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Cheap flights from Boston to Cardiff from $828

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Cardiff departing on 4/27. 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 Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:30 pm - 10:50 pm
BOS
-
CWL
18h 20m
1 stop
Multiple Airlines Logo
10:10 pm - 9:05 pm
CWL
-
BOS
51h 55m
2 stops
$828Multiple Airlines
Mon, Apr 27 - Mon, May 4
Multiple Airlines Logo
9:15 pm - 10:25 pm
BOS
-
CWL
20h 10m
1 stop
Multiple Airlines Logo
11:30 pm - 9:05 pm
CWL
-
BOS
26h 35m
2 stops
$833Multiple Airlines
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
5:25 pm - 10:25 pm
BOS
-
CWL
24h 00m
1 stop
Multiple Airlines Logo
11:30 pm - 6:50 pm
CWL
-
BOS
24h 20m
1 stop
$874Multiple Airlines
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
5:25 pm - 6:55 am
BOS
-
CWL
8h 30m
1 stop
Multiple Airlines Logo
10:10 pm - 7:55 pm
CWL
-
BOS
26h 45m
2 stops
$892Multiple Airlines
Fri, Apr 24 - Mon, Apr 27
KLM Logo
8:25 pm - 9:15 am
BOS
-
CWL
31h 50m
1 stop
KLM Logo
9:45 am - 1:10 pm
CWL
-
BOS
32h 25m
1 stop
$893KLM
Mon, Apr 27 - Mon, May 4
Multiple Airlines Logo
11:30 pm - 10:20 pm
BOS
-
CWL
17h 50m
1 stop
Multiple Airlines Logo
4:55 pm - 9:05 pm
CWL
-
BOS
33h 10m
2 stops
$900Multiple Airlines
Thu, Apr 30 - Thu, May 7
Multiple Airlines Logo
5:40 pm - 1:05 pm
BOS
-
CWL
38h 25m
2 stops
Multiple Airlines Logo
9:10 pm - 7:50 pm
CWL
-
BOS
27h 40m
2 stops
$917Multiple Airlines
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
5:25 pm - 6:55 am
BOS
-
CWL
8h 30m
1 stop
Multiple Airlines Logo
10:25 pm - 6:50 pm
CWL
-
BOS
25h 25m
1 stop
$941Multiple Airlines
Fri, Aug 21 - Mon, Aug 31
KLM Logo
4:45 pm - 4:45 pm
BOS
-
CWL
19h 00m
1 stop
KLM Logo
5:15 pm - 4:37 pm
CWL
-
BOS
28h 22m
1 stop
$943KLM
Tue, Aug 11 - Sun, Aug 23
KLM Logo
1:10 pm - 9:15 am
BOS
-
CWL
15h 05m
2 stops
KLM Logo
5:15 pm - 4:37 pm
CWL
-
BOS
28h 22m
1 stop
$948KLM
Tue, Aug 11 - Sun, Aug 23

KLM flights from Boston to Cardiff

Our best KLM deals on Boston to Cardiff flight tickets
KLM
Apr 27
BOS8:25 pmBoston Logan Intl
31h 50m
1 stop
CWL9:15 amCardiff Wales
May 4
CWL9:45 amCardiff Wales
32h 25m
1 stop
BOS1:10 pmBoston Logan Intl
$893
KLM
Aug 11
BOS4:45 pmBoston Logan Intl
19h 00m
1 stop
CWL4:45 pmCardiff Wales
Aug 23
CWL5:15 pmCardiff Wales
28h 22m
1 stop
BOS4:37 pmBoston Logan Intl
$943
KLM
Aug 11
BOS1:10 pmBoston Logan Intl
15h 05m
2 stops
CWL9:15 amCardiff Wales
Aug 23
CWL5:15 pmCardiff Wales
28h 22m
1 stop
BOS4:37 pmBoston Logan Intl
$948

Delta flights from Boston to Cardiff

Our best Delta deals on Boston to Cardiff flight tickets
Delta
Sep 6
BOS7:00 pmBoston Logan Intl
9h 15m
1 stop
CWL9:15 amCardiff Wales
Sep 14
CWL9:45 amCardiff Wales
17h 51m
2 stops
BOS10:36 pmBoston Logan Intl
$954
Delta
Aug 11
BOS1:10 pmBoston Logan Intl
15h 05m
2 stops
CWL9:15 amCardiff Wales
Aug 23
CWL9:50 amCardiff Wales
19h 06m
2 stops
BOS11:56 pmBoston Logan Intl
$958
Delta
Apr 27
BOS12:30 pmBoston Logan Intl
15h 45m
2 stops
CWL9:15 amCardiff Wales
May 4
CWL9:45 amCardiff Wales
18h 42m
2 stops
BOS11:27 pmBoston Logan Intl
$1,037

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 March 18, 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 4/27

11:30 pm-10:50 pm

1 stop18h 20m

Cardiff Wales

Mon 5/4

10:10 pm-9:05 pm

2 stops51h 55m

$828

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 4/29

9:15 pm-10:25 pm

1 stop20h 10m

Cardiff Wales

Wed 5/6

11:30 pm-9:05 pm

2 stops26h 35m

$833

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 4/29

5:25 pm-10:25 pm

1 stop24h 00m

Cardiff Wales

Wed 5/6

11:30 pm-6:50 pm

1 stop24h 20m

$874

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Fri 4/24

5:25 pm-6:55 am

1 stop8h 30m

Cardiff Wales

Mon 4/27

10:10 pm-7:55 pm

2 stops26h 45m

$892

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 4/27

8:25 pm-9:15 am

1 stop31h 50m

Cardiff Wales

Mon 5/4

9:45 am-1:10 pm

1 stop32h 25m

$893

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 4/30

11:30 pm-10:20 pm

1 stop17h 50m

Cardiff Wales

Thu 5/7

4:55 pm-9:05 pm

2 stops33h 10m

$900

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 4/29

5:40 pm-1:05 pm

2 stops38h 25m

Cardiff Wales

Wed 5/6

9:10 pm-7:50 pm

2 stops27h 40m

$917
Quickest round-trip

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Fri 8/21

5:25 pm-6:55 am

1 stop8h 30m

Cardiff Wales

Mon 8/31

10:25 pm-6:50 pm

1 stop25h 25m

$941

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 8/11

4:45 pm-4:45 pm

1 stop19h 00m

Cardiff Wales

Sun 8/23

5:15 pm-4:37 pm

1 stop28h 22m

$943

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 8/11

1:10 pm-9:15 am

2 stops15h 05m

Cardiff Wales

Sun 8/23

5:15 pm-4:37 pm

1 stop28h 22m

$948

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 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 typical price of a round-trip flight between Boston and Cardiff?

What is the cheapest month to fly to Cardiff?

The month of February is, on average, the cheapest month to fly to Cardiff from Boston, with most prices found around $687. If you aren’t able to travel to Cardiff during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $735.

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

  • 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 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
7.8
1,471 reviews
Search KLM flights
DeltaPriceFrom $793Free CancellationRating
7.9
8,287 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

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