How do I get Price Alerts for flights from Boston to Kos?

Price Alerts will notify you by email when the price for flights to Kos from Boston decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

How can I save money on flights from Boston to Kos with momondo?

Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

How does momondo find its flight prices?

momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

When did momondo last update prices for flights from Boston Logan Intl Airport to Kos Airport?

Prices for flights from Boston Logan Intl Airport to Kos Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Boston Logan Intl Airport to Kos Airport?

As of September 2026, there is 1 operator available to choose from for flights from Boston Logan Intl Airport to Kos Airport.

How old do you have to be to fly from Boston Logan Intl Airport to Kos Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Boston Logan Intl Airport to Kos Airport.

What documentation or ID do you need to fly to Kos Airport?

The necessary travel and health documents for your Kos Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$970 Cheap Flights from Boston to Kos in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Kos

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:50 pm - 7:45 amBOS Boston Logan Intl-KGS Kos

28h 55m3 stops Reykjavik Keflavik Intl Paris Charles de Gaulle Athens Eleftherios V.

8:40 pm - 5:50 pmKGS Kos-BOS Boston Logan Intl

28h 10m3 stops Athens Eleftherios V. Paris Charles de Gaulle Reykjavik Keflavik Intl

$970Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

8:40 pm - 8:05 pmBOS Boston Logan Intl-KGS Kos

16h 25m2 stops Munich Franz Josef Strauss Athens Eleftherios V.

8:35 pm - 8:20 pmKGS Kos-BOS Boston Logan Intl

30h 45m2 stops Athens Eleftherios V. Zurich

$1,020Multiple Airlines

Mon, Feb 22 - Mon, Mar 1

6:55 pm - 4:45 pmBOS Boston Logan Intl-KGS Kos

14h 50m2 stops Vienna Intl Athens Eleftherios V.

8:35 pm - 8:20 pmKGS Kos-BOS Boston Logan Intl

30h 45m2 stops Athens Eleftherios V. Zurich

$1,024Multiple Airlines

Sun, Feb 21 - Mon, Mar 1

7:50 pm - 7:45 amBOS Boston Logan Intl-KGS Kos

28h 55m3 stops Reykjavik Keflavik Intl Paris Charles de Gaulle Athens Eleftherios V.

2:05 pm - 2:30 pmKGS Kos-BOS Boston Logan Intl

31h 25m3 stops Athens Eleftherios V. Barcelona-El Prat Lisbon Humberto Delgado

$1,038Multiple Airlines

Wed, Nov 4 - Wed, Nov 11

10:25 am - 4:45 pmBOS Boston Logan Intl-KGS Kos

24h 20m2 stops Montreal Pierre Elliott Trudeau Intl Athens Eleftherios V.

2:05 pm - 2:30 pmKGS Kos-BOS Boston Logan Intl

30h 25m2 stops Athens Eleftherios V. Vienna Intl

$1,079Multiple Airlines

Sun, Mar 14 - Mon, Mar 22

8:40 pm - 8:05 pmBOS Boston Logan Intl-KGS Kos

16h 25m2 stops Munich Franz Josef Strauss Athens Eleftherios V.

8:35 pm - 1:45 pmKGS Kos-BOS Boston Logan Intl

24h 10m2 stops Athens Eleftherios V. Frankfurt am Main

$1,085Multiple Airlines

Mon, Feb 22 - Sun, Feb 28

6:55 pm - 4:45 pmBOS Boston Logan Intl-KGS Kos

14h 50m2 stops Vienna Intl Athens Eleftherios V.

8:35 pm - 1:45 pmKGS Kos-BOS Boston Logan Intl

24h 10m2 stops Athens Eleftherios V. Frankfurt am Main

$1,088Multiple Airlines

Sun, Feb 21 - Sun, Feb 28

8:40 pm - 4:45 pmBOS Boston Logan Intl-KGS Kos

13h 05m2 stops Munich Franz Josef Strauss Athens Eleftherios V.

8:35 pm - 1:30 pmKGS Kos-BOS Boston Logan Intl

23h 55m2 stops Athens Eleftherios V. Vienna Intl

$1,098Multiple Airlines

Sat, Feb 20 - Mon, Mar 1

8:40 pm - 7:45 amBOS Boston Logan Intl-KGS Kos

28h 05m2 stops Munich Franz Josef Strauss Athens Eleftherios V.

8:35 pm - 7:35 pmKGS Kos-BOS Boston Logan Intl

29h 00m2 stops Athens Eleftherios V. Munich Franz Josef Strauss

$1,100Multiple Airlines

Sat, Mar 13 - Mon, Mar 22

9:50 pm - 1:30 pmBOS Boston Logan Intl-KGS Kos

32h 40m1 stop Zurich

2:05 pm - 5:50 pmKGS Kos-BOS Boston Logan Intl

34h 45m3 stops Athens Eleftherios V. London Heathrow Reykjavik Keflavik Intl

$1,126Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

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Emirates flights from Boston to Kos

