BOS - KGS

$823 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 5/15. 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

KAYAK searches 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
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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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Boston to Kos.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
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4:15 pm - 10:55 amBOS-KGS
35h 40m3 stops
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11:25 am - 1:55 pmKGS-BOS
33h 30m3 stops
Thu, May 15 - Thu, May 22
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5:10 pm - 8:50 pmBOS-KGS
20h 40m1 stop
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11:05 am - 7:55 pmKGS-BOS
15h 50m1 stop
Thu, May 15 - Thu, May 22
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11:07 am - 8:50 pmBOS-KGS
26h 43m2 stops
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11:05 am - 7:55 pmKGS-BOS
15h 50m1 stop
Thu, May 15 - Thu, May 22
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11:07 am - 8:50 pmBOS-KGS
26h 43m2 stops
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7:30 pm - 5:40 pmKGS-BOS
29h 10m2 stops
Thu, May 15 - Thu, May 22
SWISS Logo
5:05 pm - 7:55 pmBOS-KGS
19h 50m1 stop
SWISS Logo
8:40 pm - 3:25 pmKGS-BOS
25h 45m1 stop
$1,044SWISS
Find Deal
Tue, Jul 29 - Wed, Aug 6
Lufthansa Logo
10:00 pm - 6:40 pmBOS-KGS
13h 40m1 stop
Lufthansa Logo
1:30 pm - 8:10 pmKGS-BOS
13h 40m1 stop
$1,053Lufthansa
Find Deal
Wed, Jul 30 - Wed, Aug 6
Lufthansa Logo
8:05 pm - 6:40 pmBOS-KGS
15h 35m2 stops
Lufthansa Logo
1:30 pm - 8:10 pmKGS-BOS
13h 40m1 stop
$1,080Lufthansa
Find Deal
Wed, Jul 30 - Wed, Aug 6
SWISS Logo
5:05 pm - 3:10 pmBOS-KGS
15h 05m1 stop
SWISS Logo
8:40 pm - 3:25 pmKGS-BOS
25h 45m1 stop
$1,104SWISS
Find Deal
Thu, Jul 31 - Wed, Aug 6
Emirates Logo
10:20 am - 5:30 pmBOS-KGS
48h 10m3 stops
Emirates Logo
11:25 am - 2:10 pmKGS-BOS
33h 45m2 stops
$1,940Emirates
Find Deal
Tue, Jul 29 - Wed, Aug 6
Emirates Logo
10:20 am - 5:30 pmBOS-KGS
72h 10m3 stops
Emirates Logo
11:25 am - 2:10 pmKGS-BOS
33h 45m2 stops
$2,169Emirates
Find Deal
Thu, Jul 31 - Wed, Aug 6

KAYAK's insights & trends for Boston to Kos flights

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 SWISS ($1,044) and Lufthansa ($1,053).

Good to know

Cheapest flight

$823
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 $823 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.

  • Which is the best airline for flights from Boston to Kos, SWISS or Lufthansa?

    The two airlines most popular with KAYAK users for flights from Boston to Kos are SWISS and Lufthansa. With an average price for the route of $1,213 and an overall rating of 7.5, SWISS is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $1,159 and an overall rating of 6.7.

  • 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 1572 reviews
8.2Crew
7.0Food
7.6Boarding
6.7Entertainment
7.4Comfort
Airline reviews

The biggest let down was with booking experience through Kayak. I booked a flight with checked bags on Kayak. Right away I got a message from travel agency that the flight is not confirmed and to call them. I called them and they said the flight I have booked is no longer available with the price I have booked it for and I can book it with about $100 more. I already had other options I could book with cheaper price so I asked them to cancel my booking. Then they said I can have the ticket with the same price but a date change which was not working for me as I had to be there for a seminar. So again I said no then they said they will cover the charges and confirm my flight. When comes time for check-in I see I have no checked bag option which means the travel agency deceived me saying I can have my booking as I had booked it. And at that point I ended up paying $155 for my checked bag going back and forth. I am extremely angry and unhappy with this experience

6.0 GoodMaryam, Mar 2025SFO - ZRH
Read more SWISS reviews

The biggest let down was with booking experience through Kayak. I booked a flight with checked bags on Kayak. Right away I got a message from travel agency that the flight is not confirmed and to call them. I called them and they said the flight I have booked is no longer available with the price I have booked it for and I can book it with about $100 more. I already had other options I could book with cheaper price so I asked them to cancel my booking. Then they said I can have the ticket with the same price but a date change which was not working for me as I had to be there for a seminar. So again I said no then they said they will cover the charges and confirm my flight. When comes time for check-in I see I have no checked bag option which means the travel agency deceived me saying I can have my booking as I had booked it. And at that point I ended up paying $155 for my checked bag going back and forth. I am extremely angry and unhappy with this experience

PLEASE DONT TAKE FORCEFULLY(SIZE APPROPRIATE) CARRY ONS FROM PASSENGERS WHO FOR SOME REASON NEED TO KEEP IT

It was great. My seat was comfortable. The bathrooms were clean . The service was superb . I travel a lot and I have been in 64 counties. I wish I could fly first class, even though I could , but I prefer to budget my yearly travelling expense on actual visiting , not on flight. Anyway, my point is that your economy was far much better than other airlines as good as Air France. The flight attendants and all crew were polite and very helpful and respectful. Thank you for making my long trip tolerable.

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

Good service … bus transfer upon arrival from plane to terminal: atrocious!!!

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

We had a 1 1/2 hour delay before we left Denver. When we arrive to Frankfort, they didn’t announce that people with connecting flights to exit the plane first. My next flight was already boarding when we we taxiing in to the gate. I waited another 10 minutes to get off the plane. I had to run to catch my next flight. I mean run! I made it with one minute to spare, but my luggage did not. My luggage came two hours later on a different flight.

My flight was late from US to Frankfurt so I missed my connecting flight flight and I had to wait for long to catch the next flight which was very tiring. Otherwise everyone was very nice.

It would have been nice if my luggage had made it onto my connecting flight as well. Now I have to wait for my luggage to be delivered and that might take a while, which certainly put a damper on the entire experience.

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.

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

Information on your arrival and departure airports

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