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Cheap flights from Boston to Cardiff from £418

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
7 Jul — 14 Jul1
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 2 July 2025.

Round-trip from

£418

Popular in

June

Cheapest in

February

Average price

£1,038
14/8-21/8
  • 14/8-21/8
  • 2 total stops
  • 21h 20m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£152 potential increase over avg. return price).
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Cheapest flight prices on average. 6% potential price decrease (£35 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 2 July 2025.

Thu 14/821:25BOS - CWL
1 stop9h 35mMultiple Airlines
Thu 21/807:55CWL - BOS
1 stop11h 45mMultiple Airlines
Deal found 30/6£418
Sun 3/816:50BOS - CWL
1 stop11h 25mDelta
Tue 19/809:50CWL - BOS
1 stop13h 35mDelta
Deal found 30/6£495
Sun 14/916:50BOS - CWL
1 stop11h 25mKLM
Sat 20/917:35CWL - BOS
1 stop25h 05mKLM
Deal found 30/6£638
Wed 20/813:08BOS - CWL
2 stops22h 37mAir France
Mon 25/817:15CWL - BOS
2 stops27h 45mAir France
Deal found 30/6£643

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 2 July 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

Thu 14/8

21:25-12:00

1 stop9h 35m

Cardiff Wales

Thu 21/8

07:55-14:40

1 stop11h 45m

£418

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 3/8

16:50-09:15

1 stop11h 25m

Cardiff Wales

Tue 19/8

09:50-18:25

1 stop13h 35m

£495

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 14/9

16:50-09:15

1 stop11h 25m

Cardiff Wales

Sat 20/9

17:35-13:40

1 stop25h 05m

£638

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 20/8

13:08-16:45

2 stops22h 37m

Cardiff Wales

Mon 25/8

17:15-16:00

2 stops27h 45m

£643

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 14/9

17:05-16:45

2 stops42h 40m

Cardiff Wales

Sat 20/9

09:45-13:40

2 stops32h 55m

£1,007

Flights are sorted by cheapest return flights first.

Deals found on 30/6

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.

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 2 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andAir France from Boston to Cardiff. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,975 reviews
Check prices

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very Good
7,975 reviews
Delta
8.0
Very Good
7,975 reviews
Check prices

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,366 reviews
Delta
8.0
Very Good
7,975 reviews
Check prices

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,472 reviews
Delta
8.0
Very Good
7,975 reviews
Check prices

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
ITA Airways
6.6
Okay
998 reviews
Delta
8.0
Very Good
7,975 reviews
Check prices

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 £495. Other airlines that can offer you cheap pricing are KLM, from £638, and Air France, from £643. Delta is 36% 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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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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