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Kos

$778+ Cheap flights from Seattle (SEA) to Kos (KGS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KGS
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Seattle to Kos

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Kos (KGS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 29, 2025.

Round-trip from

$778
(Trip.com)
From Seattle/Tacoma Intl to Kos
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Find flight deals from Seattle to Kos

Cheapest flights from Seattle to Kos
Explore the most affordable flight options available from Seattle to Kos. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Trip.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/273:00 pmSEA - KGS
2 stops21h 15mMultiple Airlines
Sun 11/99:45 pmKGS - SEA
2 stops48h 25mMultiple Airlines
Deal found 7/27$778
This SWISS deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/173:28 pmSEA - KGS
2 stops37h 02mSWISS
Tue 10/218:30 pmKGS - SEA
2 stops36h 00mSWISS
Deal found 7/28$1,615

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Kos that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
Use the filters below to find and compare flights from Seattle to Kos that are best for you.

Fly from

Seattle

Fly to

Kos

Route

Depart

Return

Price

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 10/27

3:00 pm-9:15 pm

2 stops21h 15m

Kos

Sun 11/9

9:45 pm-12:10 pm

2 stops48h 25m

$778

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 10/17

3:28 pm-2:30 pm

2 stops37h 02m

Kos

Tue 10/21

8:30 pm-10:30 pm

2 stops36h 00m

$1,615

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from Seattle to Kos

Have a flexible travel schedule? Discover the best time to fly to Kos 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.

Reviews of airlines servicing Kos

Get insights into the airlines that provide service to Kos. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Kos. Reviews last updated July 29, 2025.
Read through reviews of airlines operating flights from Seattle to Kos, such as SWISS. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
SWISS
7.5
Good
1,683 reviews

Boarding

7.7

Overall

7.5

Entertainment

6.8

Comfort

7.4

Crew

8.2

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

ZRH - ATH

The website is difficult to navigate. You pay for everything. The carry on baggage policy is complicated. The food choices were poor and the seat was uncomfortable.
SWISS
7.5
Good
1,683 reviews
SWISS
7.5
Good
1,683 reviews

Boarding

7.7

Overall

7.5

Entertainment

6.8

Comfort

7.4

Crew

8.2

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

ZRH - ATH

The website is difficult to navigate. You pay for everything. The carry on baggage policy is complicated. The food choices were poor and the seat was uncomfortable.

Related info for your journey

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

  • Can I find deals for flights from Seattle to Kos that include hotel bookings?

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

  • How can I find direct flights from Seattle to Kos?

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

  • Can I find deals for business class flights from Seattle to Kos?

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

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