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Cheap flights from Massachusetts to Kos from $325

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Massachusetts to Kos departing on 9/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Massachusetts to Kos

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:05 pm - 5:15 pmBOS  Boston Logan Intl-KGS Kos
14h 10m2 stops Munich Franz Josef Strauss Bari Palese
Multiple Airlines Logo
11:55 pm - 5:40 pmKGS  Kos-BOS Boston Logan Intl
24h 45m2 stops Bari Palese Munich Franz Josef Strauss
$875Multiple Airlines
Tue, Sep 1 - Mon, Sep 14
Multiple Airlines Logo
8:50 pm - 10:05 pmBOS  Boston Logan Intl-KGS Kos
18h 15m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
12:10 am - 1:40 pmKGS  Kos-BOS Boston Logan Intl
44h 30m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Island
$909Multiple Airlines
Mon, Sep 21 - Sun, Sep 27
Multiple Airlines Logo
5:45 pm - 5:15 pmBOS  Boston Logan Intl-KGS Kos
16h 30m3 stops Frankfurt am Main Munich Franz Josef Strauss Bari Palese
Multiple Airlines Logo
11:55 pm - 5:40 pmKGS  Kos-BOS Boston Logan Intl
24h 45m2 stops Bari Palese Munich Franz Josef Strauss
$926Multiple Airlines
Tue, Sep 1 - Mon, Sep 14
Multiple Airlines Logo
8:50 pm - 10:05 pmBOS  Boston Logan Intl-KGS Kos
18h 15m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
12:10 am - 9:26 pmKGS  Kos-BOS Boston Logan Intl
28h 16m2 stops London Gatwick Montreal Pierre Elliott Trudeau Intl
$968Multiple Airlines
Mon, Sep 21 - Sun, Sep 27
Multiple Airlines Logo
5:40 pm - 10:10 pmBOS  Boston Logan Intl-KGS Kos
21h 30m3 stops Kastrup Copenhagen Brussels Bruxelles-National Athens Eleftherios V.
Multiple Airlines Logo
12:20 pm - 3:35 pmKGS  Kos-BOS Boston Logan Intl
34h 15m3 stops Brussels Bruxelles-National Stockholm Arlanda Kastrup Copenhagen
$968Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
9:40 pm - 7:40 pmBOS  Boston Logan Intl-KGS Kos
15h 00m1 stop Zurich
Multiple Airlines Logo
11:00 pm - 4:10 pmKGS  Kos-BOS Boston Logan Intl
24h 10m2 stops Milan Malpensa Madrid Barajas
$988Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
3:35 pm - 12:35 amBOS  Boston Logan Intl-KGS Kos
26h 00m3 stops Montreal Pierre Elliott Trudeau Intl London Heathrow Athens Eleftherios V.
Multiple Airlines Logo
12:10 am - 10:40 pmKGS  Kos-BOS Boston Logan Intl
29h 30m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
$990Multiple Airlines
Tue, Sep 1 - Sun, Sep 13
SWISS Logo
9:40 pm - 7:40 pmBOS  Boston Logan Intl-KGS Kos
15h 00m1 stop Zurich
SWISS Logo
11:00 am - 7:55 pmKGS  Kos-BOS Boston Logan Intl
15h 55m1 stop Zurich
$1,006SWISS
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
3:35 pm - 12:35 amBOS  Boston Logan Intl-KGS Kos
26h 00m3 stops Montreal Pierre Elliott Trudeau Intl London Heathrow Athens Eleftherios V.
Multiple Airlines Logo
12:10 am - 4:05 pmKGS  Kos-BOS Boston Logan Intl
46h 55m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
$1,017Multiple Airlines
Tue, Sep 1 - Sun, Sep 6
SWISS Logo
9:40 pm - 7:40 pmBOS  Boston Logan Intl-KGS Kos
15h 00m1 stop Zurich
SWISS Logo
8:30 pm - 3:10 pmKGS  Kos-BOS Boston Logan Intl
25h 40m1 stop Zurich
$1,590SWISS
Mon, Aug 24 - Tue, Sep 8

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SWISS flights from Massachusetts to Kos

Our best SWISS deals on Massachusetts to Kos flight tickets
SWISS
Sep 21
BOS9:40 pmBoston Logan Intl
15h 00m
1 stop
KGS7:40 pmKos
Sep 28
KGS11:00 amKos
15h 55m
1 stop
BOS7:55 pmBoston Logan Intl
$1,006
SWISS
Aug 24
BOS9:40 pmBoston Logan Intl
15h 00m
1 stop
KGS7:40 pmKos
Sep 8
KGS8:30 pmKos
25h 40m
1 stop
BOS3:10 pmBoston Logan Intl
$1,590
SWISS
Aug 25
BOS5:10 pmBoston Logan Intl
19h 45m
1 stop
KGS7:55 pmKos
Sep 8
KGS8:30 pmKos
30h 25m
1 stop
BOS7:55 pmBoston Logan Intl
$1,592

