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Cheap flights from Boston to Cardiff from $324

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 Cardiff departing on 9/8. 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

Find the cheapest flights from Boston to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:50 pm - 10:50 pm
BOS
-
CWL
21h 00m
2 stops
Multiple Airlines Logo
11:15 pm - 6:50 pm
CWL
-
BOS
24h 35m
2 stops
$731Multiple Airlines
Mon, Sep 21 - Tue, Oct 6
Multiple Airlines Logo
8:50 pm - 10:50 pm
BOS
-
CWL
21h 00m
2 stops
Multiple Airlines Logo
11:15 pm - 6:50 pm
CWL
-
BOS
24h 35m
2 stops
$735Multiple Airlines
Mon, Sep 21 - Tue, Oct 6
Multiple Airlines Logo
5:25 pm - 10:50 pm
BOS
-
CWL
24h 25m
1 stop
Multiple Airlines Logo
9:45 pm - 9:05 pm
CWL
-
BOS
28h 20m
2 stops
$773Multiple Airlines
Mon, Sep 21 - Tue, Oct 6
Multiple Airlines Logo
5:25 pm - 10:50 pm
BOS
-
CWL
24h 25m
1 stop
Multiple Airlines Logo
9:45 pm - 9:05 pm
CWL
-
BOS
28h 20m
2 stops
$776Multiple Airlines
Mon, Sep 21 - Tue, Oct 6
Multiple Airlines Logo
9:40 pm - 9:45 pm
BOS
-
CWL
19h 05m
2 stops
Multiple Airlines Logo
9:45 pm - 2:41 pm
CWL
-
BOS
21h 56m
2 stops
$792Multiple Airlines
Sun, Sep 13 - Sun, Sep 20
Multiple Airlines Logo
5:45 pm - 11:25 pm
BOS
-
CWL
24h 40m
2 stops
Multiple Airlines Logo
10:10 pm - 2:41 pm
CWL
-
BOS
21h 31m
2 stops
$806Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
8:50 pm - 10:50 pm
BOS
-
CWL
21h 00m
3 stops
Multiple Airlines Logo
11:15 pm - 12:30 pm
CWL
-
BOS
42h 15m
3 stops
$808Multiple Airlines
Mon, Sep 21 - Tue, Oct 6
Multiple Airlines Logo
9:15 pm - 9:45 pm
BOS
-
CWL
19h 30m
1 stop
Multiple Airlines Logo
9:35 am - 4:10 pm
CWL
-
BOS
35h 35m
2 stops
$842Multiple Airlines
Sun, Sep 13 - Sun, Sep 20
Multiple Airlines Logo
5:45 am - 11:25 pm
BOS
-
CWL
36h 40m
3 stops
Multiple Airlines Logo
11:35 am - 9:50 am
CWL
-
BOS
27h 15m
2 stops
$883Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
5:10 pm - 9:15 am
BOS
-
CWL
35h 05m
3 stops
Multiple Airlines Logo
4:20 pm - 7:55 pm
CWL
-
BOS
32h 35m
2 stops
$906Multiple Airlines
Thu, Sep 17 - Thu, Sep 24

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Delta flights from Boston to Cardiff

Our best Delta deals on Boston to Cardiff flight tickets
Delta
Sep 21
BOS4:40 pmBoston Logan Intl
11h 35m
1 stop
CWL9:15 amCardiff Wales
Oct 6
CWL9:45 amCardiff Wales
11h 51m
1 stop
BOS4:36 pmBoston Logan Intl
$1,132
Delta
Nov 16
BOS1:35 pmBoston Logan Intl
15h 15m
2 stops
CWL9:50 amCardiff Wales
Nov 23
CWL10:20 amCardiff Wales
18h 36m
2 stops
BOS11:56 pmBoston Logan Intl
$1,166
Delta
Nov 16
BOS12:20 pmBoston Logan Intl
16h 30m
2 stops
CWL9:50 amCardiff Wales
Nov 23
CWL10:20 amCardiff Wales
18h 36m
2 stops
BOS11:56 pmBoston Logan Intl
$1,168

