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Cheap flights from Seattle to Key West from $150

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Key West departing on 5/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Key West

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
10:47 pm - 1:49 pm
SEA
-
EYW
12h 02m
1 stop
American Airlines Logo
2:29 pm - 10:47 pm
EYW
-
SEA
11h 18m
1 stop
$366American Airlines
Mon, Apr 20 - Wed, Apr 29
American Airlines Logo
6:00 am - 5:02 pm
SEA
-
EYW
8h 02m
1 stop
American Airlines Logo
6:45 am - 2:27 pm
EYW
-
SEA
10h 42m
2 stops
$391American Airlines
Mon, Apr 20 - Wed, Apr 29
United Airlines Logo
10:55 pm - 1:31 pm
SEA
-
EYW
11h 36m
1 stop
United Airlines Logo
4:38 pm - 11:12 pm
EYW
-
SEA
9h 34m
1 stop
$469United Airlines
Mon, Apr 13 - Wed, Apr 22
Delta Logo
6:00 am - 5:23 pm
SEA
-
EYW
8h 23m
1 stop
Delta Logo
7:33 am - 3:25 pm
EYW
-
SEA
10h 52m
1 stop
$474Delta
Tue, Apr 14 - Wed, Apr 22
Delta Logo
6:00 am - 5:23 pm
SEA
-
EYW
8h 23m
1 stop
Delta Logo
6:23 pm - 3:25 pm
EYW
-
SEA
24h 02m
1 stop
$477Delta
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
11:55 pm - 4:30 pm
SEA
-
EYW
13h 35m
2 stops
American Airlines Logo
3:58 pm - 12:44 am
EYW
-
SEA
11h 46m
2 stops
$479American Airlines
Mon, Apr 13 - Wed, Apr 22
United Airlines Logo
10:55 pm - 1:31 pm
SEA
-
EYW
11h 36m
1 stop
United Airlines Logo
2:49 pm - 11:59 pm
EYW
-
SEA
12h 10m
1 stop
$487United Airlines
Sat, Apr 25 - Sat, May 2
United Airlines Logo
11:05 pm - 1:31 pm
SEA
-
EYW
11h 26m
1 stop
United Airlines Logo
4:38 pm - 11:12 pm
EYW
-
SEA
9h 34m
1 stop
$489United Airlines
Tue, Mar 31 - Tue, Apr 14
Delta Logo
6:00 am - 5:23 pm
SEA
-
EYW
8h 23m
1 stop
Delta Logo
6:23 pm - 10:58 am
EYW
-
SEA
19h 35m
2 stops
$491Delta
Tue, Apr 14 - Tue, Apr 21
Delta Logo
6:00 am - 5:23 pm
SEA
-
EYW
8h 23m
1 stop
Delta Logo
6:23 pm - 9:53 am
EYW
-
SEA
18h 30m
2 stops
$492Delta
Tue, Apr 14 - Mon, Apr 20

United Airlines flights from Seattle to Key West

Our best United Airlines deals on Seattle to Key West flight tickets
United Airlines
Apr 13
SEA10:55 pmSeattle/Tacoma Intl
11h 36m
1 stop
EYW1:31 pmKey West
Apr 22
EYW4:38 pmKey West
9h 34m
1 stop
SEA11:12 pmSeattle/Tacoma Intl
$469
United Airlines
Apr 25
SEA10:55 pmSeattle/Tacoma Intl
11h 36m
1 stop
EYW1:31 pmKey West
May 2
EYW2:49 pmKey West
12h 10m
1 stop
SEA11:59 pmSeattle/Tacoma Intl
$487
United Airlines
Mar 31
SEA11:05 pmSeattle/Tacoma Intl
11h 26m
1 stop
EYW1:31 pmKey West
Apr 14
EYW4:38 pmKey West
9h 34m
1 stop
SEA11:12 pmSeattle/Tacoma Intl
$489