Lufthansa flights from Massachusetts to Kos

Our best Lufthansa deals on Massachusetts to Kos flight tickets
Lufthansa
Aug 25
BOS7:23 pmBoston Logan Intl
16h 42m
2 stops
KGS7:05 pmKos
Sep 9
KGS1:30 pmKos
13h 40m
1 stop
BOS8:10 pmBoston Logan Intl
$1,606
Lufthansa
Aug 24
BOS2:28 pmBoston Logan Intl
39h 12m
2 stops
KGS12:40 pmKos
Sep 9
KGS1:30 pmKos
13h 40m
1 stop
BOS8:10 pmBoston Logan Intl
$1,651
Lufthansa
Aug 24
BOS7:23 pmBoston Logan Intl
34h 17m
2 stops
KGS12:40 pmKos
Sep 9
KGS7:55 pmKos
35h 04m
2 stops
BOS11:59 pmBoston Logan Intl
$1,658

momondo Fare Finder

 
Customize your flight search to find flights from Massachusetts 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, momondo users made 832,500 searches. Data last updated August 9, 2026.
Use the filters below to find and compare flights from Massachusetts to Kos that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Tue 9/1

8:05 pm-5:15 pm

2 stops14h 10m

Kos

Mon 9/14

11:55 pm-5:40 pm

2 stops24h 45m

$875

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 9/21

8:50 pm-10:05 pm

2 stops18h 15m

Kos

Sun 9/27

12:10 am-1:40 pm

3 stops44h 30m

$909

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Tue 9/1

5:45 pm-5:15 pm

3 stops16h 30m

Kos

Mon 9/14

11:55 pm-5:40 pm

2 stops24h 45m

$926

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 9/21

8:50 pm-10:05 pm

2 stops18h 15m

Kos

Sun 9/27

12:10 am-9:26 pm

2 stops28h 16m

$968

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 9/21

5:40 pm-10:10 pm

3 stops21h 30m

Kos

Mon 9/28

12:20 pm-3:35 pm

3 stops34h 15m

$968

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 9/21

9:40 pm-7:40 pm

1 stop15h 00m

Kos

Mon 9/28

11:00 pm-4:10 pm

2 stops24h 10m

$988

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Tue 9/1

3:35 pm-12:35 am

3 stops26h 00m

Kos

Sun 9/13

12:10 am-10:40 pm

3 stops29h 30m

$990
Quickest round-trip

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 9/21

9:40 pm-7:40 pm

1 stop15h 00m

Kos

Mon 9/28

11:00 am-7:55 pm

1 stop15h 55m

$1,006

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Tue 9/1

3:35 pm-12:35 am

3 stops26h 00m

Kos

Sun 9/6

12:10 am-4:05 pm

3 stops46h 55m

$1,017

BostonKos

BOS Boston Logan Intl - KGS Kos

BOSKGS

Boston Logan Intl

Mon 8/24

9:40 pm-7:40 pm

1 stop15h 00m

Kos

Tue 9/8

8:30 pm-3:10 pm

1 stop25h 40m

$1,590

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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Cheap Massachusetts to Kos flight deals and tips

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

Fastest flight time

19h 20m

Direct flights

None
The fastest flight from Massachusetts to Kos takes 19h 20m
There are no direct flights from Massachusetts to Kos. There are no popular flight routes from Massachusetts to Kos.
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Frequently asked questions about flying from Massachusetts to Kos

  • When did momondo last update prices for flights from Massachusetts to Kos Airport?

    Prices for flights from Massachusetts to Kos Airport refresh daily.

  • How many operators does momondo search for flights from Massachusetts to Kos Airport?

  • How old do you have to be to fly from Massachusetts to Kos Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Massachusetts to Kos Airport.

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

    The travel and health documents required for your trip to Kos Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Kos Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Massachusetts to Kos

Compare and see reviews for airlines that fly from Massachusetts to Kos with momondo
Airline
Rating
Free Cancellation
Price
SWISSPriceFrom $967Free CancellationRating
7.5
2,031 reviews
Search SWISS flights

Frequently asked questions about flying from Massachusetts to Kos

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

    Price Alerts will notify you by email when the price for flights to Kos from Massachusetts 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 Massachusetts to Kos with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near Kos?

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

Why use momondo?

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

It is quick and easy to find Massachusetts to Kos flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Kos that suits you.

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

Yes. All flights to Kos from Massachusetts on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to Kos from Massachusetts. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from Massachusetts 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.

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Tue 9/8
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