What are the cheapest airlines flying from Seattle to Key West round-trip?

Our cheapest airline available from Seattle to Key West is American Airlines. Our recent data shows that you can find tickets from as low as $427 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $487 and $587 round-trip. American Airlines is 37% cheaper than the average price of flights available within the next 90 days to this destination.

What are the cheapest airlines to fly from Seattle to Key West one-way?

The cheapest airlines for a one-way flight from Seattle to Key West are United Airlines ($257), American Airlines ($279), and Delta ($708).

What is the cheapest day to fly from Seattle to Key West?

Travelers seeking maximum savings on their Seattle to Key West flight should consider departing on Wednesday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular airlines that fly from Seattle to Key West?

American Airlines, Delta and United Airlines are the most popular airlines when flying from Seattle to Key West.

What is the cheapest day to fly round-trip from Seattle to Key West?

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 57% on your flight compared to booking on days when demand is much higher.

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

Travelers have found it’s best to book a flight 41 days in advance to save up to 210% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 41 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to Key West 1-2 weeks in advance for as low as $538, or $1,028 for flights within the next 24 hours.

What is the cheapest month to fly from Seattle to Key West?

January is one of the best times of the year to fly to Key West from Seattle. Prices for January average $688 per person but you can even find prices for as low as $282. The most expensive prices can be found in the month of December. Opting for a January flight can save you 60% on your journey compared to booking in December

Most accurate provider : When it comes to deals on Seattle-Key West flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Key West flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Key West flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-Key West flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Key West flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Seattle to Key West that include hotel bookings?

Yes. In addition to deals on Seattle to Key West flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to Key West?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Key West.

Can I find deals for business class flights from Seattle to Key West?

Yes. Cheapflights offers flight deals from Seattle to Key West by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$178+ Flights from Seattle to Key West

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Find cheap flights from Seattle to Key West with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Key West are usually found in January or February, booked 66 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Seattle to Key West

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$427 (American Airlines)
One-way from	$178 (Mytrip)
Popular in	December
Cheapest in	January
Average price	$706

Provider with most accurate pricing for Seattle/Tacoma Intl-Key West flight deals.

Search Deals

Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Key West flights.

Search Deals

From Seattle/Tacoma Intl to Key West

Search Deals

One-way flight from Seattle/Tacoma Intl to Key West

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($74 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Find flight deals from Seattle to Key West

Cheapest flights from Seattle to Key West
Explore the most affordable flight options available from Seattle to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 3, 2025.

Tue 5/2012:24 amSEA - EYW

1 stop7h 26mAmerican Airlines

Wed 5/285:30 pmEYW - SEA

1 stop8h 37mAmerican Airlines

Deal found 4/2

$427

Wed 5/216:00 amSEA - EYW

3 stops31h 45mMultiple Airlines

Wed 5/283:03 pmEYW - SEA

3 stops36h 07mMultiple Airlines

Deal found 4/2

$452

Wed 4/306:15 amSEA - EYW

3 stops32h 50mUnited Airlines

Wed 5/78:45 amEYW - SEA

2 stops34h 13mUnited Airlines

Deal found 4/2

$487

Thu 7/176:00 amSEA - EYW

1 stop10h 46mDelta

Mon 7/216:00 pmEYW - SEA

1 stop9h 08mDelta

Deal found 4/2

$587

Best flights from Seattle to Key West
Discover carefully curated flight deals from Seattle to Key West that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 3, 2025.

Tue 5/2012:24 amSEA - EYW

1 stop7h 26mAmerican Airlines

Wed 5/285:30 pmEYW - SEA

1 stop8h 37mAmerican Airlines

Deal found 4/2

$427

Wed 5/216:00 amSEA - EYW

3 stops31h 45mMultiple Airlines

Wed 5/283:03 pmEYW - SEA

3 stops36h 07mMultiple Airlines

Deal found 4/2

$452

Wed 4/306:15 amSEA - EYW

3 stops32h 50mUnited Airlines

Wed 5/78:45 amEYW - SEA

2 stops34h 13mUnited Airlines

Deal found 4/2

$487

Thu 7/176:00 amSEA - EYW

1 stop10h 46mDelta

Mon 7/216:00 pmEYW - SEA

1 stop9h 08mDelta

Deal found 4/2

$587

Last-minute flights from Seattle to Key West
Discover last-minute flight deals from Seattle to Key West. Data last updated April 3, 2025 and is based on user searches.

