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$171+ Cheap flights from Seattle to Key West (SEA - EYW)

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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EYW
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Key West are usually found in September or January, booked 66 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Seattle to Key West

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Key West (EYW). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$329
(American Airlines)

One-way from

$171
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$442
From Seattle/Tacoma Intl to Key West
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One-way flight from Seattle/Tacoma Intl to Key West
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Highest demand for flights based on searches. 12% potential increase in price ($90 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Seattle to Key West

Cheapest flights from Seattle to Key West
Explore the most affordable flight options available from Seattle to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This American Airlines deal was found by Cheapflights users on 9/10. 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 10/135:22 amSEA - EYW
1 stop7h 51mAmerican Airlines
Fri 10/244:37 pmEYW - SEA
1 stop8h 43mAmerican Airlines
Deal found 9/10$329
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/2510:01 pmSEA - EYW
1 stop11h 09mAmerican Airlines
Fri 10/312:14 pmEYW - SEA
1 stop11h 16mAmerican Airlines
Deal found 9/10$330
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Sun 10/511:05 pmSEA - EYW
1 stop11h 47mAmerican Airlines
Sat 10/185:47 pmEYW - SEA
1 stop8h 48mAmerican Airlines
Deal found 9/10$359
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 11/65:24 amSEA - EYW
1 stop8h 05mAmerican Airlines
Wed 11/121:23 pmEYW - SEA
2 stops12h 55mAmerican Airlines
Deal found 9/9$364
This American Airlines deal was found by Cheapflights users on 9/9. 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 11/255:24 amSEA - EYW
2 stops10h 59mAmerican Airlines
Wed 12/37:00 amEYW - SEA
2 stops11h 24mAmerican Airlines
Deal found 9/9$369
This American Airlines deal was found by Cheapflights users on 9/9. 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 10/1412:34 amSEA - EYW
2 stops11h 12mAmerican Airlines
Mon 10/205:47 pmEYW - SEA
1 stop8h 54mAmerican Airlines
Deal found 9/9$402
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Wed 12/36:19 amSEA - EYW
1 stop8h 33mAmerican Airlines
Sun 12/74:10 pmEYW - SEA
1 stop10h 06mAmerican Airlines
Deal found 9/9$444
This American Airlines deal was found by Cheapflights users on 9/9. 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 12/25:24 amSEA - EYW
2 stops10h 59mAmerican Airlines
Sun 12/74:10 pmEYW - SEA
1 stop10h 06mAmerican Airlines
Deal found 9/9$449

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Key West 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 September 11, 2025.
Use the filters below to find and compare flights from Seattle to Key West that are best for you.

Fly from

Seattle

Fly to

Key West

Route

Depart

Return

Price

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 10/25

10:01 pm-12:10 pm

1 stop11h 09m

Key West

Fri 10/31

2:14 pm-10:30 pm

1 stop11h 16m

$330

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 10/13

5:22 am-4:13 pm

1 stop7h 51m

Key West

Fri 10/24

11:22 am-7:27 pm

2 stops11h 05m

$334

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 11/25

11:15 pm-11:47 am

1 stop9h 32m

Key West

Wed 12/3

7:00 am-3:24 pm

2 stops11h 24m

$334

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Thu 11/6

5:24 am-4:29 pm

1 stop8h 05m

Key West

Wed 11/12

2:01 pm-11:18 pm

1 stop12h 17m

$359

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 10/14

12:34 am-2:46 pm

2 stops11h 12m

Key West

Mon 10/20

5:47 pm-11:41 pm

1 stop8h 54m

$402

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 12/10

10:59 pm-1:51 pm

1 stop11h 52m

Key West

Sun 12/14

12:50 pm-8:56 pm

1 stop11h 06m

$444

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 12/3

9:00 am-11:07 pm

2 stops11h 07m

Key West

Sun 12/7

4:10 pm-11:16 pm

1 stop10h 06m

$449

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Fri 10/24

10:54 pm-1:52 pm

1 stop11h 58m

Key West

Mon 10/27

2:32 pm-9:46 pm

1 stop10h 14m

$453

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 9/20

7:00 am-4:00 pm

3 stops30h 00m

$268

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Thu 12/4

2:36 pm-9:17 am

2 stops15h 41m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 12 results
1
2

Best time to book a flight from Seattle to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West 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 West

How far ahead should I book a flight from Seattle to Key West?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Key West. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from Seattle to Key West, you should look to book at least 65 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Seattle to Key West?

Currently, August is the cheapest month in which you can book a flight from Seattle to Key West (average of $328). Flying from Seattle to Key West in March is currently the most expensive (average of $491). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to EYW?

Find hourly flight availability from Seattle to Key West. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

One of the essential ways to save on airfare from Seattle to Key West is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 11% on airfare.

Reviews of airlines servicing Key West

Get insights into the airlines that provide service to Key West. 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 West. Reviews last updated September 11, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Seattle to Key West. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Key West. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    For as low as $330, American Airlines can have you in Key West from Seattle in 11h 09m. Airlines will cover a distance of 2715 mi.

  • What are the cheapest airlines flying from Seattle to Key West round-trip?

    Our cheapest airline available from Seattle to Key West is United Airlines. Our recent data shows that you can find tickets from as low as $278 on this airline. Additional options worth looking into are American Airlines and Delta, starting at $308 and $338 round-trip. United Airlines is 56% cheaper than the average price of flights available within the next 90 days to this destination.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from Seattle to Key West?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Key West (average of $328). Flying from Seattle to Key West in March is currently the most expensive (average of $491). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 3 airlines flying from Seattle to Key West

Discover the top 3 airlines that operate flights from Seattle to Key West. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$278Average$587FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$308Average$592FlexibilityNo cancel feeOn-time71%
DeltaCheapest$338Average$717FlexibilityNo cancel feeOn-timeN/A

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