Our best Emirates deals on Boston to Kos flight tickets

Emirates

Feb 23

BOS10:10 pmBoston Logan Intl

38h 55m

2 stops

KGS8:05 pmKos

Feb 26

KGS2:05 pmKos

30h 50m

2 stops

BOS1:55 pmBoston Logan Intl

$1,772

Emirates

Feb 18

BOS10:10 pmBoston Logan Intl

38h 55m

2 stops

KGS8:05 pmKos

Mar 1

KGS2:05 pmKos

30h 50m

2 stops

BOS1:55 pmBoston Logan Intl

$1,822

Emirates

Oct 18

BOS11:05 pmBoston Logan Intl

35h 30m

2 stops

KGS5:35 pmKos

Oct 21

KGS6:05 pmKos

51h 15m

2 stops

BOS2:20 pmBoston Logan Intl

$1,864

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 11/2

7:50 pm-7:45 am

3 stops28h 55m

Kos

Mon 11/9

8:40 pm-5:50 pm

3 stops28h 10m

$970

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 2/22

8:40 pm-8:05 pm

2 stops16h 25m

Kos

Mon 3/1

8:35 pm-8:20 pm

2 stops30h 45m

$1,020

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Sun 2/21

6:55 pm-4:45 pm

2 stops14h 50m

Kos

Mon 3/1

8:35 pm-8:20 pm

2 stops30h 45m

$1,024

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Wed 11/4

7:50 pm-7:45 am

3 stops28h 55m

Kos

Wed 11/11

2:05 pm-2:30 pm

3 stops31h 25m

$1,038

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Sun 3/14

10:25 am-4:45 pm

2 stops24h 20m

Kos

Mon 3/22

2:05 pm-2:30 pm

2 stops30h 25m

$1,079

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 2/22

8:40 pm-8:05 pm

2 stops16h 25m

Kos

Sun 2/28

8:35 pm-1:45 pm

2 stops24h 10m

$1,085

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Sun 2/21

6:55 pm-4:45 pm

2 stops14h 50m

Kos

Sun 2/28

8:35 pm-1:45 pm

2 stops24h 10m

$1,088

Quickest round-trip

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Sat 2/20

8:40 pm-4:45 pm

2 stops13h 05m

Kos

Mon 3/1

8:35 pm-1:30 pm

2 stops23h 55m

$1,098

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Sat 3/13

8:40 pm-7:45 am

2 stops28h 05m

Kos

Mon 3/22

8:35 pm-7:35 pm

2 stops29h 00m

$1,100

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 11/2

9:50 pm-1:30 pm

1 stop32h 40m

Kos

Mon 11/9

2:05 pm-5:50 pm

3 stops34h 45m

$1,126

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Boston to Kos

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Kos according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Boston to Kos (BOS to KGS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Kos

Best Price Found	$970
Fastest flight time	21h 00m
Direct flights	None

The best flight deal from Boston to Kos found on momondo in the last 72 hours is $970

The fastest flight from Boston to Kos takes 21h 00m

There are no direct flights from Boston to Kos. There are no popular flight routes from Boston to Kos.

Search flight deals

Frequently asked questions about flying from Boston to Kos

How far is Boston Logan Intl to Kos by plane?
The distance between Boston Logan Intl and Kos is about 4930.9 mi. By plane, this route typically takes 21h 00m.
When did momondo last update prices for flights from Boston Logan Intl Airport to Kos Airport?
Prices for flights from Boston Logan Intl Airport to Kos Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Boston Logan Intl Airport to Kos Airport?
As of September 2026, there is 1 operator available to choose from for flights from Boston Logan Intl Airport to Kos Airport.
How old do you have to be to fly from Boston Logan Intl Airport to Kos Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Boston Logan Intl Airport to Kos Airport.
What documentation or ID do you need to fly to Kos Airport?
The necessary travel and health documents for your Kos Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Boston to Kos?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Boston to Kos is SWISS (100% of total bookings).

Best airlines flying from Boston to Kos

Compare and see reviews for airlines that fly from Boston to Kos with momondo

Airline	Rating	Free Cancellation	Price
SWISS	PriceFrom $967	Free Cancellation	Rating 7.5 2,083 reviews		Search SWISS flights

Frequently asked questions about flying from Boston to Kos

How do I get Price Alerts for flights from Boston to Kos?
Price Alerts will notify you by email when the price for flights to Kos from Boston decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.
How can I save money on flights from Boston to Kos with momondo?
Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.
How does momondo find its flight prices?
momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Marmari

Kardamena

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Kos?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Kos from Boston.

Can I find flights from Boston to Kos with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Kos from Boston with this policy.

How can momondo help me find flights from Boston to Kos?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Boston to Kos.

I’m not ready to book a flight from Boston to Kos right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Boston to Kos now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Kos and let you know when they change.

An easier way to manage your Kos trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Rhodes Diagoras Airport

Naxos Island Airport

Cheap flights from Boston to Kos from $970

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Kos departing on 11/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Boston to Kos

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Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Emirates flights from Boston to Kos

Our best Emirates deals on Boston to Kos flight tickets

momondo Fare Finder

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

When to book flights from Boston to Kos

Cheap Boston to Kos (BOS to KGS) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Boston to Kos

Best airlines flying from Boston to Kos

Compare and see reviews for airlines that fly from Boston to Kos with momondo

Frequently asked questions about flying from Boston to Kos

Traveling to a place near Kos?

Why use momondo?

An easier way to manage your Kos trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Greece

Airports servicing South Aegean

Fly your favorite airline to Kos

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Kos

List of cabin classes available on flights landing in Kos. Availability may vary depending on flight origin and airline.

Popular cities in Greece

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Boston

According to popular flight searches on momondo this year

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According to popular flight searches on momondo this year