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Cheap flights from Boston to Cardiff from £399

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
27 Dec — 3 Jan1
1 adult
1 adult, Economy, 0 bags

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 27 November 2025.

Round-trip from

£480

One-way from

£399

Popular in

June

Cheapest in

February

Average price

£612
9/1-16/1
  • 9/1-16/1
  • 3 total stops
  • 44h 55m total
  • Boston to Cardiff
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Aer Lingus
  • Aer Lingus
  • 31/12
  • 2 total stops
  • 43h 35m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£113 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find 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 27 November 2025.

Wed 31/1219:10BOS - CWL
1 stop9h 40mDelta
Thu 8/110:20CWL - BOS
2 stops34h 33mDelta
Deal found 26/11£495
Tue 30/1220:00BOS - CWL
2 stops32h 50mDelta
Thu 8/110:20CWL - BOS
2 stops37h 10mDelta
Deal found 26/11£504
Wed 31/1219:10BOS - CWL
1 stop9h 40mMultiple Airlines
Tue 6/110:20CWL - BOS
1 stop32h 10mMultiple Airlines
Deal found 26/11£507
Tue 30/1217:20BOS - CWL
1 stop8h 40mMultiple Airlines
Thu 8/110:30CWL - BOS
2 stops17h 26mMultiple Airlines
Deal found 26/11£511
Mon 29/1220:50BOS - CWL
1 stop32h 00mDelta
Thu 8/110:20CWL - BOS
2 stops41h 01mDelta
Deal found 26/11£583
Wed 31/1220:50BOS - CWL
1 stop15h 05mDelta
Wed 7/110:20CWL - BOS
1 stop13h 35mDelta
Deal found 26/11£608
Tue 30/1220:00BOS - CWL
2 stops32h 50mDelta
Wed 7/110:20CWL - BOS
1 stop13h 35mDelta
Deal found 26/11£620
Mon 29/1220:50BOS - CWL
1 stop32h 00mDelta
Wed 7/110:20CWL - BOS
1 stop13h 35mDelta
Deal found 26/11£695
Tue 30/1219:10BOS - CWL
1 stop9h 40mKLM
Tue 6/117:25CWL - BOS
1 stop30h 30mKLM
Deal found 26/11£698

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 27 November 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

Wed 31/12

19:10-09:50

1 stop9h 40m

Cardiff Wales

Thu 8/1

10:20-15:53

2 stops34h 33m

£495

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 30/12

20:00-09:50

2 stops32h 50m

Cardiff Wales

Thu 8/1

10:20-18:30

2 stops37h 10m

£504

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 4/2

20:50-09:50

1 stop32h 00m

Cardiff Wales

Sun 8/2

10:15-18:55

1 stop13h 40m

£532

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 29/12

20:50-09:50

1 stop32h 00m

Cardiff Wales

Thu 8/1

10:20-22:21

2 stops41h 01m

£583

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Fri 9/1

20:50-16:55

1 stop15h 05m

Cardiff Wales

Fri 16/1

10:20-18:55

1 stop13h 35m

£607

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 31/12

20:50-16:55

1 stop15h 05m

Cardiff Wales

Wed 7/1

10:20-18:55

1 stop13h 35m

£608

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 12/1

19:10-09:50

1 stop9h 40m

Cardiff Wales

Fri 16/1

10:20-13:30

1 stop32h 10m

£614

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 31/12

07:30-08:05

2 stops43h 35m

£399

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 1/1

17:20-12:05

2 stops13h 45m

£483

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 29/12

19:10-16:55

1 stop16h 45m

£506

Flights are sorted by cheapest return flights first.

Deals found on 26/11

Showing 1-10 of 16 results
1
2

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, October is the cheapest month in which you can book a flight from Boston to Cardiff (average of £451). Flying from Boston to Cardiff in June is currently the most expensive (average of £803). 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?

    Delta can get you from Boston to Cardiff in just under 9h 40m. Your travel time can differ by up to . Boston and Cardiff are separated by a distance of 3137 mi.

  • 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, October is the cheapest month in which you can book a flight from Boston to Cardiff (average of £451). Flying from Boston to Cardiff in June is currently the most expensive (average of £803). 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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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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