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Cheap flights from Washington to Kos from $855

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 to Kos departing on 3/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Washington to Kos

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:00 am - 4:10 pm
SEA
-
KGS
23h 10m
2 stops
Multiple Airlines Logo
7:30 pm - 10:37 pm
KGS
-
SEA
37h 07m
3 stops
$855Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
8:00 am - 8:05 pm
SEA
-
KGS
27h 05m
2 stops
Multiple Airlines Logo
6:05 pm - 4:59 pm
KGS
-
SEA
56h 54m
2 stops
$863Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
8:00 am - 7:30 pm
SEA
-
KGS
26h 30m
3 stops
Multiple Airlines Logo
1:05 pm - 12:20 pm
KGS
-
SEA
33h 15m
3 stops
$1,053Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
3:35 pm - 8:50 am
SEA
-
KGS
32h 15m
3 stops
Multiple Airlines Logo
8:35 am - 8:40 pm
KGS
-
SEA
22h 05m
3 stops
$1,090Multiple Airlines
Wed, Mar 25 - Wed, Apr 1
SWISS Logo
9:55 am - 5:05 pm
SEA
-
KGS
21h 10m
2 stops
SWISS Logo
8:30 pm - 6:30 pm
KGS
-
SEA
32h 00m
2 stops
$1,203SWISS
Sat, Jun 6 - Tue, Jun 16
SWISS Logo
4:30 pm - 10:10 am
SEA
-
KGS
31h 40m
1 stop
SWISS Logo
8:30 pm - 6:30 pm
KGS
-
SEA
32h 00m
2 stops
$1,206SWISS
Sat, Jun 6 - Tue, Jun 16
Multiple Airlines Logo
4:10 pm - 8:50 am
SEA
-
KGS
31h 40m
2 stops
Multiple Airlines Logo
6:05 pm - 12:20 pm
KGS
-
SEA
28h 15m
2 stops
$1,235Multiple Airlines
Wed, Mar 25 - Wed, Apr 1
Multiple Airlines Logo
3:40 pm - 8:50 am
SEA
-
KGS
32h 10m
3 stops
Multiple Airlines Logo
7:45 pm - 12:20 pm
KGS
-
SEA
26h 35m
2 stops
$1,515Multiple Airlines
Wed, Mar 25 - Wed, Apr 1
Emirates Logo
4:05 pm - 5:05 pm
SEA
-
KGS
39h 00m
2 stops
Emirates Logo
2:20 pm - 1:35 pm
KGS
-
SEA
56h 15m
2 stops
$2,193Emirates
Wed, Mar 4 - Sun, Mar 8
Emirates Logo
4:05 pm - 5:05 pm
SEA
-
KGS
39h 00m
2 stops
Emirates Logo
2:20 pm - 12:35 pm
KGS
-
SEA
56h 15m
2 stops
$2,253Emirates
Wed, Feb 25 - Sun, Mar 1

SWISS flights from State of Washington to Kos

Our best SWISS deals on State of Washington to Kos flight tickets
SWISS
Jun 6
SEA9:55 amSeattle/Tacoma Intl
21h 10m
2 stops
KGS5:05 pmKos
Jun 16
KGS8:30 pmKos
32h 00m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$1,203
SWISS
Jun 6
SEA4:30 pmSeattle/Tacoma Intl
31h 40m
1 stop
KGS10:10 amKos
Jun 16
KGS8:30 pmKos
32h 00m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$1,206

Emirates flights from State of Washington to Kos

Our best Emirates deals on State of Washington to Kos flight tickets
Emirates
Mar 4
SEA4:05 pmSeattle/Tacoma Intl
39h 00m
2 stops
KGS5:05 pmKos
Mar 8
KGS2:20 pmKos
56h 15m
2 stops
SEA1:35 pmSeattle/Tacoma Intl
$2,193
Emirates
Feb 25
SEA4:05 pmSeattle/Tacoma Intl
39h 00m
2 stops
KGS5:05 pmKos
Mar 1
KGS2:20 pmKos
56h 15m
2 stops
SEA12:35 pmSeattle/Tacoma Intl
$2,253

momondo Fare Finder

 
Customize your flight search to find flights from State of 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, momondo users made 832,500 searches. Data last updated February 8, 2026.
Use the filters below to find and compare flights from Washington to Kos that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 3/23

8:00 am-4:10 pm

2 stops23h 10m

Kos

Mon 3/30

7:30 pm-10:37 pm

3 stops37h 07m

$855

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 3/23

8:00 am-8:05 pm

2 stops27h 05m

Kos

Mon 3/30

6:05 pm-4:59 pm

2 stops56h 54m

$863

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Mon 3/23

8:00 am-7:30 pm

3 stops26h 30m

Kos

Mon 3/30

1:05 pm-12:20 pm

3 stops33h 15m

$1,053

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 3/25

3:35 pm-8:50 am

3 stops32h 15m

Kos

Wed 4/1

8:35 am-8:40 pm

3 stops22h 05m

$1,090

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 6/6

9:55 am-5:05 pm

2 stops21h 10m

Kos

Tue 6/16

8:30 pm-6:30 pm

2 stops32h 00m

$1,203

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 6/6

4:30 pm-10:10 am

1 stop31h 40m

Kos

Tue 6/16

8:30 pm-6:30 pm

2 stops32h 00m

$1,206

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 3/25

4:10 pm-8:50 am

2 stops31h 40m

Kos

Wed 4/1

6:05 pm-12:20 pm

2 stops28h 15m

$1,235

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 3/25

3:40 pm-8:50 am

3 stops32h 10m

Kos

Wed 4/1

7:45 pm-12:20 pm

2 stops26h 35m

$1,515

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 3/4

4:05 pm-5:05 pm

2 stops39h 00m

Kos

Sun 3/8

2:20 pm-1:35 pm

2 stops56h 15m

$2,193

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 2/25

4:05 pm-5:05 pm

2 stops39h 00m

Kos

Sun 3/1

2:20 pm-12:35 pm

2 stops56h 15m

$2,253

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap State of Washington to Kos flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Kos

Fastest flight time

21h 10m

Direct flights

None
The fastest flight from State of Washington to Kos takes 21h 10m
There are no direct flights from State of Washington to Kos. There are no popular flight routes from State of Washington to Kos.
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  • When did momondo last update prices for flights from Washington to Kos Airport?

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

  • How old do you have to be to fly from Washington to Kos Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington 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.

  • How do I get Price Alerts for flights from State of Washington to Kos?

    Confirm your travel details to search for the latest offers for flights from State of Washington to Kos. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from State of Washington to Kos with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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 to Kos?

It is quick and easy to find Washington to Kos flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Kos that suits you.

Can I find flights from Washington to Kos with flexible booking policies on momondo?

All flight searches from Washington to Kos on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington to Kos?

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

Yes momondo offers price alerts on flights to Kos from Washington. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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