What is the cheapest airline that flies from Key West to Seattle/Tacoma Intl?

American Airlines and United Airlines are the most popular carriers operating from Key West to Seattle/Tacoma Intl

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

Prices for flights from Key West Airport to Seattle/Tacoma Intl Airport were last updated today.

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

The number of operators available for flights from Key West Airport to Seattle/Tacoma Intl Airport is 1 as of June 2026.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Key West Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$214 Cheap Flights from Key West to Seattle in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Key West to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:19 pm - 11:59 pm

EYW

SEA

8h 40m

1 stop

7:20 am - 8:01 pm

SEA

EYW

9h 41m

1 stop

$429Delta

Wed, Sep 9 - Wed, Sep 16

11:45 am - 6:59 pm

EYW

SEA

10h 14m

1 stop

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$464Delta

Wed, Nov 25 - Tue, Dec 1

6:00 pm - 12:09 am

EYW

SEA

9h 09m

1 stop

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$482Delta

Thu, Nov 26 - Tue, Dec 1

11:45 am - 6:59 pm

EYW

SEA

10h 14m

1 stop

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$514Delta

Wed, Nov 25 - Tue, Dec 1

6:00 pm - 10:35 am

EYW

SEA

19h 35m

2 stops

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$523Delta

Wed, Nov 25 - Tue, Dec 1

6:19 pm - 11:59 pm

EYW

SEA

8h 40m

1 stop

7:20 am - 8:01 pm

SEA

EYW

9h 41m

1 stop

$535Delta

Fri, Sep 11 - Fri, Sep 18

12:40 pm - 7:44 pm

EYW

SEA

10h 04m

1 stop

5:18 am - 4:22 pm

SEA

EYW

8h 04m

1 stop

$539American Airlines

Wed, Nov 25 - Wed, Dec 2

6:00 pm - 12:09 am

EYW

SEA

9h 09m

1 stop

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$549Delta

Wed, Nov 25 - Thu, Dec 3

11:30 am - 8:29 pm

EYW

SEA

11h 59m

2 stops

6:40 am - 5:55 pm

SEA

EYW

8h 15m

1 stop

$551American Airlines

Wed, Sep 9 - Wed, Sep 16

7:00 am - 6:30 pm

EYW

SEA

14h 30m

2 stops

6:00 am - 7:43 pm

SEA

EYW

10h 43m

1 stop

$563Delta

Thu, Nov 26 - Tue, Dec 1

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United Airlines flights from Key West to Seattle

Our best United Airlines deals on Key West to Seattle flight tickets

United Airlines

Jul 9

EYW4:00 pmKey West

9h 56m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

Jul 13

SEA11:00 pmSeattle/Tacoma Intl

11h 30m

1 stop

EYW1:30 pmKey West

$625

United Airlines

Oct 30

EYW4:00 pmKey West

9h 53m

1 stop

SEA10:53 pmSeattle/Tacoma Intl

Nov 3

SEA11:16 pmSeattle/Tacoma Intl

11h 43m

1 stop

EYW1:59 pmKey West

$652

United Airlines

Oct 30

EYW4:00 pmKey West

29h 31m

2 stops

SEA6:31 pmSeattle/Tacoma Intl

Nov 3

SEA11:16 pmSeattle/Tacoma Intl

11h 43m

1 stop

EYW1:59 pmKey West

$690

Delta flights from Key West to Seattle

Our best Delta deals on Key West to Seattle flight tickets

Delta

Sep 9

EYW6:19 pmKey West

8h 40m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

Sep 16

SEA7:20 amSeattle/Tacoma Intl

9h 41m

1 stop

EYW8:01 pmKey West

$429

Delta

Nov 25

EYW11:45 amKey West

10h 14m

1 stop

SEA6:59 pmSeattle/Tacoma Intl

Dec 1

SEA6:00 amSeattle/Tacoma Intl

10h 43m

1 stop

EYW7:43 pmKey West

$464

Delta

Nov 26

EYW6:00 pmKey West

9h 09m

1 stop

SEA12:09 amSeattle/Tacoma Intl

Dec 1

SEA6:00 amSeattle/Tacoma Intl

10h 43m

1 stop

EYW7:43 pmKey West

$482

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 9/9

6:19 pm-11:59 pm

1 stop8h 40m

Seattle/Tacoma Intl

Wed 9/16

7:20 am-8:01 pm

1 stop9h 41m

$429

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 11/25

11:45 am-6:59 pm

1 stop10h 14m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-7:43 pm

1 stop10h 43m

$464

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Thu 11/26

6:00 pm-12:09 am

1 stop9h 09m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-7:43 pm

1 stop10h 43m

$482

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 11/25

11:45 am-6:59 pm

1 stop10h 14m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-7:43 pm

1 stop10h 43m

$514

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 11/25

6:00 pm-10:35 am

2 stops19h 35m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-7:43 pm

1 stop10h 43m

$523

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Fri 9/11

6:19 pm-11:59 pm

1 stop8h 40m

Seattle/Tacoma Intl

Fri 9/18

7:20 am-8:01 pm

1 stop9h 41m

$535

Quickest round-trip

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 11/25

12:40 pm-7:44 pm

1 stop10h 04m

Seattle/Tacoma Intl

Wed 12/2

5:18 am-4:22 pm

1 stop8h 04m

$539

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 11/25

6:00 pm-12:09 am

1 stop9h 09m

Seattle/Tacoma Intl

Thu 12/3

6:00 am-7:43 pm

1 stop10h 43m

$549

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Wed 9/9

11:30 am-8:29 pm

2 stops11h 59m

Seattle/Tacoma Intl

Wed 9/16

6:40 am-5:55 pm

1 stop8h 15m

$551

Key WestSeattle

EYW - SEA

EYWSEA

Key West

Thu 11/26

7:00 am-6:30 pm

2 stops14h 30m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-7:43 pm

1 stop10h 43m

$563

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first

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

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

Prices

Airlines

What is the cheapest month to fly to Seattle?

In general, October is the cheapest month to fly from Key West to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Seattle in October, then you should wait until May to fly from Key West, when ticket prices are also cheap, with an average price of $0.

When to book flights from Key West to Seattle

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

Estimated round-trip price

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

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

Fastest flight time	8h 40m
Direct flights	None

The fastest flight from Key West to Seattle takes 8h 40m

There are no direct flights from Key West to Seattle. There are no popular flight routes from Key West to Seattle.

Search flight deals

Frequently asked questions about flying from Key West to Seattle

How far is Key West to Seattle/Tacoma Intl by plane?
The straight-line distance from Key West to Seattle/Tacoma Intl is 2719.2 mi. 8h 40m is a normal flight duration for this route.
When did momondo last update prices for flights from Key West Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Key West Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Key West Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Key West Airport to Seattle/Tacoma Intl Airport is 1 as of June 2026.
How old do you have to be to fly from Key West Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Key West Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Key West to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Key West to Seattle is American Airlines (100% of total bookings).

Best airlines flying from Key West to Seattle

Compare and see reviews for airlines that fly from Key West to Seattle with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $308	Free Cancellation	Rating 7.1 11,757 reviews		Search American Airlines flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Redmond

Kent

Lakewood

Puyallup

Tukwila

Federal Way

Fife

Cle Elum

Marysville

Centralia

Kirkland

Shoreline

Westport

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Key West to Seattle. momondo saves you time and could save you money on your trip.

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

momondo does allow users to show only those flights to Seattle from Key West which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Seattle from Key West.

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

Yes. momondo can track prices for Key West to Seattle flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.