KLM flights from Boston to Cardiff

Our best KLM deals on Boston to Cardiff flight tickets
KLM
Nov 16
BOS7:25 pmBoston Logan Intl
9h 25m
1 stop
CWL9:50 amCardiff Wales
Nov 23
CWL5:30 pmCardiff Wales
25h 43m
1 stop
BOS2:13 pmBoston Logan Intl
$1,102
KLM
Nov 16
BOS7:25 pmBoston Logan Intl
9h 25m
1 stop
CWL9:50 amCardiff Wales
Nov 23
CWL5:30 pmCardiff Wales
25h 43m
1 stop
BOS2:13 pmBoston Logan Intl
$1,104
KLM
Nov 16
BOS1:00 pmBoston Logan Intl
15h 50m
2 stops
CWL9:50 amCardiff Wales
Nov 23
CWL5:30 pmCardiff Wales
25h 43m
1 stop
BOS2:13 pmBoston Logan Intl
$1,107

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Cardiff 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 3, 2026.
Use the filters below to find and compare flights from Boston to Cardiff that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 9/21

8:50 pm-10:50 pm

2 stops21h 00m

Cardiff Wales

Tue 10/6

11:15 pm-6:50 pm

2 stops24h 35m

$731

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 9/21

8:50 pm-10:50 pm

2 stops21h 00m

Cardiff Wales

Tue 10/6

11:15 pm-6:50 pm

2 stops24h 35m

$735

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 9/21

5:25 pm-10:50 pm

1 stop24h 25m

Cardiff Wales

Tue 10/6

9:45 pm-9:05 pm

2 stops28h 20m

$773

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 9/21

5:25 pm-10:50 pm

1 stop24h 25m

Cardiff Wales

Tue 10/6

9:45 pm-9:05 pm

2 stops28h 20m

$776
Quickest round-trip

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 9/13

9:40 pm-9:45 pm

2 stops19h 05m

Cardiff Wales

Sun 9/20

9:45 pm-2:41 pm

2 stops21h 56m

$792

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 9/1

5:45 pm-11:25 pm

2 stops24h 40m

Cardiff Wales

Mon 9/7

10:10 pm-2:41 pm

2 stops21h 31m

$806

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 9/21

8:50 pm-10:50 pm

3 stops21h 00m

Cardiff Wales

Tue 10/6

11:15 pm-12:30 pm

3 stops42h 15m

$808

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 9/13

9:15 pm-9:45 pm

1 stop19h 30m

Cardiff Wales

Sun 9/20

9:35 am-4:10 pm

2 stops35h 35m

$842

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 9/1

5:45 am-11:25 pm

3 stops36h 40m

Cardiff Wales

Mon 9/7

11:35 am-9:50 am

2 stops27h 15m

$883

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 9/17

5:10 pm-9:15 am

3 stops35h 05m

Cardiff Wales

Thu 9/24

4:20 pm-7:55 pm

2 stops32h 35m

$906

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Cardiff from

How to get the cheapest flight ticket from Boston to Cardiff

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 month to fly to Cardiff?

The month of December is, on average, the cheapest month to fly to Cardiff from Boston, with most prices found around $0. If you aren’t able to travel to Cardiff during the month of December, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $0.

When to book flights from Boston to Cardiff

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

Cheap Boston to Cardiff (BOS to CWL) flight deals and tips

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

Fastest flight time

8h 30m

Direct flights

None
The fastest flight from Boston to Cardiff takes 8h 30m
There are no direct flights from Boston to Cardiff. There are no popular flight routes from Boston to Cardiff.
Search flight deals

Frequently asked questions about flying from Boston to Cardiff

  • How far is Boston Logan Intl to Cardiff Wales by plane?

    There are 3144.0 mi between Boston Logan Intl and Cardiff Wales. By plane, this route typically takes 8h 30m.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Cardiff Wales Airport?

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

  • How old do you have to be to fly from Boston Logan Intl Airport to Cardiff Wales 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 Cardiff Wales Airport.

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

    The necessary travel and health documents for your Cardiff Wales 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 Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Bridgend

Why use momondo?

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

Finding the right flight to Cardiff from Boston is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Cardiff quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Boston to Cardiff flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Boston and Cardiff by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of Boston to Cardiff flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Cardiff trip

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Aer Lingus