Fri 4/1112:49 amSEA - EYW

2 stops10h 10mDelta

Thu 4/177:00 amEYW - SEA

2 stops13h 00mDelta

Deal found 4/2

$2,231

Sat 4/1210:59 pmSEA - EYW

1 stop9h 42mAmerican Airlines

Thu 4/172:38 pmEYW - SEA

1 stop9h 36mAmerican Airlines

Deal found 4/2

$734

Sat 4/123:35 pmSEA - EYW

2 stops20h 29mUnited Airlines

Thu 4/174:04 pmEYW - SEA

3 stops36h 04mUnited Airlines

Deal found 4/2

$895

Wed 4/306:15 amSEA - EYW

3 stops32h 50mUnited Airlines

Wed 5/78:45 amEYW - SEA

2 stops34h 13mUnited Airlines

Deal found 4/2

$487

Thu 5/112:45 amSEA - EYW

2 stops10h 20mDelta

Fri 5/26:13 pmEYW - SEA

1 stop8h 46mDelta

Deal found 4/1

$1,066

Tue 5/2012:24 amSEA - EYW

1 stop7h 26mAmerican Airlines

Wed 5/285:30 pmEYW - SEA

1 stop8h 37mAmerican Airlines

Deal found 4/2

$427

Wed 5/216:00 amSEA - EYW

3 stops31h 45mMultiple Airlines

Wed 5/283:03 pmEYW - SEA

3 stops36h 07mMultiple Airlines

Deal found 4/2

$452

One-way flights from Seattle to Key West
Search for one-way flight options from Seattle to Key West. Find affordable one-way fares based on user searches. Data last updated April 3, 2025.

Fri 5/212:30 pmSEA - EYW

2 stops23h 26mMultiple Airlines

Deal found 4/2

$178

Fri 5/211:59 pmSEA - EYW

2 stops15h 06mUnited Airlines

Deal found 4/1

$257

Fri 5/27:20 amSEA - EYW

1 stop8h 35mAmerican Airlines

Deal found 4/2

$279

Thu 5/112:45 amSEA - EYW

2 stops13h 32mDelta

Deal found 4/2

$708

Cheapflights Fare Finder

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

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Tue 5/20

12:24 am-10:50 am

1 stop7h 26m

Key West

Wed 5/28

5:30 pm-11:07 pm

1 stop8h 37m

$427

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 5/21

6:00 am-4:45 pm

3 stops31h 45m

Key West

Wed 5/28

3:03 pm-12:10 am

3 stops36h 07m

$452

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Wed 4/30

6:15 am-6:05 pm

3 stops32h 50m

Key West

Wed 5/7

8:45 am-3:58 pm

2 stops34h 13m

$487

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Thu 7/17

6:00 am-7:46 pm

1 stop10h 46m

Key West

Mon 7/21

6:00 pm-12:08 am

1 stop9h 08m

$587

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Fri 5/2

12:30 pm-2:56 pm

2 stops23h 26m

$178

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Fri 5/2

11:59 pm-6:05 pm

2 stops15h 06m

$257

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Fri 5/2

7:20 am-6:55 pm

1 stop8h 35m

$279

SeattleKey West

SEA - EYW

SEAEYW

Seattle/Tacoma Intl

Thu 5/1

12:45 am-5:17 pm

2 stops13h 32m

$708

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/2

Compare providers for flights from Seattle to Key West

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Key West in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-Key West flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Key West flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Key West flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-Key West flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Key West flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West from Seattle with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Key West

How far ahead should I book a flight from Seattle to Key West?

To ensure you get the cheapest price possible for a flight from Seattle to Key West, you should look to book at least 65 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Seattle to Key West?

