HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Kos

$1,406+ Cheap flights from Washington, D.C. (WAS) 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 6/16. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — KGS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to Kos 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.

Cheap flight deals from Washington, D.C. to Kos

Cheapest flights from Washington, D.C. to Kos
Explore the most affordable flight options available from Washington, D.C. to Kos. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1610:20 pm
IAD
-
KGS
1 stop13h 45m
Lufthansa
Wed 7/17:55 pm
KGS
-
IAD
2 stops24h 40m
Lufthansa
Deal found 1/26$1,406
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/165:25 pm
IAD
-
KGS
1 stop20h 25m
Multiple Airlines
Wed 7/18:40 pm
KGS
-
IAD
1 stop27h 05m
Multiple Airlines
Deal found 1/26$1,427
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:40 pm
IAD
-
KGS
2 stops19h 10m
Multiple Airlines
Sun 8/29:00 pm
KGS
-
IAD
1 stop25h 45m
Multiple Airlines
Deal found 1/26$1,435
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/45:15 pm
IAD
-
KGS
1 stop21h 45m
Multiple Airlines
Thu 7/304:00 pm
KGS
-
IAD
2 stops30h 05m
Multiple Airlines
Deal found 1/28$1,485
This SmartFares deal was found by Cheapflights users on 1/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:35 pm
IAD
-
KGS
1 stop19h 10m
Brussels Airlines
Thu 7/3011:25 am
KGS
-
IAD
1 stop33h 05m
Brussels Airlines
Deal found 1/28$1,523
This Gurufare deal was found by Cheapflights users on 1/28. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:20 pm
IAD
-
KGS
1 stop11h 50m
SWISS
Thu 7/3011:00 am
KGS
-
IAD
1 stop36h 45m
SWISS
Deal found 1/28$1,535
This Expedia deal was found by Cheapflights users on 1/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/54:10 pm
IAD
-
KGS
2 stops20h 35m
Multiple Airlines
Thu 7/3011:00 am
KGS
-
IAD
1 stop36h 45m
Multiple Airlines
Deal found 1/28$1,558
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:15 pm
IAD
-
KGS
1 stop20h 00m
Multiple Airlines
Thu 7/309:55 am
KGS
-
IAD
2 stops32h 40m
Multiple Airlines
Deal found 1/28$1,578
This KAYAK deal was found by Cheapflights users on 1/28. 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.
Thu 6/46:30 pm
IAD
-
KGS
2 stops19h 20m
Austrian Airlines
Thu 7/307:25 pm
KGS
-
IAD
2 stops25h 55m
Austrian Airlines
Deal found 1/28$1,733
This KAYAK deal was found by Cheapflights users on 1/26. 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.
Wed 7/81:44 pm
DCA
-
KGS
2 stops15h 51m
Multiple Airlines
Sun 8/212:35 pm
KGS
-
DCA
2 stops17h 35m
Multiple Airlines
Deal found 1/26$1,918
This British Airways deal was found by Cheapflights users on 1/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/56:15 am
DCA
-
KGS
2 stops23h 50m
British Airways
Thu 7/309:45 pm
KGS
-
DCA
2 stops27h 18m
British Airways
Deal found 1/28$2,310

Find flight deals from Washington, D.C. to Kos

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 January 29, 2026.

Round-trip from

$1,406
(Cheapflightsfares)
From Washington, D.C. (WAS) to Kos
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 January 29, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Kos that are best for you.

Fly from

Washington, D.C.

Fly to

Kos

Route

Depart

Return

Price

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 6/16

10:20 pm-7:05 pm

1 stop13h 45m

Kos

Wed 7/1

7:55 pm-1:35 pm

2 stops24h 40m

$1,406

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 6/16

5:25 pm-8:50 pm

1 stop20h 25m

Kos

Wed 7/1

8:40 pm-4:45 pm

1 stop27h 05m

$1,427

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Wed 7/8

8:40 pm-10:50 pm

2 stops19h 10m

Kos

Sun 8/2

9:00 pm-3:45 pm

1 stop25h 45m

$1,435

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Thu 6/4

5:15 pm-10:00 pm

1 stop21h 45m

Kos

Thu 7/30

4:00 pm-3:05 pm

2 stops30h 05m

$1,485

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Fri 6/5

5:35 pm-7:45 pm

1 stop19h 10m

Kos

Thu 7/30

11:25 am-1:30 pm

1 stop33h 05m

$1,523

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Thu 6/4

8:20 pm-3:10 pm

1 stop11h 50m

Kos

Thu 7/30

11:00 am-4:45 pm

1 stop36h 45m

$1,535

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Sat 6/6

5:15 pm-8:15 pm

1 stop20h 00m

Kos

Thu 7/30

9:55 am-11:35 am

2 stops32h 40m

$1,578

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Fri 6/5

8:20 pm-5:30 pm

2 stops14h 10m

Kos

Thu 7/30

6:00 am-3:30 pm

2 stops16h 30m

$1,694

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Sun 3/22

11:15 am-4:10 pm

2 stops22h 55m

Kos

Thu 3/26

12:35 pm-9:00 am

2 stops26h 25m

$1,858

Washington, D.C.Kos

DCA - KGS

DCAKGS

Washington, D.C. Reagan-National

Wed 7/8

1:44 pm-12:35 pm

2 stops15h 51m

Kos

Sun 8/2

12:35 pm-11:10 pm

2 stops17h 35m

$1,918

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 12 results
1
2

Best time to book a flight from Washington, D.C. to Kos

Have a flexible travel schedule? Discover the best time to fly to Kos from Washington, D.C. 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, D.C. 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, D.C. 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, D.C.?

    Kos (KGS) is the airport you will fly into if you book a flight from Washington, D.C. to Kos. You should not have trouble finding flights to Kos from Washington, D.C.; the airport handles an average of 0 inbound flights from Washington, D.C. per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Kos airport from Washington, D.C.. It is only a 12.8 mi journey from Kos (KGS) to Kos’s city center.

  • How long is the flight from Washington, D.C. to Kos?

    There are many flights that can get you from Washington, D.C. to Kos in 13h 45m. Fly via Lufthansa, Brussels Airlines, or British Airways to get the fastest option. Airlines will cover a distance of 5336 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Washington, D.C. to Kos?

    The most popular route from Washington, D.C. to Kos is Washington, D.C. Dulles Intl - Kos. You may also consider Washington, D.C. Reagan-National - Kos or Baltimore/Washington - Kos.

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

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

  • How can I find direct flights from Washington, D.C. to Kos?

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

  • Can I find deals for business class flights from Washington, D.C. to Kos?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.