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Kos

$451+ Cheap flights from Boston (BOS) to Kos (KGS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — KGS
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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Cheap flight deals from Boston to Kos

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Kos (KGS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,048
(SWISS)

One-way from

$460
(Kiwi.com)
Provider with most accurate pricing for Boston Logan Intl-Kos flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-Kos flights.
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From Boston Logan Intl to Kos
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One-way flight from Boston Logan Intl to Kos
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Find flight deals from Boston to Kos

Cheapest flights from Boston to Kos
Explore the most affordable flight options available from Boston to Kos. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

This SWISS deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/145:05 pmBOS - KGS
1 stop19h 35mSWISS
Thu 7/2411:00 amKGS - BOS
1 stop35h 25mSWISS
Deal found 4/29$1,048
This Mytrip deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1810:40 amBOS - KGS
3 stops25h 00mMultiple Airlines
Mon 6/3011:25 amKGS - BOS
3 stops34h 10mMultiple Airlines
Deal found 4/29$1,061

Cheapflights Fare Finder

Customize your flight search to find flights from Boston to Kos that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
Use the filters below to find and compare flights from Boston to Kos that are best for you.

Fly from

Boston

Fly to

Kos

Route

Depart

Return

Price

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Mon 7/14

5:05 pm-7:40 pm

1 stop19h 35m

Kos

Thu 7/24

11:00 am-3:25 pm

1 stop35h 25m

$1,048

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Wed 6/18

10:40 am-6:40 pm

3 stops25h 00m

Kos

Mon 6/30

11:25 am-2:35 pm

3 stops34h 10m

$1,061

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 5/20

7:15 pm-5:30 pm

3 stops39h 15m

$451

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 5/20

8:05 pm-7:05 pm

1 stop16h 00m

$710

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Compare providers for flights from Boston to Kos

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Kos in April.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Kos flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Kos flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Kos flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Kos flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Kos flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Kos

Have a flexible travel schedule? Discover the best time to fly to Kos from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

Rainfall in Kos by month

Plan your trip to Kos by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Kos ranges from 0.1 - 6.7 inches per month. January is typically the wettest month, when rainfall can reach 6.7 in. July is typically the driest time to visit Kos when rainfall is around 0.1 in.

Temperature in Kos by month

Plan your trip to Kos by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Kos, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 50.0 F).

Reviews of airlines servicing Kos

Get insights into the airlines that provide service to Kos. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Kos. Reviews last updated April 29, 2025.
Austrian Airlines
7.6
Good
780 reviews

Crew

8.1

Entertainment

6.7

Boarding

7.6

Comfort

7.3

Food

6.7

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Austrian Airlines
7.6
Good
780 reviews
Austrian Airlines
7.6
Good
780 reviews

Crew

8.1

Entertainment

6.7

Boarding

7.6

Comfort

7.3

Food

6.7

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
SWISS
7.5
Good
1,588 reviews
Austrian Airlines
7.6
Good
780 reviews

Crew

8.1

Entertainment

6.7

Boarding

7.6

Comfort

7.3

Food

6.7

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Lufthansa
6.7
Okay
7,042 reviews
Austrian Airlines
7.6
Good
780 reviews

Crew

8.1

Entertainment

6.7

Boarding

7.6

Comfort

7.3

Food

6.7

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
British Airways
6.6
Okay
6,837 reviews
Austrian Airlines
7.6
Good
780 reviews

Crew

8.1

Entertainment

6.7

Boarding

7.6

Comfort

7.3

Food

6.7

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.

Related info for your journey

Find useful and relevant information for your journey from Boston to Kos. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Boston to Kos round-trip?

    Cheapflights users have booked flights from Boston to Kos round-trip from $1,048. Another airline that can offer you cheap pricing is Austrian Airlines.

  • What are the cheapest airlines to fly from Boston to Kos one-way?

    The cheapest airlines for a one-way flight from Boston to Kos are Lufthansa ($1,140), British Airways ($1,611), and SWISS ($1,638).

  • Can I find deals for flights from Boston to Kos that include hotel bookings?

    Yes. In addition to deals on Boston to Kos flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Kos?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Kos.

  • Can I find deals for business class flights from Boston to Kos?

    Yes. Cheapflights offers flight deals from Boston to Kos by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Top 2 airlines flying from Boston to Kos

Discover the top 2 airlines that operate flights from Boston to Kos. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$928Average$1,094FlexibilityNo cancel feeOn-time79%
LufthansaCheapest$981Average$1,159FlexibilityNo cancel feeOn-time76%

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