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

American Airlines 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 72% 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 December 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.

$160 Cheap Flights from Seattle to Key West in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to Key West

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 4:24 pm

SEA

EYW

7h 24m1 stop

2:04 pm - 10:07 pm

EYW

SEA

11h 03m1 stop

$293American Airlines

Mon, Jan 12 - Sat, Jan 17

8:35 am - 11:56 pm

SEA

EYW

12h 21m2 stops

2:04 pm - 10:07 pm

EYW

SEA

11h 03m1 stop

$298American Airlines

Mon, Jan 12 - Sat, Jan 17

8:35 am - 11:56 pm

SEA

EYW

12h 21m2 stops

6:06 am - 3:34 pm

EYW

SEA

12h 28m2 stops

$303American Airlines

Sat, Jan 17 - Sat, Jan 31

8:35 am - 11:56 pm

SEA

EYW

12h 21m2 stops

1:22 pm - 8:45 pm

EYW

SEA

10h 23m1 stop

$328American Airlines

Sat, Jan 17 - Sat, Jan 31

7:00 am - 6:01 pm

SEA

EYW

8h 01m1 stop

1:22 pm - 8:45 pm

EYW

SEA

10h 23m1 stop

$329American Airlines

Tue, Jan 13 - Wed, Jan 21

7:59 pm - 7:40 pm

SEA

EYW

20h 41m2 stops

2:45 pm - 11:15 pm

EYW

SEA

11h 30m1 stop

$332Delta

Sat, Jan 17 - Tue, Jan 27

7:00 am - 6:01 pm

SEA

EYW

8h 01m1 stop

6:06 am - 3:34 pm

EYW

SEA

12h 28m2 stops

$334American Airlines

Tue, Jan 13 - Wed, Jan 21

8:04 am - 9:47 pm

SEA

EYW

10h 43m2 stops

6:06 am - 3:34 pm

EYW

SEA

12h 28m2 stops

$339American Airlines

Tue, Jan 13 - Wed, Jan 21

7:00 am - 6:01 pm

SEA

EYW

8h 01m1 stop

3:15 pm - 10:07 pm

EYW

SEA

9h 52m1 stop

$354American Airlines

Tue, Jan 20 - Sat, Jan 24

7:00 am - 6:06 pm

SEA

EYW

8h 06m1 stop

3:15 pm - 10:07 pm

EYW

SEA

9h 52m1 stop

$359American Airlines

Sat, Jan 24 - Sat, Jan 31

American Airlines flights from Seattle to Key West

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

American Airlines

Jan 12

SEA6:00 amSeattle/Tacoma Intl

7h 24m

1 stop

EYW4:24 pmKey West

Jan 17

EYW2:04 pmKey West

11h 03m

1 stop

SEA10:07 pmSeattle/Tacoma Intl

$293

Find similar

American Airlines

Jan 12

SEA8:35 amSeattle/Tacoma Intl

12h 21m

2 stops

EYW11:56 pmKey West

Jan 17

EYW2:04 pmKey West

11h 03m

1 stop

SEA10:07 pmSeattle/Tacoma Intl

$298

Find similar

American Airlines

Jan 17

SEA8:35 amSeattle/Tacoma Intl

12h 21m

2 stops

EYW11:56 pmKey West

Jan 31

EYW6:06 amKey West

12h 28m

2 stops

SEA3:34 pmSeattle/Tacoma Intl

$303

Find similar

United Airlines flights from Seattle to Key West

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

United Airlines

Jan 17

SEA11:45 pmSeattle/Tacoma Intl

10h 18m

1 stop

EYW1:03 pmKey West

Jan 28

EYW2:25 pmKey West

11h 50m

1 stop

SEA11:15 pmSeattle/Tacoma Intl

$393

Find similar

United Airlines

Jan 24

SEA11:45 pmSeattle/Tacoma Intl

10h 18m

1 stop

EYW1:03 pmKey West

Jan 28

EYW2:25 pmKey West

11h 50m

1 stop

SEA11:15 pmSeattle/Tacoma Intl

$429

Find similar

United Airlines

Jan 24

SEA11:45 pmSeattle/Tacoma Intl

10h 18m

1 stop

EYW1:03 pmKey West

Jan 28

EYW4:15 pmKey West

29h 11m

2 stops

SEA6:26 pmSeattle/Tacoma Intl

$458

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 1/12

6:00 am-4:24 pm

1 stop7h 24m

Key West

Sat 1/17

2:04 pm-10:07 pm

1 stop11h 03m

$293

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Mon 1/12

8:35 am-11:56 pm

2 stops12h 21m

Key West

Sat 1/17

2:04 pm-10:07 pm

1 stop11h 03m

$298

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

8:35 am-11:56 pm

2 stops12h 21m

Key West

Sat 1/31

6:06 am-3:34 pm

2 stops12h 28m

$303

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

8:35 am-11:56 pm

2 stops12h 21m

Key West

Sat 1/31

1:22 pm-8:45 pm

1 stop10h 23m

$328

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 1/13

7:00 am-6:01 pm

1 stop8h 01m

Key West

Wed 1/21

1:22 pm-8:45 pm

1 stop10h 23m

$329

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/17

7:59 pm-7:40 pm

2 stops20h 41m

Key West

Tue 1/27

2:45 pm-11:15 pm

1 stop11h 30m

$332

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 1/13

7:00 am-6:01 pm

1 stop8h 01m

Key West

Wed 1/21

6:06 am-3:34 pm

2 stops12h 28m

$334

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 1/13

8:04 am-9:47 pm

2 stops10h 43m

Key West

Wed 1/21

6:06 am-3:34 pm

2 stops12h 28m

$339

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 1/20

7:00 am-6:01 pm

1 stop8h 01m

Key West

Sat 1/24

3:15 pm-10:07 pm

1 stop9h 52m

$354

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Sat 1/24

7:00 am-6:06 pm

1 stop8h 06m

Key West

Sat 1/31

3:15 pm-10:07 pm

1 stop9h 52m

$359

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 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 January is also very affordable. Most momondo users find prices during this month for around $408.

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 $602 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 $420 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

Fastest flight time	7h 56m
Direct flights	None

The fastest flight from Seattle to Key West takes 7h 56m

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 7h 56m.
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 December 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 (72% of total bookings). The next most popular airlines are Delta (19%) 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 9,091 reviews	Search United Airlines flights
American Airlines	PriceFrom $318	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights
Delta	PriceFrom $338	Free Cancellation	Rating 7.9 8,005 reviews	Search Delta flights

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.