$706 Cheap Flights from Portland (PDX) to Kos (KGS)

View $706 flight on Mon, Dec 29, 2025Opens in a new window

Popular airlines from Portland International Airport (PDX) to Kos (KGS-Kos Island Intl.)

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Cheap Flights from Portland to Kos (PDX-KGS)

Prices were available within the past 7 days and start at $706 for one-way flights and $888 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Jan 1 - Sat, Jan 17
PDX
Portland
KGS
Kos
$888 Roundtrip, found 15 hours ago
$888
Roundtrip
found 15 hours ago
Select Delta flight, departing Thu, Jan 1 from Portland to Kos, returning Sat, Jan 17, priced at $888 found 15 hours ago
KLM
Sun, Jan 18 - Thu, Jan 29
PDX
Portland
KGS
Kos
$921 Roundtrip, found 15 hours ago
$921
Roundtrip
found 15 hours ago
Select KLM flight, departing Sun, Jan 18 from Portland to Kos, returning Thu, Jan 29, priced at $921 found 15 hours ago
Delta
Tue, Dec 30 - Sat, Jan 17
PDX
Portland
KGS
Kos
$988 Roundtrip, found 15 hours ago
$988
Roundtrip
found 15 hours ago
Select Delta flight, departing Tue, Dec 30 from Portland to Kos, returning Sat, Jan 17, priced at $988 found 15 hours ago
KLM
Sun, Jan 11 - Tue, Jan 20
PDX
Portland
KGS
Kos
$1,013 Roundtrip, found 15 hours ago
$1,013
Roundtrip
found 15 hours ago
Select KLM flight, departing Sun, Jan 11 from Portland to Kos, returning Tue, Jan 20, priced at $1,013 found 15 hours ago
KLM
Sun, Jan 18 - Tue, Jan 27
PDX
Portland
KGS
Kos
$1,021 Roundtrip, found 15 hours ago
$1,021
Roundtrip
found 15 hours ago
Select KLM flight, departing Sun, Jan 18 from Portland to Kos, returning Tue, Jan 27, priced at $1,021 found 15 hours ago
Delta
Thu, Dec 11 - Tue, Dec 23
PDX
Portland
KGS
Kos
$1,064 Roundtrip, found 15 hours ago
$1,064
Roundtrip
found 15 hours ago
Select Delta flight, departing Thu, Dec 11 from Portland to Kos, returning Tue, Dec 23, priced at $1,064 found 15 hours ago
KLM
Fri, Jan 9 - Tue, Jan 20
PDX
Portland
KGS
Kos
$1,073 Roundtrip, found 15 hours ago
$1,073
Roundtrip
found 15 hours ago
Select KLM flight, departing Fri, Jan 9 from Portland to Kos, returning Tue, Jan 20, priced at $1,073 found 15 hours ago
Delta
Wed, Dec 10 - Tue, Dec 23
PDX
Portland
KGS
Kos
$1,092 Roundtrip, found 15 hours ago
$1,092
Roundtrip
found 15 hours ago
Select Delta flight, departing Wed, Dec 10 from Portland to Kos, returning Tue, Dec 23, priced at $1,092 found 15 hours ago
Brussels Airlines
Fri, Apr 24 - Sun, May 10
PDX
Portland
KGS
Kos
$1,274 Roundtrip, found 5 hours ago
$1,274
Roundtrip
found 5 hours ago
Select Brussels Airlines flight, departing Fri, Apr 24 from Portland to Kos, returning Sun, May 10, priced at $1,274 found 5 hours ago
Swiss International Air Lines
Sat, Apr 4 - Thu, Apr 16
PDX
Portland
KGS
Kos
$1,601 Roundtrip, found 9 hours ago
$1,601
Roundtrip
found 9 hours ago
Select Swiss International Air Lines flight, departing Sat, Apr 4 from Portland to Kos, returning Thu, Apr 16, priced at $1,601 found 9 hours ago

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Alternative airports near Kos

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Kos Island Intl. KGS. Cheapest and Closest option available. Average driving time to city center is 25 minutes. Flights from $1,064
KGS
Kos Island Intl.
CheapestClosest
Average driving time to city center25 min
Flights from $1,064
Flights from Portland (PDX) to Kos (KGS)
Origin airport
Portland Intl.
Destination airport
Kos Island Intl.
Roundtrip price
$888
Distance
6439 mi

Portland to Kos Flights

The cheapest times to fly from Portland to Kos

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portland to Kos are during the month of January. You can find some of the cheapest flights from Portland to Kos with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Kos

Sunday is one of the best days to book for cheap flights from Portland to Kos: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portland to Kos

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portland to Kos in 2025. You can also book with separate airlines for your outbound and return journeys, from $706 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portland to Kos flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portland to Kos airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS) cost?
Secure a cheap one-way flight from $706 or cheap return flight from $888 from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS)?
January is the cheapest month to fly from PDX to KGS. Traveling outside of peak seasons is often the key to better flight prices.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS)?
To find the cheapest airline flying from PDX to KGS, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS)?
There are no daily nonstop flights from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS). But you can choose flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from PDX to KGS?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* However, this can vary based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS)?
To avoid potential delays on the Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS) route, fly before 3 PM. Later departures have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS) last-minute?
Holding off until right before your break to book a flight from PDX to KGS generally means paying more. While it's possible to find some last-minute discounts, they aren't always guaranteed. Allow some flexibility in your schedule to maximize your chances of snagging a bargain.
Is it cheaper to book a PDX to KGS flight and hotel package?
Booking a PDX to KGS flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Kos Island Intl. Airport (KGS)?
It's usually possible to reschedule or cancel your PDX to KGS flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.