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Cheap flights from Boston to Cardiff from £400

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
20 Aug — 27 Aug1
1 adult

Cheap 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 15 August 2025.

Round-trip from

£400

Popular in

November

Cheapest in

February

Average price

£616
28/9-5/10
  • 28/9-5/10
  • 4 total stops
  • 49h 55m total
  • Boston to Cardiff
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Highest demand for flights based on searches. 7% potential increase in price (£42 potential increase over avg. return price).
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Cheapest flight prices on average. 6% potential price decrease (£33 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Boston to Cardiff

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 15 August 2025.

Sun 28/915:15BOS - CWL
2 stops16h 30mMultiple Airlines
Sun 5/1011:00CWL - BOS
2 stops33h 25mMultiple Airlines
Deal found 13/8£400
Mon 6/1014:45BOS - CWL
2 stops20h 10mMultiple Airlines
Fri 10/1012:25CWL - BOS
1 stop11h 20mMultiple Airlines
Deal found 13/8£546
Wed 3/920:15BOS - CWL
1 stop32h 00mKLM
Wed 10/917:15CWL - BOS
1 stop25h 25mKLM
Deal found 13/8£583
Wed 3/913:08BOS - CWL
2 stops15h 07mDelta
Wed 10/909:50CWL - BOS
1 stop13h 35mDelta
Deal found 13/8£586
Thu 27/1119:05BOS - CWL
1 stop9h 45mKLM
Mon 1/1210:20CWL - BOS
1 stop32h 00mKLM
Deal found 14/8£619
Thu 27/1119:10BOS - CWL
1 stop9h 40mDelta
Mon 1/1210:20CWL - BOS
2 stops17h 08mDelta
Deal found 14/8£627

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 15 August 2025.
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

Sun 28/9

15:15-12:45

2 stops16h 30m

Cardiff Wales

Sun 5/10

11:00-15:25

2 stops33h 25m

£400

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 6/10

14:45-15:55

2 stops20h 10m

Cardiff Wales

Fri 10/10

12:25-18:45

1 stop11h 20m

£546

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 8/9

16:50-16:45

1 stop18h 55m

Cardiff Wales

Fri 12/9

09:50-16:30

1 stop11h 40m

£583

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 3/9

20:15-09:15

1 stop32h 00m

Cardiff Wales

Wed 10/9

17:15-13:40

1 stop25h 25m

£583

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 3/9

13:08-09:15

2 stops15h 07m

Cardiff Wales

Wed 10/9

09:50-18:25

1 stop13h 35m

£586

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 6/10

18:22-16:45

2 stops17h 23m

Cardiff Wales

Fri 10/10

09:50-22:27

2 stops17h 37m

£593

Flights are sorted by cheapest return flights first.

Deals found on 13/8

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, July is the cheapest month in which you can book a flight from Boston to Cardiff (average of £169). Flying from Boston to Cardiff in December is currently the most expensive (average of £263). 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.

  • 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, July is the cheapest month in which you can book a flight from Boston to Cardiff (average of £169). Flying from Boston to Cardiff in December is currently the most expensive (average of £263). 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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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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