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Cheap flights from Massachusetts to Kos from $636

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 7/5. 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
0 bags

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Find the cheapest flights from Massachusetts to Kos

Cheap round-trip flights

Enter your travel dates to find the best prices.
SWISS Logo
9:40 pm - 10:10 am
BOS
-
KGS
29h 30m
1 stop
SWISS Logo
8:40 pm - 7:55 pm
KGS
-
BOS
30h 15m
1 stop
$1,003SWISS
Tue, Jul 7 - Wed, Aug 26
Austrian Airlines Logo
2:15 pm - 8:50 pm
BOS
-
KGS
23h 35m
2 stops
Austrian Airlines Logo
9:10 pm - 1:50 pm
KGS
-
BOS
23h 40m
1 stop
$1,017Austrian Airlines
Tue, Jul 7 - Thu, Aug 27
SWISS Logo
9:40 pm - 8:00 pm
BOS
-
KGS
15h 20m
1 stop
SWISS Logo
11:00 am - 3:10 pm
KGS
-
BOS
35h 10m
1 stop
$1,021SWISS
Fri, Jul 10 - Mon, Aug 24
SWISS Logo
9:40 pm - 10:10 am
BOS
-
KGS
29h 30m
1 stop
SWISS Logo
8:30 pm - 3:10 pm
KGS
-
BOS
25h 40m
1 stop
$1,025SWISS
Sat, Jul 11 - Tue, Aug 25
Lufthansa Logo
7:27 pm - 7:05 pm
BOS
-
KGS
16h 38m
2 stops
Lufthansa Logo
7:55 pm - 5:40 pm
KGS
-
BOS
28h 45m
1 stop
$1,026Lufthansa
Tue, Jul 7 - Wed, Aug 26
Multiple Airlines Logo
10:58 am - 8:35 pm
BOS
-
KGS
26h 37m
2 stops
Multiple Airlines Logo
11:00 am - 3:10 pm
KGS
-
BOS
35h 10m
1 stop
$1,031Multiple Airlines
Fri, Jul 10 - Mon, Aug 24
Multiple Airlines Logo
10:45 am - 10:05 pm
BOS
-
KGS
28h 20m
2 stops
Multiple Airlines Logo
6:00 am - 9:45 am
KGS
-
BOS
34h 45m
3 stops
$1,040Multiple Airlines
Mon, Jun 8 - Mon, Jun 15
Lufthansa Logo
8:05 pm - 7:05 pm
BOS
-
KGS
16h 00m
1 stop
Lufthansa Logo
9:45 am - 11:54 pm
KGS
-
BOS
45h 09m
2 stops
$1,050Lufthansa
Tue, Jul 7 - Mon, Aug 24
Lufthansa Logo
2:15 pm - 7:05 pm
BOS
-
KGS
21h 50m
2 stops
Lufthansa Logo
9:45 am - 11:54 pm
KGS
-
BOS
45h 09m
2 stops
$1,055Lufthansa
Tue, Jul 7 - Mon, Aug 24
SWISS Logo
5:20 pm - 8:00 pm
BOS
-
KGS
19h 40m
1 stop
SWISS Logo
11:00 am - 7:55 pm
KGS
-
BOS
15h 55m
1 stop
$1,063SWISS
Fri, Jul 10 - Thu, Aug 27

SWISS flights from Massachusetts to Kos

Our best SWISS deals on Massachusetts to Kos flight tickets
SWISS
Jul 7
BOS9:40 pmBoston Logan Intl
15h 15m
1 stop
KGS7:55 pmKos
Aug 25
KGS8:30 pmKos
25h 40m
1 stop
BOS3:10 pmBoston Logan Intl
$1,003
SWISS
Jul 10
BOS9:40 pmBoston Logan Intl
15h 20m
1 stop
KGS8:00 pmKos
Aug 24
KGS11:00 amKos
35h 10m
1 stop
BOS3:10 pmBoston Logan Intl
$1,021
SWISS
Jul 11
BOS9:40 pmBoston Logan Intl
29h 30m
1 stop
KGS10:10 amKos
Aug 25
KGS8:30 pmKos
25h 40m
1 stop
BOS3:10 pmBoston Logan Intl
$1,025

Austrian Airlines flights from Massachusetts to Kos

Our best Austrian Airlines deals on Massachusetts to Kos flight tickets
Austrian Airlines
Jul 7
BOS2:15 pmBoston Logan Intl
23h 35m
2 stops
KGS8:50 pmKos
Aug 27
KGS9:10 pmKos
23h 40m
1 stop
BOS1:50 pmBoston Logan Intl
$1,017
Austrian Airlines
Jul 9
BOS5:10 pmBoston Logan Intl
20h 40m
1 stop
KGS8:50 pmKos
Aug 25
KGS10:05 amKos
34h 45m
1 stop
BOS1:50 pmBoston Logan Intl
$1,071
Austrian Airlines
Jul 10
BOS10:58 amBoston Logan Intl
26h 37m
2 stops
KGS8:35 pmKos
Aug 25
KGS10:05 amKos
34h 45m
1 stop
BOS1:50 pmBoston Logan Intl
$1,077

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 May 4, 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 - KGS

BOSKGS

Boston Logan Intl

Tue 7/7

9:40 pm-10:10 am

1 stop29h 30m

Kos

Wed 8/26

8:40 pm-7:55 pm

1 stop30h 15m

$1,003

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 7/7

2:15 pm-8:50 pm

2 stops23h 35m

Kos

Thu 8/27

9:10 pm-1:50 pm

1 stop23h 40m

$1,017

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Fri 7/10

9:40 pm-8:00 pm

1 stop15h 20m

Kos

Mon 8/24

11:00 am-3:10 pm

1 stop35h 10m

$1,021

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sat 7/11

9:40 pm-10:10 am

1 stop29h 30m

Kos

Tue 8/25

8:30 pm-3:10 pm

1 stop25h 40m

$1,025

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 7/7

7:27 pm-7:05 pm

2 stops16h 38m

Kos

Wed 8/26

7:55 pm-5:40 pm

1 stop28h 45m

$1,026

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Fri 7/10

10:58 am-8:35 pm

2 stops26h 37m

Kos

Mon 8/24

11:00 am-3:10 pm

1 stop35h 10m

$1,031

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Mon 6/8

10:45 am-10:05 pm

2 stops28h 20m

Kos

Mon 6/15

6:00 am-9:45 am

3 stops34h 45m

$1,040

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 7/7

8:05 pm-7:05 pm

1 stop16h 00m

Kos

Mon 8/24

9:45 am-11:54 pm

2 stops45h 09m

$1,050

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Tue 7/7

2:15 pm-7:05 pm

2 stops21h 50m

Kos

Mon 8/24

9:45 am-11:54 pm

2 stops45h 09m

$1,055
Quickest round-trip

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Fri 7/10

5:20 pm-8:00 pm

1 stop19h 40m

Kos

Thu 8/27

11:00 am-7:55 pm

1 stop15h 55m

$1,063

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
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See travel insights to Kos from

How to get the cheapest flight ticket from Massachusetts to Kos

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Massachusetts to Kos?

Brussels Airlines is the most popular carrier operating from Massachusetts to Kos

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

20h 45m

Direct flights

None
The fastest flight from Massachusetts to Kos takes 20h 45m
There are no direct flights from Massachusetts to Kos. There are no popular flight routes from Massachusetts to Kos.
Search flight deals

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 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.

Traveling to a place near Kos?

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

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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