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Cheap flights from Seattle to Kos from $1,125

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Kos departing on 9/11. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to Kos

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:50 pm - 7:45 pm
SEA
-
KGS
14h 55m
1 stop
Multiple Airlines Logo
9:40 pm - 8:18 pm
KGS
-
SEA
32h 38m
2 stops
$1,125Multiple Airlines
Fri, Sep 11 - Fri, Sep 18
Multiple Airlines Logo
3:55 pm - 12:35 am
SEA
-
KGS
22h 40m
3 stops
Multiple Airlines Logo
1:05 pm - 1:45 pm
KGS
-
SEA
34h 40m
3 stops
$1,155Multiple Airlines
Fri, Sep 11 - Fri, Sep 18
Condor Logo
6:00 pm - 6:45 pm
SEA
-
KGS
14h 45m
1 stop
Condor Logo
11:10 am - 4:00 pm
KGS
-
SEA
14h 50m
1 stop
$1,159Condor
Fri, Sep 11 - Fri, Sep 18
Multiple Airlines Logo
8:00 am - 7:35 pm
SEA
-
KGS
25h 35m
2 stops
Multiple Airlines Logo
9:40 pm - 8:18 pm
KGS
-
SEA
32h 38m
2 stops
$1,160Multiple Airlines
Fri, Sep 11 - Fri, Sep 18
Multiple Airlines Logo
3:55 pm - 7:45 pm
SEA
-
KGS
17h 50m
2 stops
Multiple Airlines Logo
9:00 pm - 1:45 pm
KGS
-
SEA
26h 45m
3 stops
$1,305Multiple Airlines
Fri, Sep 11 - Fri, Sep 18
Emirates Logo
5:15 pm - 5:35 pm
SEA
-
KGS
38h 20m
2 stops
Emirates Logo
1:05 pm - 1:25 pm
KGS
-
SEA
34h 20m
2 stops
$1,830Emirates
Sun, Oct 4 - Thu, Oct 8
Emirates Logo
5:15 pm - 5:35 pm
SEA
-
KGS
62h 20m
2 stops
Emirates Logo
6:05 pm - 1:25 pm
KGS
-
SEA
53h 20m
2 stops
$1,831Emirates
Sun, Oct 4 - Thu, Oct 8
British Airways Logo
8:20 pm - 1:15 pm
SEA
-
KGS
30h 55m
1 stop
British Airways Logo
3:00 pm - 10:00 pm
KGS
-
SEA
40h 00m
2 stops
$3,078British Airways
Thu, Oct 1 - Thu, Oct 29
Multiple Airlines Logo
6:50 pm - 8:50 pm
SEA
-
KGS
16h 00m
2 stops
Multiple Airlines Logo
12:00 pm - 2:00 pm
KGS
-
SEA
35h 00m
2 stops
$3,232Multiple Airlines
Thu, Oct 1 - Thu, Oct 29
British Airways Logo
8:20 pm - 1:15 pm
SEA
-
KGS
30h 55m
1 stop
British Airways Logo
3:00 pm - 5:50 pm
KGS
-
SEA
35h 50m
1 stop
$3,888British Airways
Thu, Oct 1 - Thu, Oct 29

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Emirates flights from Seattle to Kos

Our best Emirates deals on Seattle to Kos flight tickets
Emirates
Oct 4
SEA5:15 pmSeattle/Tacoma Intl
38h 20m
2 stops
KGS5:35 pmKos
Oct 8
KGS1:05 pmKos
34h 20m
2 stops
SEA1:25 pmSeattle/Tacoma Intl
$1,830
Emirates
Oct 4
SEA5:15 pmSeattle/Tacoma Intl
62h 20m
2 stops
KGS5:35 pmKos
Oct 8
KGS6:05 pmKos
53h 20m
2 stops
SEA1:25 pmSeattle/Tacoma Intl
$1,831

British Airways flights from Seattle to Kos

Our best British Airways deals on Seattle to Kos flight tickets
British Airways
Oct 1
SEA8:20 pmSeattle/Tacoma Intl
30h 55m
1 stop
KGS1:15 pmKos
Oct 29
KGS3:00 pmKos
40h 00m
2 stops
SEA10:00 pmSeattle/Tacoma Intl
$3,078
British Airways
Oct 1
SEA8:20 pmSeattle/Tacoma Intl
30h 55m
1 stop
KGS1:15 pmKos
Oct 29
KGS3:00 pmKos
35h 50m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$3,888

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 August 2, 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

Fri 9/11

6:50 pm-7:45 pm

1 stop14h 55m

Kos

Fri 9/18

9:40 pm-8:18 pm

2 stops32h 38m

$1,125

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 9/11

3:55 pm-12:35 am

3 stops22h 40m

Kos

Fri 9/18

1:05 pm-1:45 pm

3 stops34h 40m

$1,155
Quickest round-trip

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 9/11

6:00 pm-6:45 pm

1 stop14h 45m

Kos

Fri 9/18

11:10 am-4:00 pm

1 stop14h 50m

$1,159

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 9/11

8:00 am-7:35 pm

2 stops25h 35m

Kos

Fri 9/18

9:40 pm-8:18 pm

2 stops32h 38m

$1,160

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Fri 9/11

3:55 pm-7:45 pm

2 stops17h 50m

Kos

Fri 9/18

9:00 pm-1:45 pm

3 stops26h 45m

$1,305

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 10/4

5:15 pm-5:35 pm

2 stops38h 20m

Kos

Thu 10/8

1:05 pm-1:25 pm

2 stops34h 20m

$1,830

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Sun 10/4

5:15 pm-5:35 pm

2 stops62h 20m

Kos

Thu 10/8

6:05 pm-1:25 pm

2 stops53h 20m

$1,831

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Thu 10/1

8:20 pm-1:15 pm

1 stop30h 55m

Kos

Thu 10/29

3:00 pm-10:00 pm

2 stops40h 00m

$3,078

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Thu 10/1

6:50 pm-8:50 pm

2 stops16h 00m

Kos

Thu 10/29

12:00 pm-2:00 pm

2 stops35h 00m

$3,232

SeattleKos

SEA - KGS

SEAKGS

Seattle/Tacoma Intl

Thu 10/1

8:20 pm-1:15 pm

1 stop30h 55m

Kos

Thu 10/29

3:00 pm-5:50 pm

1 stop35h 50m

$3,888

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

62h 20m

Direct flights

None
The fastest flight from Seattle to Kos takes 62h 20m
There are no direct flights from Seattle to Kos. There are no popular flight routes from Seattle to Kos.
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Frequently asked questions about flying from Seattle to Kos

  • 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 62h 20m.

  • 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.

Frequently asked questions about flying from Seattle to Kos

  • 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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