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

Delta 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 2 as of August 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.

$489 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.

4:00 pm - 10:56 pmEYW Key West-SEA Seattle/Tacoma Intl

9h 56m1 stop Chicago O'Hare Intl

11:15 pm - 1:52 pmSEA Seattle/Tacoma Intl-EYW Key West

11h 37m1 stop Newark

$489United Airlines

Sat, Oct 24 - Tue, Oct 27

2:00 pm - 9:15 pmEYW Key West-SEA Seattle/Tacoma Intl

10h 15m1 stop Atlanta Hartsfield-Jackson

6:00 am - 5:23 pmSEA Seattle/Tacoma Intl-EYW Key West

8h 23m1 stop Atlanta Hartsfield-Jackson

$497Delta

Fri, Sep 11 - Tue, Sep 15

7:03 pm - 12:20 amEYW Key West-SEA Seattle/Tacoma Intl

8h 17m1 stop Miami

8:47 pm - 9:44 amSEA Seattle/Tacoma Intl-EYW Key West

9h 57m1 stop Miami

$555American Airlines

Tue, Sep 1 - Sat, Sep 5

2:15 pm - 8:07 pmEYW Key West-SEA Seattle/Tacoma Intl

8h 52m1 stop Charlotte Douglas

11:57 pm - 1:17 pmSEA Seattle/Tacoma Intl-EYW Key West

10h 20m2 stops Chicago O'Hare Intl Miami

$561American Airlines

Fri, Sep 11 - Tue, Sep 15

4:00 pm - 10:56 pmEYW Key West-SEA Seattle/Tacoma Intl

9h 56m1 stop Chicago O'Hare Intl

3:35 pm - 3:29 pmSEA Seattle/Tacoma Intl-EYW Key West

20h 54m2 stops San Francisco Chicago O'Hare Intl

$597United Airlines

Sat, Oct 24 - Tue, Oct 27

11:30 am - 8:10 pmEYW Key West-SEA Seattle/Tacoma Intl

11h 40m2 stops Miami Phoenix Sky Harbor Intl

8:47 pm - 9:44 amSEA Seattle/Tacoma Intl-EYW Key West

9h 57m1 stop Miami

$619American Airlines

Tue, Sep 1 - Sat, Sep 5

4:00 pm - 10:56 pmEYW Key West-SEA Seattle/Tacoma Intl

9h 56m1 stop Chicago O'Hare Intl

12:20 pm - 3:29 pmSEA Seattle/Tacoma Intl-EYW Key West

24h 09m3 stops Los Angeles Denver Intl Chicago O'Hare Intl

$647United Airlines

Sat, Oct 24 - Tue, Oct 27

4:00 pm - 11:26 amEYW Key West-SEA Seattle/Tacoma Intl

22h 26m2 stops Chicago O'Hare Intl Los Angeles

12:20 pm - 3:29 pmSEA Seattle/Tacoma Intl-EYW Key West

24h 09m3 stops Los Angeles Denver Intl Chicago O'Hare Intl

$761United Airlines

Sat, Oct 24 - Tue, Oct 27

6:10 pm - 11:52 pmEYW Key West-SEA Seattle/Tacoma Intl

8h 42m1 stop Atlanta Hartsfield-Jackson

6:00 am - 5:07 pmSEA Seattle/Tacoma Intl-EYW Key West

8h 07m1 stop Atlanta Hartsfield-Jackson

$6,014Delta

Tue, Oct 13 - Tue, Dec 1

11:51 am - 11:59 pmEYW Key West-SEA Seattle/Tacoma Intl

15h 08m2 stops Atlanta Hartsfield-Jackson Minneapolis St Paul

7:59 pm - 10:48 amSEA Seattle/Tacoma Intl-EYW Key West

11h 49m2 stops Los Angeles Atlanta Hartsfield-Jackson

$6,561Delta

Tue, Oct 13 - 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

Oct 24

EYW4:00 pmKey West

9h 56m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

Oct 27

SEA11:15 pmSeattle/Tacoma Intl

11h 37m

1 stop

EYW1:52 pmKey West

$489

United Airlines

Oct 24

EYW4:00 pmKey West

9h 56m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

Oct 27

SEA3:35 pmSeattle/Tacoma Intl

20h 54m

2 stops

EYW3:29 pmKey West

$597

United Airlines

Oct 24

EYW4:00 pmKey West

9h 56m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

Oct 27

SEA12:20 pmSeattle/Tacoma Intl

24h 09m

3 stops

EYW3:29 pmKey West

$647

American Airlines flights from Key West to Seattle

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

American Airlines

Sep 1

EYW7:03 pmKey West

8h 17m

