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Cheap flights from Boston to Kos from $797

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Boston 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
3:15 pm - 3:10 pm
KGS
-
BOS
30h 55m
1 stop
$1,649SWISS
Sat, Aug 8 - Sun, Aug 23
Multiple Airlines Logo
9:40 pm - 10:10 am
BOS
-
KGS
29h 30m
1 stop
Multiple Airlines Logo
10:00 am - 5:55 pm
KGS
-
BOS
38h 55m
2 stops
$1,667Multiple Airlines
Sat, Aug 8 - Sun, Aug 23
Multiple Airlines Logo
8:05 pm - 10:25 am
BOS
-
KGS
31h 20m
2 stops
Multiple Airlines Logo
10:00 am - 5:55 pm
KGS
-
BOS
38h 55m
2 stops
$1,709Multiple Airlines
Sat, Aug 8 - Sun, Aug 23
Emirates Logo
11:05 pm - 5:30 pm
BOS
-
KGS
35h 25m
2 stops
Emirates Logo
6:10 pm - 2:10 pm
KGS
-
BOS
51h 00m
2 stops
$1,827Emirates
Sun, Sep 6 - Thu, Sep 10
Multiple Airlines Logo
10:05 am - 12:35 pm
BOS
-
KGS
19h 30m
2 stops
Multiple Airlines Logo
6:00 am - 6:19 pm
KGS
-
BOS
19h 19m
2 stops
$2,185Multiple Airlines
Mon, Apr 6 - Wed, Apr 15
Emirates Logo
11:05 pm - 5:30 pm
BOS
-
KGS
35h 25m
2 stops
Emirates Logo
6:10 pm - 2:10 pm
KGS
-
BOS
51h 00m
2 stops
$2,226Emirates
Sun, Sep 6 - Thu, Sep 10
Multiple Airlines Logo
11:17 am - 12:35 pm
BOS
-
KGS
18h 18m
2 stops
Multiple Airlines Logo
6:00 am - 3:40 pm
KGS
-
BOS
16h 40m
2 stops
$2,508Multiple Airlines
Mon, Apr 6 - Wed, Apr 15
Multiple Airlines Logo
10:05 am - 12:35 pm
BOS
-
KGS
19h 30m
2 stops
Multiple Airlines Logo
6:00 am - 7:55 pm
KGS
-
BOS
20h 55m
2 stops
$2,728Multiple Airlines
Mon, Apr 6 - Wed, Apr 15
Multiple Airlines Logo
11:30 am - 7:55 pm
BOS
-
KGS
25h 25m
2 stops
Multiple Airlines Logo
8:55 pm - 7:50 pm
KGS
-
BOS
29h 55m
3 stops
$4,094Multiple Airlines
Sat, Aug 8 - Sun, Aug 23
Multiple Airlines Logo
5:40 pm - 7:55 pm
BOS
-
KGS
19h 15m
2 stops
Multiple Airlines Logo
8:55 pm - 7:50 pm
KGS
-
BOS
29h 55m
3 stops
$4,109Multiple Airlines
Sat, Aug 8 - Sun, Aug 23

Emirates flights from Boston to Kos

Our best Emirates deals on Boston to Kos flight tickets
Emirates
Sep 6
BOS11:05 pmBoston Logan Intl
35h 25m
2 stops
KGS5:30 pmKos
Sep 10
KGS6:10 pmKos
51h 00m
2 stops
BOS2:10 pmBoston Logan Intl
$1,827
Emirates
Sep 6
BOS11:05 pmBoston Logan Intl
35h 25m
2 stops
KGS5:30 pmKos
Sep 10
KGS6:10 pmKos
51h 00m
2 stops
BOS2:10 pmBoston Logan Intl
$2,226
Emirates
May 5
BOS11:05 pmBoston Logan Intl
59h 30m
2 stops
KGS5:35 pmKos
May 12
KGS1:05 pmKos
56h 05m
2 stops
BOS2:10 pmBoston Logan Intl
$6,862

momondo 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, momondo users made 832,500 searches. Data last updated March 25, 2026.
Use the filters below to find and compare flights from Boston 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

Sat 8/8

9:40 pm-10:10 am

1 stop29h 30m

Kos

Sun 8/23

3:15 pm-3:10 pm

1 stop30h 55m

$1,649

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sat 8/8

9:40 pm-10:10 am

1 stop29h 30m

Kos

Sun 8/23

10:00 am-5:55 pm

2 stops38h 55m

$1,667

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sat 8/8

8:05 pm-10:25 am

2 stops31h 20m

Kos

Sun 8/23

10:00 am-5:55 pm

2 stops38h 55m

$1,709

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sun 9/6

11:05 pm-5:30 pm

2 stops35h 25m

Kos

Thu 9/10

6:10 pm-2:10 pm

2 stops51h 00m

$1,827

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Mon 4/6

10:05 am-12:35 pm

2 stops19h 30m

Kos

Wed 4/15

6:00 am-6:19 pm

2 stops19h 19m

$2,185

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sun 9/6

11:05 pm-5:30 pm

2 stops35h 25m

Kos

Thu 9/10

6:10 pm-2:10 pm

2 stops51h 00m

$2,226
Quickest round-trip

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Mon 4/6

11:17 am-12:35 pm

2 stops18h 18m

Kos

Wed 4/15

6:00 am-3:40 pm

2 stops16h 40m

$2,508

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Mon 4/6

10:05 am-12:35 pm

2 stops19h 30m

Kos

Wed 4/15

6:00 am-7:55 pm

2 stops20h 55m

$2,728

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sat 8/8

11:30 am-7:55 pm

2 stops25h 25m

Kos

Sun 8/23

8:55 pm-7:50 pm

3 stops29h 55m

$4,094

BostonKos

BOS - KGS

BOSKGS

Boston Logan Intl

Sat 8/8

5:40 pm-7:55 pm

2 stops19h 15m

Kos

Sun 8/23

8:55 pm-7:50 pm

3 stops29h 55m

$4,109

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to Kos from

How to get the cheapest flight ticket from Boston 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 Boston Logan Intl to Kos?

Brussels Airlines is the most popular carrier operating from Boston Logan Intl to Kos

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

Fastest flight time

18h 18m

Direct flights

None
The fastest flight from Boston to Kos takes 18h 18m
There are no direct flights from Boston to Kos. There are no popular flight routes from Boston to Kos.
Search flight deals

  • 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 18h 18m.

  • 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 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.

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 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.

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