$494 Cheap Swiss International Air Lines flights Washington (IAD) to Kos (KGS)

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap SWISS return flights from $619 from IAD to KGS. Affordable one-way fares from $494 are available as well.**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.

SWISS flights to Kos are typically cheaper in the low-season months of December and February. Whether you’re after a return or one-way ticket, you could land a better deal then.

Getting the best SWISS deals from IAD to KGS is typically all about timing. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better yet, you can pocket 17% on average by buying your tickets on a Sunday compared to a Friday, which is usually the most expensive day to book.* It’s smart to kick off your flight search about one month before your travel dates.*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.

Use the “Nonstop” filter when searching for direct SWISS flights from IAD to KGS. You’ll also be able to compare other carriers offering the same nonstop journey.

To find the earliest departures from IAD to KGS with SWISS, filter your search by “Morning” and “Early Morning.” Booking an early flight usually means you’re less likely to experience cancellations.**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.

Kos Island Intl. Airport (KGS) is the primary Kos gateway for SWISS flights from Washington Dulles Intl. Airport (IAD).

For checked luggage, you can bring 1 checked-in bag weighing up to 50 lb with dimensions not exceeding 62 inches. You can also travel with 1 cabin bag on board when flying standard economy from IAD to KGS with SWISS. This carry-on has to weigh less than 17 lb and be no bigger than 22 inches x 21 inches x 5 inches. Exceeding these limits can mean additional fees, so check SWISS’s baggage allowance guidelines before packing.

With a 4-star airline rating and a rewarding loyalty program, SWISS is a popular option for many passengers flying from IAD to KGS. Also, if you’re a Swiss Miles & More and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be spent on future getaways.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are usually free within 24 hours of making a booking, but your airline may charge you after that. For further information about altering your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to adjust your plans without additional charges, tick the “Changes included” and “No cancel fee” filters when organizing your next adventure.