Title: Cheap Flights from Seattle (SEA) to Kos (KGS) - Expedia.ca ![Kos featuring a castle and a coastal town](https://images.trvl-media.com/place/1804/71d210e5-8360-4faf-8e0e-489f0841a4ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Seattle (SEA) to Kos (KGS) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Seattle-Tacoma International Airport (SEA) to Kos (KGS-Kos Island Intl.) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:kgs,departure:27/10/2025TANYT&leg2=from:kgs,to:sea,departure:03/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![Swiss International Air Lines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LX.svg) Swiss International Air Lines [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:kgs,departure:27/10/2025TANYT&leg2=from:kgs,to:sea,departure:03/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LX"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Frequently asked questions ### How much is a flight from Sea-Tac Airport to Kos Island Intl. Airport (KGS)? > Within the past 7 days on Expedia, for flights departing within the next year, the lowest price quoted for a round-trip journey from SEA to Kos Airport was . Fares this good don't last long, so make sure you book yours today. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Seattle - Tacoma Intl. Airport (SEA) to Kos Airport? > Every air carrier has its own terms and conditions. If you do decide to cancel, follow the easy instructions on our [Customer Service Portal](https://www.expedia.ca/helpcenter). ### How do I find cheap flights from SEA to Kos Island Intl. Airport (KGS) that have flexible change policies? > Plenty of carriers offer the option to reschedule your flight without a change fee. All you pay is the cost difference between the two flights. When searching for Sea-Tac Airport to Kos Airport flights, you'll find a "No change fees" filter for you to select. ### How far is the flight from Sea-Tac Airport to KGS? > You'll have 10,200 kilometres to cover on the long-haul SeaTac to Kos route. Dress in layers of comfortable clothes and consider taking a pair of noise-cancelling headphones. ### Which airlines fly direct from SEA to Kos Airport? > At present, no airlines offer direct flights from SEA to Kos Island Intl. Airport (KGS). You'll need to book a flight with one or more stops. To get the best connections and price, lock in your fare ahead of time. ### Are Seattle - Tacoma Intl. Airport (SEA) to KGS flight tickets cheaper when they're purchased at the last minute? > Booking your trip from Sea-Tac Airport to KGS at the last minute could be your ticket to an awesome deal. However, you might miss out on a flight altogether! If you'd rather avoid the risk, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to a year in advance. If your preferred air carrier hasn't released tickets yet, check back regularly as deals are updated on Expedia all the time. ## Travel information | Origin airport | Seattle - Tacoma Intl. | | --- | --- | | Destination airport | Kos Island Intl. | | Distance | 10106 km | ## Book with confidence ### Seattle to Kos Flights **The easy way to book your flights from Seattle to Kos**  With Expedia, it’s simple to find and book flights to Kos from Seattle whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to Kos Island Intl., too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Seattle to Kos today, tomorrow, or this week.   **Save dollars with cheap flights from Seattle - Tacoma Intl., SEA to Kos Island Intl., KGS**  Sort your search results by price to find great deals on your flight from Seattle to Kos—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Kos from Seattle currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Kos   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to Kos from Seattle**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Kos with Expedia today. ## Explore a world of travel with Expedia - Flights - [Flights from Vernon to Kos](https://www.expedia.ca/lp/flights/10619/1804/vernon-to-kos) - [Flights from Emerald to Kos](https://www.expedia.ca/lp/flights/1137/1804/emerald-to-kos) - [Flights from Garissa to Kos](https://www.expedia.ca/lp/flights/1279/1804/garissa-to-kos) - [Flights from Negage to Kos](https://www.expedia.ca/lp/flights/1411/1804/negage-to-kos) - [Flights from Igarka to Kos](https://www.expedia.ca/lp/flights/1552/1804/igarka-to-kos) - [Flights from Naxos to Kalymnos](https://www.expedia.ca/lp/flights/1716/6143137/naxos-to-kalymnos) - [Flights from Skiathos to Kalymnos](https://www.expedia.ca/lp/flights/1729/6143137/skiathos-to-kalymnos) - [Flights from Xianyang to Kalymnos](https://www.expedia.ca/lp/flights/177812/6143137/xianyang-to-kalymnos) - [Flights from Santorini to Kos](https://www.expedia.ca/lp/flights/177970/1804/santorini-to-kos) - [Flights from Athens to Kalymnos](https://www.expedia.ca/lp/flights/178231/6143137/athens-to-kalymnos) - 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