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

Delta is the most popular carrier operating from Seattle/Tacoma Intl to Key West

What airlines fly to Key West?

American Airlines, Delta and United Airlines are the top three most popular airlines that fly to Key West from Seattle according to our data. American Airlines is the first choice among our users, with 74% of people opting to fly with this airline when traveling to Key West. Keep in mind that there are 3 different airlines that fly to Key West on a routine basis, so you have a few additional options to choose from.

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?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Key West Airport is 3 as of November 2025.

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.

$121 Cheap Flights from Seattle to Key West in 2025/26

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Find the cheapest flights from Seattle to Key West

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:11 pm - 10:57 amSEA-EYW

8h 46m1 stop

3:15 pm - 10:07 pmEYW-SEA

9h 52m1 stop

$309American Airlines

Find Deal

Sat, Jan 17 - Sat, Jan 31

11:11 pm - 10:57 amSEA-EYW

8h 46m1 stop

6:06 am - 3:34 pmEYW-SEA

12h 28m2 stops

$314American Airlines

Find Deal

Sat, Jan 17 - Sat, Jan 31

9:45 pm - 1:03 pmSEA-EYW

12h 18m2 stops

6:06 am - 3:34 pmEYW-SEA

12h 28m2 stops

$319American Airlines

Find Deal

Sat, Jan 17 - Sat, Jan 31

12:59 am - 4:43 pmSEA-EYW

12h 44m2 stops

2:40 pm - 9:16 pmEYW-SEA

9h 36m1 stop

$339American Airlines

Find Deal

Tue, Feb 17 - Wed, Feb 25

12:59 am - 4:43 pmSEA-EYW

12h 44m2 stops

12:55 pm - 10:17 pmEYW-SEA

12h 22m2 stops

$344American Airlines

Find Deal

Tue, Feb 17 - Wed, Feb 25

6:15 am - 7:40 pmSEA-EYW

10h 25m1 stop

7:10 am - 10:24 pmEYW-SEA

18h 14m2 stops

$351Delta

Find Deal

Sat, Jan 10 - Wed, Jan 14

8:30 am - 11:07 pmSEA-EYW

11h 37m2 stops

2:39 pm - 9:13 pmEYW-SEA

9h 34m1 stop

$354American Airlines

Find Deal

Wed, Dec 3 - Tue, Dec 9

8:30 am - 11:07 pmSEA-EYW

11h 37m2 stops

7:00 am - 3:24 pmEYW-SEA

11h 24m2 stops

$359American Airlines

Find Deal

Wed, Dec 3 - Tue, Dec 9

10:59 pm - 11:01 amSEA-EYW

9h 02m1 stop

2:45 pm - 11:12 pmEYW-SEA

11h 27m1 stop

$384Delta

Find Deal

Sat, Feb 21 - Thu, Feb 26

10:59 pm - 11:01 amSEA-EYW

9h 02m1 stop

7:10 am - 8:37 pmEYW-SEA

16h 27m2 stops

$387Delta

Find Deal

Sat, Feb 21 - Mon, Feb 23

United Airlines flights from Seattle to Key West

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

United Airlines

May 7

SEA10:45 pmSeattle/Tacoma Intl

11h 17m

1 stop

EYW1:02 pmKey West

May 15

EYW4:05 pmKey West

9h 24m

1 stop

SEA10:29 pmSeattle/Tacoma Intl

$376

Find similar

United Airlines

Feb 22

SEA11:45 pmSeattle/Tacoma Intl

10h 30m

1 stop

EYW1:15 pmKey West

Feb 28

EYW4:34 pmKey West

31h 27m

2 stops

SEA9:01 pmSeattle/Tacoma Intl

$482

Find similar

United Airlines

Feb 22

SEA11:45 pmSeattle/Tacoma Intl

10h 30m

1 stop

EYW1:15 pmKey West

Feb 28

EYW4:34 pmKey West

31h 27m

2 stops

SEA9:01 pmSeattle/Tacoma Intl

$492

Find similar

American Airlines flights from Seattle to Key West

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

American Airlines

Jan 17

SEA11:11 pmSeattle/Tacoma Intl

8h 46m

1 stop

EYW10:57 amKey West

Jan 31

EYW3:15 pmKey West

9h 52m

1 stop

SEA10:07 pmSeattle/Tacoma Intl

$309

Find similar

American Airlines

Jan 17

SEA11:11 pmSeattle/Tacoma Intl

8h 46m

1 stop

EYW10:57 amKey West

Jan 31

EYW6:06 amKey West

12h 28m

2 stops

SEA3:34 pmSeattle/Tacoma Intl

$314

Find similar

American Airlines

Jan 17

SEA9:45 pmSeattle/Tacoma Intl

12h 18m

2 stops

EYW1:03 pmKey West

Jan 31

EYW6:06 amKey West

12h 28m

2 stops

SEA3:34 pmSeattle/Tacoma Intl

$319

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

11:11 pm-10:57 am

1 stop8h 46m

Key West

Sat 1/31

3:15 pm-10:07 pm

1 stop9h 52m

$309

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

11:11 pm-10:57 am

1 stop8h 46m

Key West

Sat 1/31

6:06 am-3:34 pm

2 stops12h 28m

$314

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

9:45 pm-1:03 pm

2 stops12h 18m

Key West

Sat 1/31

6:06 am-3:34 pm

2 stops12h 28m

$319

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 2/17

12:59 am-4:43 pm

2 stops12h 44m

Key West

Wed 2/25

2:40 pm-9:16 pm

1 stop9h 36m

$339

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 2/17

12:59 am-4:43 pm

2 stops12h 44m

Key West

Wed 2/25

12:55 pm-10:17 pm

2 stops12h 22m

$344

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/10

6:15 am-7:40 pm

1 stop10h 25m

Key West

Wed 1/14

7:10 am-10:24 pm

2 stops18h 14m

$351

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 12/3

8:30 am-11:07 pm

2 stops11h 37m

Key West

Tue 12/9

2:39 pm-9:13 pm

1 stop9h 34m

$354

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 12/3

8:30 am-11:07 pm

2 stops11h 37m

Key West

Tue 12/9

7:00 am-3:24 pm

2 stops11h 24m

$359

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 2/21

10:59 pm-11:01 am

1 stop9h 02m

Key West

Thu 2/26

2:45 pm-11:12 pm

1 stop11h 27m

$384

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 2/21

10:59 pm-11:01 am

1 stop9h 02m

Key West

Mon 2/23

7:10 am-8:37 pm

2 stops16h 27m

$387

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 $383. 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 $458.

What is the cheapest day to depart on your flight to Key West?

On average, the least expensive day to fly to Key West from Seattle is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $597. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Key West for around $940.

What is the cheapest time of day to depart on your flight to Key West?

According to our data, the cheapest time of day to fly to Key West is in the morning. momondo users have found flights departing from Seattle to Key West in the morning for as low as $674. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Key West are more costly in the evening, with an average ticket price of $756. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Key West?

You are more likely to see cheaper flights to Key West from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $609 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Key West from Seattle for as low as $361 on momondo.

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

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

Direct flights	None

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 01m.
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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Key West Airport is 3 as of November 2025.
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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Key West is American Airlines (74% of total bookings). The next most popular airlines are Delta (17%) and United Airlines (9%).

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
United Airlines	PriceFrom $278	Free Cancellation	Rating 7.4 9,025 reviews	Search United Airlines flights
American Airlines	PriceFrom $308	Free Cancellation	Rating 7.2 11,046 reviews	Search American Airlines flights
Delta	PriceFrom $338	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights

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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.