BOS - KGS

$925 Find Cheap Flights from Boston to Kos

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Kos departing on 5/16. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

Search hundreds of travel sites at once for deals on flights to Kos

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Kos, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Kos, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheap Flight Deals from Boston to Kos (BOS-KGS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Kos that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Boston to Kos

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Boston to Kos.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
8:05 pm - 7:25 pmBOS-KGS
16h 20m1 stop
9:35 am - 3:40 pmKGS-BOS
13h 05m1 stop
$925Lufthansa
Find Deal
Fri, May 16 - Sat, May 24
8:05 pm - 7:25 pmBOS-KGS
16h 20m1 stop
9:35 am - 7:20 pmKGS-BOS
16h 45m2 stops
$935Lufthansa
Find Deal
Fri, May 16 - Sat, May 24
5:50 pm - 4:20 pmBOS-KGS
15h 30m2 stops
9:35 am - 3:40 pmKGS-BOS
13h 05m1 stop
Thu, May 15 - Sat, May 24
5:50 pm - 4:20 pmBOS-KGS
15h 30m2 stops
9:35 am - 7:20 pmKGS-BOS
16h 45m2 stops
Thu, May 15 - Sat, May 24
5:10 pm - 8:50 pmBOS-KGS
20h 40m1 stop
9:35 am - 3:40 pmKGS-BOS
13h 05m1 stop
$1,002
Find Deal
Thu, May 15 - Sat, May 24
8:27 pm - 8:05 pmBOS-KGS
40h 38m3 stops
2:05 pm - 10:49 pmKGS-BOS
39h 44m2 stops
$2,763
Find Deal
Fri, May 16 - Sat, May 24
8:27 pm - 8:05 pmBOS-KGS
64h 38m3 stops
2:05 pm - 10:49 pmKGS-BOS
39h 44m2 stops
$3,165
Find Deal
Thu, May 15 - Sat, May 24
6:45 pm - 5:30 pmBOS-KGS
39h 45m3 stops
11:25 am - 6:09 pmKGS-BOS
37h 44m3 stops
$3,733Emirates
Find Deal
Fri, May 16 - Sat, May 24
4:35 pm - 5:30 pmBOS-KGS
65h 55m3 stops
11:25 am - 6:09 pmKGS-BOS
37h 44m3 stops
$3,812Emirates
Find Deal
Thu, May 15 - Sat, May 24

Flights from Boston to Kos - Travel Insights & Trends

Get data-powered insights and trends into flights from Boston to Kos to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Boston to Kos?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the past 3 days, the cheapest round-trip tickets from Boston to Kos were found on Lufthansa ($925) and Emirates ($3,733).

Good to know

Cheapest flight

$925
Flight from Boston to Kos

When to book flights from Boston to Kos

Are your dates flexible? Find out the best times to travel from Boston to Kos based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boston to Kos

  • What is the cheapest flight from Boston to Kos?

    In the last 3 days, the lowest price for a flight from Boston to Kos was $925 for a round-trip ticket.

  • Do I need a passport to fly between Boston and Kos?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Boston and on arrival in Kos.

  • Which aircraft models fly most regularly from Boston to Kos?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to Kos?

    Star Alliance is the only airline alliance operating flights between Boston and Kos.

  • How does KAYAK find such low prices on flights from Boston to Kos?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Kos.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Kos?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Kos from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Kos?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Kos with an airline and back to Boston with another airline. Booking your flights between Boston and KGS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Kos?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Kos from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from Boston to Kos

 
See real verified KAYAK customer reviews for airlines flying from Boston to Kos. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Kos? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
SWISSOverall score based on 1568 reviews
7.0Food
7.6Boarding
7.3Comfort
8.2Crew
6.7Entertainment
Airline reviews

I slept the whole flight so I can't tell you about the food and there was no entertainment offered. Crew was very nice, seats were comfortable in business, and boarding was easy.

8.0 ExcellentJanie, Feb 2025ORD - PHX
Read more SWISS reviews

I slept the whole flight so I can't tell you about the food and there was no entertainment offered. Crew was very nice, seats were comfortable in business, and boarding was easy.

I haven't flown Swiss in a long time. I was disappointed that after paying $14,907 for 3 business class seats, we still had to pay another $200 for a single business class seat. All the window seats used to be single seats. Now it's every other one and if you want a single seat it's extra. Also, The double seats do not have pods or any privacy. We landed in Chicago after a long 10 hour flight and our connecting flight was on United. Because we do not have status on Swiss, we were not allowed to use the United lounge, even with business class seats. My father is on crutches and we had a 4 hour layover. No lounge was also disappointing. All of my status is on British Airways so I will go back to flying BA. We flew Swiss because my father did not want to go through Heathrow. On a positive, the crew were super nice and accommodating for my father who had recently had hip replacement surgery. Food was okay. I"m not a good person to critique the food, I never like airplane food.

We are flying with Swiss for a long time but this time was terrible do to are flight cancellations we are in some bad hotel with out normal food

It is a good airlines, very professional very good food. I wish they offered free luggage is the only thing.

I like how professional, fast and good the whole experience was.

Nothing special.. they could have provided something to eat without a charge

Everything was great except food . It as okay not good not bad

Seats are too cramped, but that is a problem with every airline. I actually enjoyed the meal served.

Edelweiss is now Nickle&dimming, not even a complimentary wine on the intercontinental flight. Sitting space is the smallest I have ever seen.

I have no complaints. The crew was attentive, pleasant and heloful

Crew was not happy. Very uncomfortable seats. When person leans back in front of you the screen is too close to me. Food was awful.

They lost my luggage and despite all follow ups through emails and phone calls they don’t give me an update

Everything went really well. Snacks could be better and there was no tea/coffee service after dinner. Crew was helpful and friendly.

Both flights were delayed and we missed our connection. Our second flight was delayed 3 times. I have always had great service and never any problems with my flights on Lufthansa. My last two flights were, unfortunately, awful. I fly quite often to Germany and have had better luck with United than Lufthansa.

Lufthansa charged me $280 to take skiiis when in the US the boot bag and skiis are one check-in bag. This was not advertised and a real shock at the airport. They only took the boot bag as a check-in item. The seats have been squeezed together like any economy airline and legroom is not as good as it used to be. Otherwise, the flight was fine and staff was helpful for making my connection.

On board Entertainment and crew services were absolutely trash! Neither me, nor any of my 40 family/friends members are flying Lufthansa again!

Eet late informed about delay of more rhan four houts

After living in Europe for five years and flying with Lufthansa and KLM airlines, I’ve realized that United Airlines is now a budget carrier. The flight attendant are not friendly. The seats are not comfortable. And everything comes at a cost. I will be flying with KLM and Skyteam like Delta to the US going forward no doubt. United Airlines is not what it once was:

Delayed over 2 hours. Bring your own snacks or prepare to pay. No entertainment and no plug plugs for charging.

My schedule flight was rebooking and changed to Chicago, then I did not used the flight from Dulles to Savannah

Traveling to a place near Kos?

Book flights to Kos if you plan to visit one of these locations
Marmari

Everything you need to know for your flight from Boston to Kos

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.