$688 Cheap Swiss International Air Lines flights Boston (BOS) to Kos (KGS)

You’ll find budget-friendly return SWISS flights from $818 from BOS to KGS by filtering your results from “Price (lowest to highest)” on Expedia. Or search for deals from $688 for a one-way trip.**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.

December is one of the most affordable months to travel to Kos with SWISS. You could also find great prices on return and one-way tickets in February.

Snagging the best SWISS deals from BOS to KGS often comes down to booking at the right time. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better still, 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 you want to travel.*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.

Click on the “Nonstop” filter when looking for direct SWISS flights from BOS to KGS. It’s also an easy way to compare other carriers offering the same nonstop trip.

Search SWISS’s earliest flights from BOS to KGS by selecting our “Morning” and “Early Morning” filters. Not only will you get to where you’re going sooner, early departures also experience 20% fewer 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.

Board a SWISS flight from Logan Intl. Airport (BOS) to Kos, and you’re most likely to arrive at Kos Island Intl. Airport (KGS). This is the airline’s main hub in this city.

On a standard economy flight with SWISS from BOS to KGS, you can bring 1 checked-in bag up to 50 lb with dimensions not exceeding 62 inches in total. For hand luggage, you’re permitted 1 cabin bag weighing up to 17 lb and measuring no more than 22 inches x 21 inches x 5 inches. Weight and size limits can differ based on your airfare type and cabin class. To make sure you won’t face extra charges at the airport, check your SWISS booking or visit the airline’s website before you start packing.

SWISS makes flying from BOS to KGS more enjoyable with a 4-star airline rating and a rewarding loyalty program. You could even start collecting points with Swiss Miles & More. Make sure you sign up to our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

In most cases, you can cancel or modify your flight, although additional fees may apply if you made your booking over 24 hours ago. Need flexible options? Apply the “Changes included” or “No cancel fee” filter to find flights that won’t charge extra if you have to adjust your plans. To update your booking, go to “Trips,” select your flight and click on “Manage Booking” for more details.