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Cheap flights from Seattle to Kos from $713

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Kos departing on 5/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Kos

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
6:50 pm - 8:50 am
SEA
-
KGS
52h 00m
2 stops
Lufthansa Logo
1:30 pm - 7:00 pm
KGS
-
SEA
39h 30m
2 stops
$1,121Lufthansa
Wed, Apr 29 - Wed, May 6
Lufthansa Logo
6:50 pm - 8:50 am
SEA
-
KGS
52h 00m
2 stops
Lufthansa Logo
1:30 pm - 12:20 pm
KGS
-
SEA
32h 50m
1 stop
$1,122Lufthansa
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
2:10 pm - 6:45 pm
SEA
-
KGS
18h 35m
2 stops
Multiple Airlines Logo
11:25 am - 9:08 pm
KGS
-
SEA
43h 43m
2 stops
$1,158Multiple Airlines
Sun, Apr 26 - Sun, May 3
Multiple Airlines Logo
10:30 am - 7:55 pm
SEA
-
KGS
23h 25m
2 stops
Multiple Airlines Logo
6:00 am - 4:59 pm
KGS
-
SEA
20h 59m
2 stops
$1,261Multiple Airlines
Tue, May 19 - Tue, May 26
Multiple Airlines Logo
3:40 pm - 6:55 pm
SEA
-
KGS
17h 15m
2 stops
Multiple Airlines Logo
11:10 am - 3:40 pm
KGS
-
SEA
38h 30m
1 stop
$1,266Multiple Airlines
Tue, Apr 28 - Tue, May 5
Multiple Airlines Logo
7:00 am - 12:40 pm
SEA
-
KGS
19h 40m
2 stops
Multiple Airlines Logo
6:05 pm - 12:20 pm
KGS
-
SEA
28h 15m
2 stops
$1,302Multiple Airlines
Tue, Apr 28 - Tue, May 5
Multiple Airlines Logo
7:10 pm - 10:05 pm
SEA
-
KGS
40h 55m
2 stops
Multiple Airlines Logo
9:00 pm - 5:10 pm
KGS
-
SEA
30h 10m
1 stop
$1,353Multiple Airlines
Sun, Apr 26 - Sun, May 3
Multiple Airlines Logo
6:50 pm - 12:35 am
SEA
-
KGS
19h 45m
2 stops
Multiple Airlines Logo
7:35 pm - 10:42 pm
KGS
-
SEA
37h 07m
3 stops
$1,378Multiple Airlines
Sun, Mar 29 - Mon, Apr 13
Multiple Airlines Logo
6:50 pm - 12:35 am
SEA
-
KGS
19h 45m
2 stops
Multiple Airlines Logo
7:20 pm - 12:20 pm
KGS
-
SEA
27h 00m
2 stops
$1,441Multiple Airlines
Sun, Mar 29 - Mon, Apr 13
Multiple Airlines Logo
6:50 pm - 8:55 am
SEA
-
KGS
28h 05m
2 stops
Multiple Airlines Logo
6:00 am - 4:59 pm
KGS
-
SEA
20h 59m
2 stops
$1,498Multiple Airlines
Sat, Jul 18 - Thu, Jul 23

Lufthansa flights from Seattle to Kos

Our best Lufthansa deals on Seattle to Kos flight tickets
Lufthansa
Apr 29
SEA6:50 pmSeattle/Tacoma Intl
52h 00m
2 stops
KGS8:50 amKos
May 6
KGS1:30 pmKos
39h 30m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$1,121
Lufthansa
Apr 29
SEA6:50 pmSeattle/Tacoma Intl
52h 00m
2 stops
KGS8:50 amKos
May 6
KGS1:30 pmKos
32h 50m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$1,122

SWISS flights from Seattle to Kos

Our best SWISS deals on Seattle to Kos flight tickets
SWISS
Apr 5
SEA7:00 amSeattle/Tacoma Intl
25h 45m
2 stops
KGS6:45 pmKos
Apr 11
KGS8:45 pmKos
35h 57m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,528
SWISS
Apr 4
SEA10:48 amSeattle/Tacoma Intl
45h 57m
2 stops
KGS6:45 pmKos
Apr 11
KGS8:45 pmKos
32h 15m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$1,558
SWISS
Apr 3
SEA7:00 amSeattle/Tacoma Intl
27h 00m
2 stops
KGS8:00 pmKos
Apr 11
KGS8:45 pmKos
35h 57m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,730

momondo 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, momondo users made 832,500 searches. Data last updated March 17, 2026.
Use the filters below to find and compare flights from Seattle to Kos that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 4/29

6:50 pm-8:50 am

2 stops52h 00m

Kos

Wed 5/6

1:30 pm-7:00 pm

2 stops39h 30m

$1,121

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Wed 4/29

6:50 pm-8:50 am

2 stops52h 00m

Kos

Wed 5/6

1:30 pm-12:20 pm

1 stop32h 50m

$1,122

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 4/26

2:10 pm-6:45 pm

2 stops18h 35m

Kos

Sun 5/3

11:25 am-9:08 pm

2 stops43h 43m

$1,158
Quickest round-trip

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Tue 5/19

10:30 am-7:55 pm

2 stops23h 25m

Kos

Tue 5/26

6:00 am-4:59 pm

2 stops20h 59m

$1,261

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Tue 4/28

3:40 pm-6:55 pm

2 stops17h 15m

Kos

Tue 5/5

11:10 am-3:40 pm

1 stop38h 30m

$1,266

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Tue 4/28

7:00 am-12:40 pm

2 stops19h 40m

Kos

Tue 5/5

6:05 pm-12:20 pm

2 stops28h 15m

$1,302

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 4/26

7:10 pm-10:05 pm

2 stops40h 55m

Kos

Sun 5/3

9:00 pm-5:10 pm

1 stop30h 10m

$1,353

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 3/29

6:50 pm-12:35 am

2 stops19h 45m

Kos

Mon 4/13

7:35 pm-10:42 pm

3 stops37h 07m

$1,378

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 3/29

6:50 pm-12:35 am

2 stops19h 45m

Kos

Mon 4/13

7:20 pm-12:20 pm

2 stops27h 00m

$1,441

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sat 7/18

6:50 pm-8:55 am

2 stops28h 05m

Kos

Thu 7/23

6:00 am-4:59 pm

2 stops20h 59m

$1,498

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
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When to book flights from Seattle to Kos

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

Cheap Seattle to Kos (SEA to KGS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Kos

Fastest flight time

19h 45m

Direct flights

None
The fastest flight from Seattle to Kos takes 19h 45m
There are no direct flights from Seattle to Kos. There are no popular flight routes from Seattle to Kos.
Search flight deals

  • How far is Seattle/Tacoma Intl to Kos by plane?

    There are 6300.1 mi between Seattle/Tacoma Intl and Kos. In terms of flight time, this usually takes a little over 19h 45m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Kos Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Kos Airport were last updated today.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport 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 Seattle/Tacoma Intl Airport to Kos Airport.

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

    The travel and health documents you'll need for your trip to Kos Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Kos Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Seattle to Kos?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Seattle from Kos. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Seattle 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?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

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 Seattle to Kos?

Finding the right flight to Kos from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Kos quick and easy, saving you time and money.

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

Flights from Seattle to Kos with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Kos from Seattle.

I’m not ready to book a flight from Seattle to Kos right now. Can momondo alert me if prices change?

Price alerts on flights to Kos from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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