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

Cheapflights users have booked flights from Boston to Kos round-trip from $954. Another airline that can offer you cheap pricing is Lufthansa.

What is the cheapest day to fly from Boston to Kos?

Travelers seeking maximum savings on their Boston to Kos flight should consider departing on Saturday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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.

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).

What is the cheapest day to fly round-trip from Boston to Kos?

Users have found that leaving on a Friday can be a cost-effective option. It’s possible to save up to 35% on your flight compared to booking on days when demand is much higher.

What is the cheapest time of day to fly from BOS to KGS?

When flying from Boston to Kos, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 2% versus a flight in the morning.

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.

$594+ Flights from Boston to Kos

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Cheap flight deals from Boston to Kos

Round-trip from	$594 (Trip.com)

From Boston Logan Intl to Kos

Search Deals

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 septiembre 11, 2025.

dom. 10/2610:50 pmBOS - KGS

2 stops16h 25mMultiple Airlines

dom. 11/29:45 pmKGS - BOS

2 stops53h 35mMultiple Airlines

Deal found 9/10

$594

Best flights from Boston to Kos
Discover carefully curated flight deals from Boston to Kos that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated septiembre 11, 2025.

dom. 10/2610:50 pmBOS - KGS

2 stops16h 25mMultiple Airlines

dom. 11/29:45 pmKGS - BOS

2 stops53h 35mMultiple Airlines

Deal found 9/10

$594

Last-minute flights from Boston to Kos
Discover last-minute flight deals from Boston to Kos. Data last updated septiembre 11, 2025 and is based on user searches.

dom. 10/2610:50 pmBOS - KGS

2 stops16h 25mMultiple Airlines

dom. 11/29:45 pmKGS - BOS

2 stops53h 35mMultiple Airlines

Deal found 9/10

$594

One-way flights from Boston to Kos
Search for one-way flight options from Boston to Kos. Find affordable one-way fares based on user searches. Data last updated septiembre 11, 2025.

vie. 12/2610:10 pmBOS - KGS

2 stops35h 55mEmirates

Deal found 9/10

$3,224

Fly from

Fly to

Route

Depart

Return

Price

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

dom. 10/26

10:50 pm-9:15 pm

2 stops16h 25m

Kos

dom. 11/2

9:45 pm-8:20 pm

2 stops53h 35m

$594

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

vie. 12/26

10:10 pm-5:05 pm

2 stops35h 55m

$3,224

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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.

Reviews of airlines servicing Kos

Read reviews from past customers who have flown SWISS and Lufthansa from Boston to Kos. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

SWISS

7.5

Good

1,731 reviews

Reviews

1 / 20

6.0

Good

Yvette,Nov 2024

ZRH - ATH

The website is difficult to navigate. You pay for everything. The carry on baggage policy is complicated. The food choices were poor and the seat was uncomfortable.

SWISS

7.5

Good

1,731 reviews

SWISS

7.5

Good

1,731 reviews

Reviews

1 / 20

6.0

Good

Yvette,Nov 2024

ZRH - ATH

The website is difficult to navigate. You pay for everything. The carry on baggage policy is complicated. The food choices were poor and the seat was uncomfortable.

Lufthansa

6.8

Okay

7,409 reviews

SWISS

7.5

Good

1,731 reviews

Reviews

1 / 20

6.0

Good

Yvette,Nov 2024

ZRH - ATH

The website is difficult to navigate. You pay for everything. The carry on baggage policy is complicated. The food choices were poor and the seat was uncomfortable.

Related info for your journey

What are the cheapest airlines flying from Boston to Kos round-trip?
Cheapflights users have booked flights from Boston to Kos round-trip from $954. Another airline that can offer you cheap pricing is Lufthansa.
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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Boston to Kos

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Hartford to Mykonos flights

Albany to Santorini flights

Top 2 airlines flying from Boston to Kos

Airline	Cheapest	Average	Flexibility	On-time
SWISS	Cheapest$954	Average$1,151	FlexibilityNo cancel fee	On-time79%
Lufthansa	Cheapest$981	Average$1,081	FlexibilityNo cancel fee	On-time76%

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$594+ Cheap flights from Boston (BOS) to Kos (KGS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boston to Kos with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Boston to Kos

Round-trip from

Find flight deals from Boston to Kos

Cheapest flights from Boston to KosExplore 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 septiembre 11, 2025.

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 septiembre 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Kos that are best for you.

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.

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 septiembre 11, 2025.

Read reviews from past customers who have flown SWISS and Lufthansa from Boston to Kos. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

How can I find direct flights from Boston to Kos?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boston to Kos

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Boston to Kos

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Travel Smart

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 septiembre 11, 2025.