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Cheap flights from Washington, D.C. to Kos from $641

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Kos departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. to Kos

Cheap round-trip flights

SWISS Logo
8:45 pm - 7:55 pmIAD-KGS
16h 10m1 stop
SWISS Logo
11:00 am - 4:15 pmKGS-IAD
36h 15m1 stop
$641SWISS
Find Deal
Tue, Aug 19 - Mon, Aug 25
Lufthansa Logo
10:20 pm - 7:05 pmIAD-KGS
13h 45m1 stop
Lufthansa Logo
12:40 pm - 9:19 pmKGS-IAD
39h 39m2 stops
$667Lufthansa
Find Deal
Tue, Aug 19 - Mon, Aug 25
Lufthansa Logo
5:16 pm - 7:05 pmIAD-KGS
18h 49m2 stops
Lufthansa Logo
12:40 pm - 9:19 pmKGS-IAD
39h 39m2 stops
$672Lufthansa
Find Deal
Tue, Aug 19 - Mon, Aug 25
SWISS Logo
8:45 pm - 7:40 pmIAD-KGS
15h 55m1 stop
SWISS Logo
11:00 am - 4:15 pmKGS-IAD
36h 15m1 stop
$727SWISS
Find Deal
Mon, Aug 18 - Mon, Aug 25
SWISS Logo
8:45 pm - 7:40 pmIAD-KGS
15h 55m1 stop
SWISS Logo
11:00 am - 4:15 pmKGS-IAD
36h 15m1 stop
$728SWISS
Find Deal
Mon, Aug 18 - Mon, Aug 25
Lufthansa Logo
10:20 pm - 7:05 pmIAD-KGS
13h 45m1 stop
Lufthansa Logo
12:40 pm - 9:19 pmKGS-IAD
39h 39m2 stops
$754Lufthansa
Find Deal
Tue, Aug 19 - Mon, Aug 25
Logo
8:45 pm - 7:40 pmIAD-KGS
15h 55m1 stop
Logo
12:40 pm - 1:30 pmKGS-IAD
31h 50m2 stops
$763
Find Deal
Mon, Aug 18 - Mon, Aug 25
Logo
8:45 pm - 7:40 pmIAD-KGS
15h 55m1 stop
Logo
12:40 pm - 1:30 pmKGS-IAD
31h 50m2 stops
$764
Find Deal
Mon, Aug 18 - Mon, Aug 25
Austrian Airlines Logo
5:45 pm - 8:00 pmIAD-KGS
19h 15m2 stops
Austrian Airlines Logo
10:00 am - 3:52 pmKGS-IAD
60h 52m2 stops
$948Austrian Airlines
Find Deal
Sun, Sep 14 - Sun, Sep 21
Austrian Airlines Logo
5:25 pm - 8:00 pmIAD-KGS
19h 35m1 stop
Austrian Airlines Logo
10:00 am - 2:35 pmKGS-IAD
35h 35m1 stop
$4,465Austrian Airlines
Find Deal
Sun, Sep 14 - Sun, Sep 21

Austrian Airlines flights from Washington, D.C. to Kos

Our best Austrian Airlines deals on Washington, D.C. to Kos flight tickets
Austrian Airlines
Sep 14
IAD5:45 pmWashington, D.C. Dulles Intl
19h 15m
2 stops
KGS8:00 pmKos
Sep 21
KGS10:00 amKos
60h 52m
2 stops
IAD3:52 pmWashington, D.C. Dulles Intl
$948
Find similar
Austrian Airlines
Sep 14
IAD5:25 pmWashington, D.C. Dulles Intl
19h 35m
1 stop
KGS8:00 pmKos
Sep 21
KGS10:00 amKos
35h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$4,465
Find similar

SWISS flights from Washington, D.C. to Kos

Our best SWISS deals on Washington, D.C. to Kos flight tickets
SWISS
Aug 19
IAD8:45 pmWashington, D.C. Dulles Intl
16h 10m
1 stop
KGS7:55 pmKos
Aug 25
KGS11:00 amKos
36h 15m
1 stop
IAD4:15 pmWashington, D.C. Dulles Intl
$641
Find similar
SWISS
Aug 18
IAD8:45 pmWashington, D.C. Dulles Intl
15h 55m
1 stop
KGS7:40 pmKos
Aug 25
KGS11:00 amKos
36h 15m
1 stop
IAD4:15 pmWashington, D.C. Dulles Intl
$727
Find similar
SWISS
Aug 18
IAD8:45 pmWashington, D.C. Dulles Intl
15h 55m
1 stop
KGS7:40 pmKos
Aug 25
KGS11:00 amKos
36h 15m
1 stop
IAD4:15 pmWashington, D.C. Dulles Intl
$728
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Kos that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 8/19

