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Cheap flights from Boston to Cardiff from $262

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 2/23. 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 Boston to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:15 pm - 3:30 pm
BOS
-
CWL
13h 15m
1 stop
Multiple Airlines Logo
11:30 pm - 8:55 pm
CWL
-
BOS
26h 25m
2 stops
$649Multiple Airlines
Tue, Feb 24 - Mon, Mar 2
KLM Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m
1 stop
KLM Logo
5:15 pm - 1:20 pm
CWL
-
BOS
25h 05m
1 stop
$687KLM
Tue, Feb 24 - Mon, Mar 2
KLM Logo
7:10 pm - 4:55 pm
BOS
-
CWL
16h 45m
1 stop
KLM Logo
5:15 pm - 1:20 pm
CWL
-
BOS
25h 05m
1 stop
$691KLM
Tue, Feb 24 - Mon, Mar 2
Delta Logo
11:00 am - 9:50 am
BOS
-
CWL
18h 50m
2 stops
Delta Logo
9:45 am - 1:13 pm
CWL
-
BOS
32h 28m
1 stop
$693Delta
Sun, Mar 15 - Tue, Mar 31
KLM Logo
1:04 pm - 9:50 am
BOS
-
CWL
15h 46m
2 stops
KLM Logo
5:15 pm - 1:20 pm
CWL
-
BOS
25h 05m
1 stop
$696KLM
Tue, Feb 24 - Mon, Mar 2
Delta Logo
9:00 am - 9:50 am
BOS
-
CWL
20h 50m
2 stops
Delta Logo
9:45 am - 4:25 pm
CWL
-
BOS
35h 40m
2 stops
$699Delta
Sun, Mar 15 - Tue, Mar 31
Delta Logo
1:04 pm - 9:50 am
BOS
-
CWL
15h 46m
2 stops
Delta Logo
10:20 am - 11:26 pm
CWL
-
BOS
18h 06m
2 stops
$752Delta
Tue, Feb 24 - Mon, Mar 2
Delta Logo
6:45 pm - 4:55 pm
BOS
-
CWL
17h 10m
2 stops
Delta Logo
10:20 am - 10:48 pm
CWL
-
BOS
17h 28m
2 stops
$756Delta
Tue, Feb 24 - Mon, Mar 2
Delta Logo
11:15 am - 9:50 am
BOS
-
CWL
17h 35m
2 stops
Delta Logo
10:20 am - 10:48 pm
CWL
-
BOS
17h 28m
2 stops
$765Delta
Thu, Feb 26 - Thu, Mar 5
KLM Logo
9:50 pm - 4:55 pm
BOS
-
CWL
15h 05m
1 stop
KLM Logo
5:25 pm - 2:20 pm
CWL
-
BOS
24h 55m
1 stop
$791KLM
Wed, Mar 11 - Wed, Mar 18

Delta flights from Boston to Cardiff

Our best Delta deals on Boston to Cardiff flight tickets
Delta
Mar 15
BOS11:00 amBoston Logan Intl
18h 50m
2 stops
CWL9:50 amCardiff Wales
Mar 31
CWL9:45 amCardiff Wales
32h 28m
1 stop
BOS1:13 pmBoston Logan Intl
$693
Delta
Mar 15
BOS9:00 amBoston Logan Intl
20h 50m
2 stops
CWL9:50 amCardiff Wales
Mar 31
CWL9:45 amCardiff Wales
35h 40m
2 stops
BOS4:25 pmBoston Logan Intl
$699
Delta
Feb 24
BOS1:04 pmBoston Logan Intl
15h 46m
2 stops
CWL9:50 amCardiff Wales
Mar 2
CWL10:20 amCardiff Wales
18h 06m
2 stops
BOS11:26 pmBoston Logan Intl
$752

KLM flights from Boston to Cardiff

Our best KLM deals on Boston to Cardiff flight tickets
KLM
Feb 24
BOS7:10 pmBoston Logan Intl
9h 40m
1 stop
CWL9:50 amCardiff Wales
Mar 2
CWL5:15 pmCardiff Wales
25h 05m
1 stop
BOS1:20 pmBoston Logan Intl
$687
KLM
Feb 24
BOS7:10 pmBoston Logan Intl
16h 45m
1 stop
CWL4:55 pmCardiff Wales
Mar 2
CWL5:15 pmCardiff Wales
25h 05m
1 stop
BOS1:20 pmBoston Logan Intl
$691
KLM
Feb 24
BOS1:04 pmBoston Logan Intl
15h 46m
2 stops
CWL9:50 amCardiff Wales
Mar 2
CWL5:15 pmCardiff Wales
25h 05m
1 stop
BOS1:20 pmBoston Logan Intl
$696

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 January 29, 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

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

9:15 pm-3:30 pm

1 stop13h 15m

Cardiff Wales

Mon 3/2

11:30 pm-8:55 pm

2 stops26h 25m

$649

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

7:10 pm-9:50 am

1 stop9h 40m

Cardiff Wales

Mon 3/2

5:15 pm-1:20 pm

1 stop25h 05m

$687

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

7:10 pm-4:55 pm

1 stop16h 45m

Cardiff Wales

Mon 3/2

5:15 pm-1:20 pm

1 stop25h 05m

$691

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 3/15

11:00 am-9:50 am

2 stops18h 50m

Cardiff Wales

Tue 3/31

9:45 am-1:13 pm

1 stop32h 28m

$693

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

1:04 pm-9:50 am

2 stops15h 46m

Cardiff Wales

Mon 3/2

5:15 pm-1:20 pm

1 stop25h 05m

$696

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 3/15

9:00 am-9:50 am

2 stops20h 50m

Cardiff Wales

Tue 3/31

9:45 am-4:25 pm

2 stops35h 40m

$699

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

1:04 pm-9:50 am

2 stops15h 46m

Cardiff Wales

Mon 3/2

10:20 am-11:26 pm

2 stops18h 06m

$752

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 2/24

6:45 pm-4:55 pm

2 stops17h 10m

Cardiff Wales

Mon 3/2

10:20 am-10:48 pm

2 stops17h 28m

$756

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 2/26

11:15 am-9:50 am

2 stops17h 35m

Cardiff Wales

Thu 3/5

10:20 am-10:48 pm

2 stops17h 28m

$765

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 3/11

9:50 pm-4:55 pm

1 stop15h 05m

Cardiff Wales

Wed 3/18

5:25 pm-2:20 pm

1 stop24h 55m

$791

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
1
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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 January is, on average, the cheapest month to fly to Cardiff from Boston, with most prices found around $735. If you aren’t able to travel to Cardiff during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $774.

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

15h 05m

Direct flights

None
The fastest flight from Boston to Cardiff takes 15h 05m
There are no direct flights from Boston to Cardiff. There are no popular flight routes from Boston to Cardiff.
Search flight deals

  • 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 15h 05m.

  • 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 many operators does momondo search for flights from Boston Logan Intl Airport to Cardiff Wales Airport?

  • 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.

  • What is the most popular airline from Boston to Cardiff?

Best airlines flying from Boston to Cardiff

Compare and see reviews for airlines that fly from Boston to Cardiff with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $644Free CancellationRating
7.7
1,443 reviews
Search KLM flights
DeltaPriceFrom $791Free CancellationRating
7.9
8,127 reviews
Search Delta flights

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

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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Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Aer Lingus
KLM
Delta