Delta flights from Seattle to Key West

Our best Delta deals on Seattle to Key West flight tickets
Delta
Apr 14
SEA6:00 amSeattle/Tacoma Intl
8h 23m
1 stop
EYW5:23 pmKey West
Apr 22
EYW7:33 amKey West
10h 52m
1 stop
SEA3:25 pmSeattle/Tacoma Intl
$474
Delta
Apr 14
SEA6:00 amSeattle/Tacoma Intl
8h 23m
1 stop
EYW5:23 pmKey West
Apr 21
EYW6:23 pmKey West
24h 02m
1 stop
SEA3:25 pmSeattle/Tacoma Intl
$477
Delta
Apr 14
SEA6:00 amSeattle/Tacoma Intl
8h 23m
1 stop
EYW5:23 pmKey West
Apr 21
EYW6:23 pmKey West
19h 35m
2 stops
SEA10:58 amSeattle/Tacoma Intl
$491

momondo 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, momondo users made 832,500 searches. Data last updated March 16, 2026.
Use the filters below to find and compare flights from Seattle to Key West that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 4/20

10:47 pm-1:49 pm

1 stop12h 02m

Key West

Wed 4/29

2:29 pm-10:47 pm

1 stop11h 18m

$366
Quickest round-trip

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 4/20

6:00 am-5:02 pm

1 stop8h 02m

Key West

Wed 4/29

6:45 am-2:27 pm

2 stops10h 42m

$391

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 4/13

10:55 pm-1:31 pm

1 stop11h 36m

Key West

Wed 4/22

4:38 pm-11:12 pm

1 stop9h 34m

$469

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 4/14

6:00 am-5:23 pm

1 stop8h 23m

Key West

Wed 4/22

7:33 am-3:25 pm

1 stop10h 52m

$474

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 4/14

6:00 am-5:23 pm

1 stop8h 23m

Key West

Tue 4/21

6:23 pm-3:25 pm

1 stop24h 02m

$477

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 4/13

11:55 pm-4:30 pm

2 stops13h 35m

Key West

Wed 4/22

3:58 pm-12:44 am

2 stops11h 46m

$479

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 4/25

10:55 pm-1:31 pm

1 stop11h 36m

Key West

Sat 5/2

2:49 pm-11:59 pm

1 stop12h 10m

$487

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 3/31

11:05 pm-1:31 pm

1 stop11h 26m

Key West

Tue 4/14

4:38 pm-11:12 pm

1 stop9h 34m

$489

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 4/14

6:00 am-5:23 pm

1 stop8h 23m

Key West

Tue 4/21

6:23 pm-10:58 am

2 stops19h 35m

$491

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 4/14

6:00 am-5:23 pm

1 stop8h 23m

Key West

Mon 4/20

6:23 pm-9:53 am

2 stops18h 30m

$492

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Key West from

How to get the cheapest flight ticket from Seattle to Key West

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Key West?

In general, September is the cheapest month to fly from Seattle to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $384. If you are unable to visit Key West during the month of September, then departing from Seattle during the month October is also very affordable. Most momondo users find prices during this month for around $433.

Can stopping save me money on Seattle to Key West flights?

You could potentially save up to 34% on your flight if you consider stops on a Seattle to Key West flight.

How have Seattle to Key West flight prices changed over time?

As of March 2026, prices for Seattle to Key West flights are approximately 14% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Key West

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Key West according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Key West (SEA to EYW) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Key West

Fastest flight time

8h 23m

Direct flights

None
The fastest flight from Seattle to Key West takes 8h 23m
There are no direct flights from Seattle to Key West. There are no popular flight routes from Seattle to Key West.
Search flight deals

  • How far is Seattle/Tacoma Intl to Key West by plane?

    The distance between Seattle/Tacoma Intl and Key West is about 2719.2 mi. By plane, this route typically takes 8h 23m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Key West Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Key West Airport refresh daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Key West Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Key West Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Key West Airport.

  • What documentation or ID do you need to fly to Key West Airport?

    The travel and health documents required for your trip to Key West Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Key West Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Seattle to Key West?

Best airlines flying from Seattle to Key West

Compare and see reviews for airlines that fly from Seattle to Key West with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $328Free CancellationRating
7.1
11,467 reviews
Search American Airlines flights
DeltaPriceFrom $338Free CancellationRating
7.9
8,296 reviews
Search Delta flights

Traveling to a place near Key West?

Book flights to Key West if you plan to visit one of these locations
Big Pine Key
Little Torch Key

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Key West?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Key West from Seattle.

Can I find flights from Seattle to Key West with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to Key West flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to Key West?

momondo helps you find the best flight between Seattle and Key West by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Key West right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Key West, momondo offers a useful price alert feature which will track prices for flights to Key West from Seattle and alert you when they change.

An easier way to manage your Key West trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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