA
1 stop17h 33m
Frontier
Deal found 5/4$244
This Frontier deal was found by Cheapflights users on 5/3. 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 8/63:34 pm
SEA
-
MIA
1 stop11h 17m
Frontier
Mon 8/1010:06 pm
MIA
-
SEA
1 stop15h 33m
Frontier
Deal found 5/3$245
This Delta deal was found by Cheapflights users on 5/5. 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 5/285:30 am
SEA
-
MIA
1 stop9h 11m
Delta
Tue 6/25:37 pm
MIA
-
SEA
Nonstop6h 48m
Delta
Deal found 5/5$247
This Expedia deal was found by Cheapflights users on 5/6. 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 7/303:34 pm
SEA
-
MIA
1 stop11h 17m
Frontier
Sun 8/96:00 am
MIA
-
SEA
1 stop11h 19m
Frontier
Deal found 5/6$250
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 8/188:13 pm
SEA
-
MIA
1 stop8h 03m
Frontier
Mon 8/248:18 pm
MIA
-
SEA
1 stop17h 17m
Frontier
Deal found 5/4$257
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 5/283:19 pm
SEA
-
MIA
1 stop11h 14m
Frontier
Fri 6/56:30 am
MIA
-
SEA
1 stop10h 31m
Frontier
Deal found 5/5$258

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 May 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$230
(Frontier)

One-way from

$149
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$377
Provider with most accurate pricing for Seattle/Tacoma Intl-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Miami flights.
Search Deals
From Seattle/Tacoma Intl to Key Largo
Search Deals
One-way flight from Seattle/Tacoma Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($53 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 7, 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

Price

Cheapest round-trip

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Thu 5/28

5:30 am-5:41 pm

1 stop9h 11m

Miami

Wed 6/3

7:39 am-3:05 pm

1 stop10h 26m

$257

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Sun 5/24

11:20 pm-11:35 am

1 stop9h 15m

Miami

Tue 6/2

12:30 pm-7:05 pm

1 stop9h 35m

$337

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 5/20

11:30 am-12:47 am

1 stop10h 17m

Miami

Wed 5/27

6:05 pm-9:55 pm

Nonstop6h 50m

$377

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Sat 5/23

11:30 am-12:43 am

1 stop10h 13m

Miami

Tue 5/26

6:05 pm-9:55 pm

Nonstop6h 50m

$377

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 6/30

5:15 am-5:15 pm

1 stop9h 00m

Miami

Tue 7/7

3:05 pm-11:30 pm

2 stops11h 25m

$396
Quickest round-trip

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Thu 6/11

8:25 am-5:31 pm

Nonstop6h 06m

Miami

Fri 6/26

6:30 am-10:00 am

Nonstop6h 30m

$397

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 7/22

11:05 pm-4:25 pm

2 stops14h 20m

Miami

Wed 7/29

3:05 pm-11:30 pm

2 stops11h 25m

$407

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 6/16

8:12 am-5:17 pm

Nonstop6h 05m

Miami

Tue 6/16

6:20 pm-10:00 pm

Nonstop6h 40m

$426

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Sun 5/17

7:50 am-4:50 pm

Nonstop6h 00m

Miami

Sun 5/24

6:05 pm-9:55 pm

Nonstop6h 50m

$462

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 6/2

10:40 pm-2:38 pm

2 stops12h 58m

Miami

Tue 6/9

12:30 pm-7:05 pm

1 stop9h 35m

$476

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/2

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

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.
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

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 May 7, 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 May 7, 2026.

The most flights from SEA to KE9 are scheduled on a Wednesday (4 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 on average).

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

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 May 7, 2026.
See what other customers who have flown with Alaska Airlines,Delta, andHawaiian 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.
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
7.9
Good
12,332 reviews
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,458 reviews
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Hawaiian Airlines
7.8
Good
2,837 reviews
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
American Airlines
7.1
Good
11,669 reviews
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Frontier
5.6
Fair
2,964 reviews
Alaska Airlines
7.9
Good
12,332 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

7.9

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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.

  • What airport do you fly from for flights from Seattle to Key Largo?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Key Largo. You should not have trouble finding flights to Key Largo from Seattle/Tacoma Intl; the airport handles an average of 2 outbound flights to Key Largo per day. You should also have plenty of airline options to choose from since 10 airlines have flights from the Seattle airport to Key Largo. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

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

    The Seattle/Tacoma Intl to Key Largo flight path was viewed by 54 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Seattle to Key Largo?

    Departing from Seattle to Key Largo will take you 9h. There are 2719 mi between Seattle and Key Largo. This flight may include one or multiple stops.

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

    $106 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and Hawaiian Airlines, with prices starting from $116 and $118, respectively.

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

    Before booking your flight to Key Largo from Seattle, check out the most reliable airlines to get you to your destination on time: Qatar Airways (100%), Finnair (80%), LATAM Airlines( 72%).

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

    The cheapest flight price from Seattle to Key Largo is $197. On average you can expect to pay $960. The most popular route, (Seattle/Tacoma Intl - Miami), can usually be booked for $237.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Top 10 airlines flying from Seattle to Key Largo

Discover the top 10 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 May 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$118Average$307FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$134Average$202FlexibilityNo cancel feeOn-time65%
FrontierCheapest$143Average$287FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$152Average$232FlexibilityNo cancel feeOn-time83%
DeltaCheapest$159Average$455FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$198Average$394FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$199Average$422FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$205Average$513FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$248Average$489FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$258Average$350FlexibilityNo cancel feeOn-time62%

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