$587 Cheap Swiss International Air Lines flights Denver (DEN) to Kos (KGS)

View $587 flight on Sun, Oct 19, 2025Opens in a new window

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$587 Cheap Swiss International Air Lines flights Denver (DEN) to Kos (KGS)

Prices were available within the past 7 days and start at $587 for one-way flights and $788 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Mon, Aug 25 - Tue, Sep 9
DEN
Denver
KGS
Kos
$788 Roundtrip, found 6 days ago
$788
Roundtrip
found 6 days ago
Select Swiss International Air Lines flight, departing Mon, Aug 25 from Denver to Kos, returning Tue, Sep 9, priced at $788 found 6 days ago
Swiss International Air Lines
Mon, Sep 22 - Wed, Oct 8
DEN
Denver
KGS
Kos
$880 Roundtrip, found 15 hours ago
$880
Roundtrip
found 15 hours ago
Select Swiss International Air Lines flight, departing Mon, Sep 22 from Denver to Kos, returning Wed, Oct 8, priced at $880 found 15 hours ago
Swiss International Air Lines
Mon, Sep 22 - Wed, Oct 8
DEN
Denver
KGS
Kos
$920 Roundtrip, found 15 hours ago
$920
Roundtrip
found 15 hours ago
Select Swiss International Air Lines flight, departing Mon, Sep 22 from Denver to Kos, returning Wed, Oct 8, priced at $920 found 15 hours ago
Flights from Denver (DEN) to Kos (KGS)
Origin airport
Denver Intl.
Destination airport
Kos Island Intl.
Airlines serving
Austrian Airlines, Brussels Airlines, Lufthansa, Swiss International Air Lines
Popular airline
Swiss International Air Lines
Distance
6319 mi

Frequently asked questions

How much is a SWISS flight from Denver Intl. Airport (DEN) to Kos Island Intl. Airport (KGS)?
Landing cheap one-way SWISS flights from DEN to KGS from $587 on Expedia is easy --- just filter by "Price (lowest to highest)." Alternatively, check out our affordable return fares from $788 for your next adventure.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from DEN to KGS with SWISS?
Browse for one-way or round-trip flights to Kos in December or February. You could find cheaper fares with SWISS during these off-season months.
What is the cheapest time to book flights from Denver Intl. Airport (DEN) to Kos Island Intl. Airport (KGS) with SWISS?
Look for SWISS flights from DEN to KGS about one month before you want to go. The most affordable time to reserve an international flight is generally 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. Regardless of fare class or itinerary, the best day to book international airfare is usually Sunday. Friday can be the most expensive. Passengers booking on a Sunday can save an average of 17% compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does SWISS fly nonstop from Denver Intl. Airport (DEN) to Kos Island Intl. Airport (KGS)?
Simply enter your dates, click search and check the "Nonstop" filter on Expedia to find any direct flights from DEN to KGS with SWISS or another airline.
What is the earliest SWISS flight from DEN to KGS?
Browse SWISS's earliest flights from DEN to KGS by selecting our "Early Morning" and "Morning" filters. Not only will you arrive sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does SWISS fly into in Kos?
Kos Island Intl. Airport (KGS) is the primary Kos hub for SWISS flights from Denver Intl. Airport (DEN).
What kind of luggage can I take on a SWISS flight from Denver Intl. Airport (DEN) to Kos Island Intl. Airport (KGS)?
SWISS allows travelers to bring 1 checked-in bag weighing up to 50 lb with dimensions not exceeding 62 inches on standard economy flights from DEN to KGS. You can also take 1 cabin bag with you in the cabin. This carry-on luggage must not exceed 22 inches x 21 inches x 5 inches and weigh less than 17 lb. Baggage rules can differ depending on the fare type and cabin class, so double-check your booking or SWISS's website to avoid paying additional fees at the airport.
Why fly with SWISS from DEN to KGS?
Flying from DEN to KGS with SWISS means enjoying a host of benefits, including a 4-star airline rating and a rewarding loyalty program. Plus, when booking through Expedia, One Key™ members can collect OneKeyCash™* to use on select future travel purchases. That's on top of the Swiss Miles & More points you can earn with SWISS.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my SWISS flight from Denver Intl. Airport (DEN) to Kos Island Intl. Airport (KGS)?
In most cases, you can modify or cancel your flight, although additional fees may apply if you made your booking over 24 hours ago. Want to keep your options open? Make use of Expedia's "No cancel fee" or "Changes included" filter to find flights that won't penalize you if you have to alter your plans. To modify your itinerary, visit "Trips," select your flight and click on "Manage Booking" for more information.

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*Available to One Key members.