1 stop

SEA12:20 amSeattle/Tacoma Intl

Sep 5

SEA8:47 pmSeattle/Tacoma Intl

9h 57m

1 stop

EYW9:44 amKey West

$555

American Airlines

Sep 11

EYW2:15 pmKey West

8h 52m

1 stop

SEA8:07 pmSeattle/Tacoma Intl

Sep 15

SEA11:57 pmSeattle/Tacoma Intl

10h 20m

2 stops

EYW1:17 pmKey West

$561

American Airlines

Sep 1

EYW11:30 amKey West

11h 40m

2 stops

SEA8:10 pmSeattle/Tacoma Intl

Sep 5

SEA8:47 pmSeattle/Tacoma Intl

9h 57m

1 stop

EYW9:44 amKey West

$619

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Sat 10/24

4:00 pm-10:56 pm

1 stop9h 56m

Seattle/Tacoma Intl

Tue 10/27

11:15 pm-1:52 pm

1 stop11h 37m

$489

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Fri 9/11

2:00 pm-9:15 pm

1 stop10h 15m

Seattle/Tacoma Intl

Tue 9/15

6:00 am-5:23 pm

1 stop8h 23m

$497

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Tue 9/1

7:03 pm-12:20 am

1 stop8h 17m

Seattle/Tacoma Intl

Sat 9/5

8:47 pm-9:44 am

1 stop9h 57m

$555

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Fri 9/11

2:15 pm-8:07 pm

1 stop8h 52m

Seattle/Tacoma Intl

Tue 9/15

11:57 pm-1:17 pm

2 stops10h 20m

$561

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Sat 10/24

4:00 pm-10:56 pm

1 stop9h 56m

Seattle/Tacoma Intl

Tue 10/27

3:35 pm-3:29 pm

2 stops20h 54m

$597

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Tue 9/1

11:30 am-8:10 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sat 9/5

8:47 pm-9:44 am

1 stop9h 57m

$619

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Sat 10/24

4:00 pm-10:56 pm

1 stop9h 56m

Seattle/Tacoma Intl

Tue 10/27

12:20 pm-3:29 pm

3 stops24h 09m

$647

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Sat 10/24

4:00 pm-11:26 am

2 stops22h 26m

Seattle/Tacoma Intl

Tue 10/27

12:20 pm-3:29 pm

3 stops24h 09m

$761

Quickest round-trip

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Tue 10/13

6:10 pm-11:52 pm

1 stop8h 42m

Seattle/Tacoma Intl

Tue 12/1

6:00 am-5:07 pm

1 stop8h 07m

$6,014

Key WestSeattle

EYW Key West - SEA Seattle/Tacoma Intl

EYWSEA

Key West

Tue 10/13

11:51 am-11:59 pm

2 stops15h 08m

Seattle/Tacoma Intl

Tue 12/1

7:59 pm-10:48 am

2 stops11h 49m

$6,561

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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

Best Price Found	$688
Fastest flight time	10h 15m
Direct flights	None

The best one-way flight to Seattle from Key West in the past 72 hours is $688. The best round-trip flight deal from Key West to Seattle found on momondo in the last 72 hours is $489.

The fastest flight from Key West to Seattle takes 10h 15m

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. 10h 15m 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 2 as of August 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 (54% of total bookings). The next most popular airline is Delta (46%).

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 11,969 reviews		Search American Airlines flights
Delta	PriceFrom $428	Free Cancellation	Rating 7.8 8,505 reviews		Search Delta flights

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Puyallup

Fife

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Cle Elum

Marysville

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Lacey

Shoreline

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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.