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Kos

$625+ Cheap flights from Washington 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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KGS
Jan 30 — Feb 61
Fri 1/30
Fri 2/6
1 adult, Economy
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Cheap flight deals from Washington to Kos

Best flights from Washington to Kos
Discover carefully curated flight deals from Washington to Kos that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 31, 2025.

This Trip.com deal was found by Cheapflights users on 12/30. 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.
Thu 1/296:50 pmSEA - KGS
2 stops30h 40mMultiple Airlines
Thu 2/512:00 pmKGS - SEA
2 stops33h 30mMultiple Airlines
Deal found 12/30$625
This Booking.com deal was found by Cheapflights users on 12/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/63:09 pmSEA - KGS
2 stops43h 31mBritish Airways
Tue 6/162:20 pmKGS - SEA
2 stops43h 19mBritish Airways
Deal found 12/29$1,421
This KAYAK deal was found by Cheapflights users on 12/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:30 pmSEA - KGS
1 stop17h 10mSWISS
Mon 6/1511:00 amKGS - SEA
2 stops45h 29mSWISS
Deal found 12/28$1,614
This Gotogate deal was found by Cheapflights users on 12/31. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/142:00 pmSEA - KGS
2 stops44h 05mMultiple Airlines
Sat 2/214:40 pmKGS - SEA
2 stops53h 30mMultiple Airlines
Deal found 12/31$1,138
This Mytrip deal was found by Cheapflights users on 12/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/133:40 pmSEA - KGS
3 stops34h 25mMultiple Airlines
Fri 2/209:05 pmKGS - SEA
3 stops35h 01mMultiple Airlines
Deal found 12/30$1,238
This oojo deal was found by Cheapflights users on 12/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:55 pmSEA - KGS
2 stops38h 50mBritish Airways
Mon 6/159:40 pmKGS - SEA
2 stops30h 52mBritish Airways
Deal found 12/28$1,605
This Trip.com deal was found by Cheapflights users on 12/29. 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.
Sat 6/61:35 pmSEA - KGS
3 stops34h 35mMultiple Airlines
Tue 6/168:30 pmKGS - SEA
3 stops49h 05mMultiple Airlines
Deal found 12/29$1,391

Find flight deals from Washington to Kos

Keep the following information in mind while searching for Washington to Kos flight deals. Data was last updated December 31, 2025.

Round-trip from

$625
(Trip.com)
From Washington to Kos
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 December 31, 2025.
Use the filters below to find and compare flights from Washington to Kos that are best for you.

Fly from

Washington

Fly to

Kos

Route

Depart

Return

Price

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Thu 1/29

6:50 pm-11:30 am

2 stops30h 40m

Kos

Thu 2/5

12:00 pm-11:30 am

2 stops33h 30m

$625

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 2/14

2:00 pm-8:05 pm

2 stops44h 05m

Kos

Sat 2/21

4:40 pm-12:10 pm

2 stops53h 30m

$1,138

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 2/13

3:40 pm-12:05 pm

3 stops34h 25m

Kos

Fri 2/20

9:05 pm-10:06 pm

3 stops35h 01m

$1,238

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 6/6

1:35 pm-10:10 am

3 stops34h 35m

Kos

Tue 6/16

8:30 pm-11:35 am

3 stops49h 05m

$1,391

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 6/6

3:09 pm-8:40 pm

2 stops43h 31m

Kos

Tue 6/16

2:20 pm-11:39 pm

2 stops43h 19m

$1,421

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 6/1

7:55 pm-8:45 pm

2 stops38h 50m

Kos

Mon 6/15

9:40 pm-6:32 pm

2 stops30h 52m

$1,605

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 6/1

4:30 pm-7:40 pm

1 stop17h 10m

Kos

Mon 6/15

11:00 am-10:29 pm

2 stops45h 29m

$1,614

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Best time to book a flight from Washington to Kos

Have a flexible travel schedule? Discover the best time to fly to Kos from Washington 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 Washington to Kos
No data available for this route at this time. Please check back soon.

Related info for your journey

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

  • What airport do you fly into for flights to Kos from Washington?

    Located just 12.8 mi from the city center, Kos (KGS) is the airport most travelers will use when flying to Kos from Washington.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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.

See more FAQs

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