Currently, August is the cheapest month in which you can book a flight from Seattle to Key West (average of $328). Flying from Seattle to Key West in March is currently the most expensive (average of $493). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to EYW?

One of the essential ways to save on airfare from Seattle to Key West is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 11% on airfare.

Rainfall in Key West by month

In terms of precipitation, rainfall in Key West ranges from 1.5 - 6.7 inches per month. September is typically the wettest month, when rainfall can reach 6.7 in. February is typically the driest time to visit Key West when rainfall is around 1.5 in.

Temperature in Key West by month

If weather is an important factor for your trip to Key West, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 69.8 F).

Reviews of airlines servicing Key West

Get a feel of what it's like to fly with Delta, United Airlines and American Airlines from Seattle to Key West by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,897 reviews

Reviews

1 / 20

2.0

Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Delta

8.0

Very good

7,897 reviews

Delta

8.0

Very good

7,897 reviews

Reviews

1 / 20

2.0

Mediocre

Joseph,Aug 2023

MSP - MCO

United Airlines

7.4

Good

8,619 reviews

Delta

8.0

Very good

7,897 reviews

Reviews

1 / 20

2.0

Mediocre

Joseph,Aug 2023

MSP - MCO

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,897 reviews

Reviews

1 / 20

2.0

Mediocre

Joseph,Aug 2023

MSP - MCO

Related info for your journey

What are the cheapest airlines flying from Seattle to Key West round-trip?
Our cheapest airline available from Seattle to Key West is American Airlines. Our recent data shows that you can find tickets from as low as $427 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $487 and $587 round-trip. American Airlines is 37% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from Seattle to Key West one-way?
The cheapest airlines for a one-way flight from Seattle to Key West are United Airlines ($257), American Airlines ($279), and Delta ($708).
Can I find deals for flights from Seattle to Key West that include hotel bookings?
Yes. In addition to deals on Seattle to Key West flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Key West?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Key West.
Can I find deals for business class flights from Seattle to Key West?
Yes. Cheapflights offers flight deals from Seattle to Key West by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Key West?
Currently, August is the cheapest month in which you can book a flight from Seattle to Key West (average of $328). Flying from Seattle to Key West in March is currently the most expensive (average of $493). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Other flights to Key West

Top 3 airlines flying from Seattle to Key West

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$278	Average$507	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$383	Average$658	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$473	Average$875	FlexibilityNo cancel fee	On-timeN/A

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$178+ Cheap flights from Seattle to Key West (SEA - EYW)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/2. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to Key West with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Key West are usually found in January or February, booked 66 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Seattle to Key West

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Seattle to Key West

Cheapest flights from Seattle to Key WestExplore the most affordable flight options available from Seattle to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 3, 2025.

Explore the most affordable flight options available from Seattle to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Key West that are best for you.

Compare providers for flights from Seattle to Key West

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Key West in April.

Best time to book a flight from Seattle to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West from Seattle with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Key West

How far ahead should I book a flight from Seattle to Key West?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Key West. Price data was last updated on March 28, 2025.

What is the cheapest month to book a flight from Seattle to Key West?

What is the cheapest time of day to fly from SEA to EYW?

Find hourly flight availability from Seattle to Key West. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 3, 2025.

Rainfall in Key West by month

Plan your trip to Key West by taking into account the average rainfall totals by month.

Temperature in Key West by month

Plan your trip to Key West by taking into account the average temperature totals by month.

Reviews of airlines servicing Key West

Get a feel of what it's like to fly with Delta, United Airlines and American Airlines from Seattle to Key West by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Key West. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Seattle to Key West round-trip?

What are the cheapest airlines to fly from Seattle to Key West one-way?

Can I find deals for flights from Seattle to Key West that include hotel bookings?

How can I find direct flights from Seattle to Key West?

Can I find deals for business class flights from Seattle to Key West?

What is the cheapest month to book a flight from Seattle to Key West?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Key West

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Seattle to Key West

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Cheapest flights from Seattle to Key West
Explore the most affordable flight options available from Seattle to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 3, 2025.