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Cheap flights from Boston to Cardiff from £358

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
31 Mar — 7 Apr1
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 26 March 2025.

Round-trip from

£628

One-way from

£358

Popular in

July

Cheapest in

February

Average price

£608
KLM
  • KLM
  • 13/5-19/5
  • 2 total stops
  • 47h 10m total
  • Boston to Cardiff
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Delta
  • Delta
  • 10/5
  • 1 total stop
  • 11h 35m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£154 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 26 March 2025.

Mon 17/1119:05BOS - CWL
1 stop9h 45mDelta
Tue 25/1110:20CWL - BOS
1 stop32h 00mDelta
Deal found 24/3£608
Sat 29/316:50BOS - CWL
1 stop11h 25mKLM
Mon 31/317:15CWL - BOS
1 stop25h 25mKLM
Deal found 25/3£613
Tue 6/510:00BOS - CWL
2 stops18h 15mVirgin Atlantic
Mon 19/509:50CWL - BOS
2 stops14h 16mVirgin Atlantic
Deal found 25/3£659
Thu 1/521:25BOS - CWL
1 stop9h 35mMultiple Airlines
Sat 10/521:30CWL - BOS
2 stops29h 40mMultiple Airlines
Deal found 25/3£730
Sun 15/617:05BOS - CWL
2 stops42h 40mITA Airways
Sat 21/609:45CWL - BOS
2 stops32h 55mITA Airways
Deal found 25/3£1,463
Thu 19/618:05BOS - CWL
2 stops42h 00mAir France
Tue 15/717:15CWL - BOS
1 stop28h 15mAir France
Deal found 25/3£3,132

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 March 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

Tue 13/5

18:40-16:45

1 stop17h 05m

Cardiff Wales

Mon 19/5

17:15-18:20

1 stop30h 05m

£628

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 13/5

13:00-09:15

2 stops15h 15m

Cardiff Wales

Mon 19/5

09:50-16:25

1 stop11h 35m

£637

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 6/5

10:00-09:15

2 stops18h 15m

Cardiff Wales

Mon 19/5

09:50-19:06

2 stops14h 16m

£659

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 1/5

21:25-12:00

1 stop9h 35m

Cardiff Wales

Sat 10/5

21:30-22:10

2 stops29h 40m

£730

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 15/6

17:05-16:45

2 stops42h 40m

Cardiff Wales

Sat 21/6

09:45-13:40

2 stops32h 55m

£1,463

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 19/6

18:05-17:05

2 stops42h 00m

Cardiff Wales

Tue 15/7

17:15-16:30

1 stop28h 15m

£3,132

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sat 10/5

16:40-09:15

1 stop11h 35m

£358

Flights are sorted by cheapest return flights first.

Deals found on 25/3

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.

Rainfall in Cardiff by month

Plan your trip to Cardiff by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Cardiff ranges from 50.0 - 90.0 inches per month. January is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Cardiff when rainfall is around 50.0 mm.

Temperature in Cardiff by month

Plan your trip to Cardiff by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Cardiff, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 18.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing Cardiff

Get insights into the airlines that provide service to Cardiff. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Cardiff. Reviews last updated 26 March 2025.
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very Good
7,891 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,319 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,423 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Virgin Atlantic
7.4
Good
634 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
ITA Airways
6.7
Okay
945 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • What are the cheapest airlines flying from Boston to Cardiff round-trip?

    Cheapflights users have booked flights from Boston to Cardiff round-trip from £628. Other airlines that can offer you cheap pricing are Delta, from £637, and Virgin Atlantic, from £659. KLM is 18% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 Boston?

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

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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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