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Cheap flights from Boston to Cardiff from £507

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
25 Feb — 4 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Boston to Cardiff

Enter your travel dates to find the best prices.

Cheapest flights from Boston to Cardiff
Explore the most affordable flight options available from Boston to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 January 2026.

Tue 10/313:55
BOS
-
CWL
2 stops15h 55m
KLM
Tue 17/317:25
CWL
-
BOS
1 stop24h 55m
KLM
Deal found 24/1£507
Wed 11/309:05
BOS
-
CWL
2 stops20h 45m
KLM
Wed 18/310:20
CWL
-
BOS
1 stop13h 35m
KLM
Deal found 25/1£511
Tue 10/312:45
BOS
-
CWL
2 stops17h 05m
Delta
Tue 17/310:20
CWL
-
BOS
2 stops17h 33m
Delta
Deal found 24/1£514
Wed 11/321:50
BOS
-
CWL
1 stop15h 05m
Multiple Airlines
Wed 18/310:20
CWL
-
BOS
1 stop13h 35m
Multiple Airlines
Deal found 25/1£534
Sun 6/916:40
BOS
-
CWL
1 stop19h 05m
Air France
Mon 14/909:45
CWL
-
BOS
1 stop11h 50m
Air France
Deal found 24/1£550
Wed 28/120:50
BOS
-
CWL
1 stop15h 05m
KLM
Fri 30/110:20
CWL
-
BOS
2 stops17h 02m
KLM
Deal found 24/1£566
Sun 6/916:40
BOS
-
CWL
1 stop11h 35m
Delta
Mon 14/909:45
CWL
-
BOS
2 stops17h 51m
Delta
Deal found 25/1£606
Wed 16/916:40
BOS
-
CWL
1 stop19h 05m
Air France
Sat 19/909:45
CWL
-
BOS
1 stop11h 50m
Air France
Deal found 24/1£608

Find flight deals from Boston to Cardiff

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Cardiff (CWL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 January 2026.

Round-trip from

£507

Popular in

June

Cheapest in

January

Average price

£538
KLM
  • KLM
  • 10/3-17/3
  • 3 total stops
  • 40h 50m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£111 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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, Cheapflights users made 858,174 searches. Data last updated 26 January 2026.
Use the filters below to find and compare flights from Boston to Cardiff that are best for you.

Fly from

Boston

Fly to

Cardiff

Route

Depart

Return

Price

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 10/3

13:55-09:50

2 stops15h 55m

Cardiff Wales

Tue 17/3

17:25-14:20

1 stop24h 55m

£507

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 11/3

09:05-09:50

2 stops20h 45m

Cardiff Wales

Wed 18/3

10:20-19:55

1 stop13h 35m

£511

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 10/3

12:45-09:50

2 stops17h 05m

Cardiff Wales

Tue 17/3

10:20-23:53

2 stops17h 33m

£514

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 11/3

21:50-16:55

1 stop15h 05m

Cardiff Wales

Wed 18/3

10:20-19:55

1 stop13h 35m

£534

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sat 18/4

08:10-09:15

2 stops20h 05m

Cardiff Wales

Wed 22/4

09:45-16:25

1 stop11h 40m

£665

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sat 18/4

08:10-09:15

2 stops20h 05m

Cardiff Wales

Tue 21/4

09:45-16:25

1 stop11h 40m

£665

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sat 18/4

08:10-09:15

2 stops20h 05m

Cardiff Wales

Mon 20/4

09:45-18:30

1 stop13h 45m

£665

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 16/4

12:30-09:15

2 stops15h 45m

Cardiff Wales

Wed 22/4

09:45-18:30

1 stop13h 45m

£709

Flights are sorted by cheapest return flights first.

Deals found on 24/1

Best time to book a flight from Boston to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Boston with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Cardiff

What is the cheapest month to book a flight from Boston to Cardiff?

Currently, April is the cheapest month in which you can book a flight from Boston to Cardiff (average of £160). Flying from Boston to Cardiff in June is currently the most expensive (average of £776). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Boston to Cardiff. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Boston to Cardiff?

    KLM and Delta can get you from Boston to Cardiff in just under 15h 55m. Your travel time can differ by up to 1h 10m. Boston and Cardiff are separated by a distance of 3137 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Boston to Cardiff that include hotel bookings?

    Yes. In addition to deals on Boston to Cardiff flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Boston to Cardiff?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Cardiff.

  • Can I find deals for business class flights from Boston to Cardiff?

    Yes. Cheapflights offers flight deals from Boston to Cardiff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Cardiff?

    Currently, April is the cheapest month in which you can book a flight from Boston to Cardiff (average of £160). Flying from Boston to Cardiff in June is currently the most expensive (average of £776). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Cardiff?

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

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How does Cheapflights help users find flights from Boston to Cardiff?

Cheapflights makes it easy to find Boston to Cardiff flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Boston to Cardiff?

Cheapflights helps you find that perfect flight to Cardiff from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Boston to Cardiff with no change fees?

Yes, we can. To see specific flights from Boston to Cardiff with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Boston to Cardiff become cheaper?

Yes, Cheapflights offers price alerts on Boston to Cardiff flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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