8:45 pm-7:55 pm

1 stop16h 10m

Kos

Mon 8/25

11:00 am-4:15 pm

1 stop36h 15m

$641

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 8/19

10:20 pm-7:05 pm

1 stop13h 45m

Kos

Mon 8/25

12:40 pm-9:19 pm

2 stops39h 39m

$667

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 8/19

5:16 pm-7:05 pm

2 stops18h 49m

Kos

Mon 8/25

12:40 pm-9:19 pm

2 stops39h 39m

$672

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Mon 8/18

8:45 pm-7:40 pm

1 stop15h 55m

Kos

Mon 8/25

11:00 am-4:15 pm

1 stop36h 15m

$727

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Mon 8/18

8:45 pm-7:40 pm

1 stop15h 55m

Kos

Mon 8/25

11:00 am-4:15 pm

1 stop36h 15m

$728

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Tue 8/19

10:20 pm-7:05 pm

1 stop13h 45m

Kos

Mon 8/25

12:40 pm-9:19 pm

2 stops39h 39m

$754

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Mon 8/18

8:45 pm-7:40 pm

1 stop15h 55m

Kos

Mon 8/25

12:40 pm-1:30 pm

2 stops31h 50m

$763

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Mon 8/18

8:45 pm-7:40 pm

1 stop15h 55m

Kos

Mon 8/25

12:40 pm-1:30 pm

2 stops31h 50m

$764

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Sun 9/14

5:45 pm-8:00 pm

2 stops19h 15m

Kos

Sun 9/21

10:00 am-3:52 pm

2 stops60h 52m

$948

Washington, D.C.Kos

IAD - KGS

IADKGS

Washington, D.C. Dulles Intl

Sun 9/14

5:25 pm-8:00 pm

1 stop19h 35m

Kos

Sun 9/21

10:00 am-2:35 pm

1 stop35h 35m

$4,465

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Kos from

How to get the cheapest flight ticket from Washington, D.C. to Kos

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

What is the cheapest day to depart on your flight to Kos?

The cheapest day to depart from Washington, D.C. to Kos is on a Tuesday when prices can be found for as low as $1,026. On the other hand, Sunday is the most expensive day to depart from Washington, D.C. because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,792.

What is the cheapest time of day to depart on your flight to Kos?

Flying to Kos from Washington, D.C. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,310 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,792 on average. Flights to Kos from Washington, D.C. in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Washington, D.C. to Kos

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Kos according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Kos (WAS to KGS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Kos

Best Price Found

$641

Fastest flight time

13h 45m

Direct flights

None

Airports in Kos

1 airport
The best flight deal from Washington, D.C. to Kos found on momondo in the last 72 hours is $641
The fastest flight from Washington, D.C. to Kos takes 13h 45m
There are no direct flights from Washington, D.C. to Kos. Popular non-direct routes for this connection are Washington, D.C. Reagan-National Airport - Kos Airport, Baltimore/Washington Airport - Kos Airport and Washington, D.C. Dulles Intl Airport - Kos Airport.
There is 1 airport near Kos: Kos (KGS)
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  • How far is Washington, D.C. to Kos by plane?

    A flight from Washington, D.C. to Kos will travel around 5324.1 mi. Typically, this will take 13h 45m by plane in normal conditions.

  • When did momondo last update prices for flights from Washington, D.C. to Kos Airport?

    Prices for flights from Washington, D.C. to Kos Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. to Kos Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Kos Airport.

  • What documentation or ID do you need to fly to Kos Airport?

    The required travel and health documents for your Kos Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Kos Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Kos?

Book flights to Kos if you plan to visit one of these locations
Kardamena
Marmari

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Kos?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to Kos. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington, D.C. to Kos with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Kos from Washington, D.C. with this policy.

How can momondo help me find flights from Washington, D.C. to Kos?

momondo helps you find the best flight between Washington, D.C. and Kos 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 Washington, D.C. to Kos right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Washington, D.C. to Kos flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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