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Cheap flights from Boston to Cardiff from £259

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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
11 Jun — 18 Jun1
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 12 May 2026.

Sat 6/618:50
BOS
-
CWL
2 stops34h 25m
Multiple Airlines
Wed 17/623:30
CWL
-
BOS
3 stops28h 08m
Multiple Airlines
Deal found 11/5£574
Sun 7/618:50
BOS
-
CWL
2 stops34h 25m
Multiple Airlines
Sat 13/607:30
CWL
-
BOS
2 stops20h 09m
Multiple Airlines
Deal found 8/5£583
Tue 9/618:50
BOS
-
CWL
2 stops34h 25m
Multiple Airlines
Mon 15/622:10
CWL
-
BOS
3 stops40h 35m
Multiple Airlines
Deal found 10/5£613
Tue 9/618:50
BOS
-
CWL
2 stops34h 25m
Multiple Airlines
Tue 16/623:15
CWL
-
BOS
3 stops28h 24m
Multiple Airlines
Deal found 10/5£633
Mon 8/605:50
BOS
-
CWL
2 stops23h 25m
Multiple Airlines
Thu 18/622:50
CWL
-
BOS
3 stops27h 05m
Multiple Airlines
Deal found 7/5£648

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 12 May 2026.

Round-trip from

£574

One-way from

£259

Popular in

May

Cheapest in

February

Average price

£1,235
6/6-17/6
  • 6/6-17/6
  • 5 total stops
  • 62h 33m total
  • Boston to Cardiff
Search Deals
8/6
  • 8/6
  • 2 total stops
  • 23h 25m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£180 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£33 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 12 May 2026.
Use the filters below to find and compare flights from Boston to Cardiff that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sat 6/6

18:50-10:15

2 stops34h 25m

Cardiff Wales

Wed 17/6

23:30-22:38

3 stops28h 08m

£574

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 8/6

15:25-10:15

2 stops13h 50m

Cardiff Wales

Thu 18/6

11:35-09:05

1 stop26h 30m

£659

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 1/6

05:50-22:50

3 stops36h 00m

Cardiff Wales

Wed 10/6

23:30-20:55

3 stops26h 25m

£670

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 23/6

07:10-23:05

2 stops34h 55m

Cardiff Wales

Mon 6/7

11:35-14:41

1 stop32h 06m

£673

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 6/9

16:40-09:15

1 stop11h 35m

Cardiff Wales

Mon 14/9

09:45-13:19

1 stop32h 34m

£767
Fastest return journey

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 6/9

16:40-09:15

1 stop11h 35m

Cardiff Wales

Mon 14/9

09:45-23:32

2 stops18h 47m

£778
Cheapest one-way

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 8/6

10:05-10:15

1 stop19h 10m

£271

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Tue 23/6

18:35-23:05

2 stops23h 30m

£310

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 13/9

06:00-09:15

2 stops22h 15m

£314

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Fri 11/9

20:25-17:05

1 stop15h 40m

£348

Flights are sorted by cheapest return flights first.

Deals found on 9/5

Showing 1-10 of 11 resultsSorted by cheapest first
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, February is the cheapest month in which you can book a flight from Boston to Cardiff (average of £505). Flying from Boston to Cardiff in May is currently the most expensive (average of £1,235). 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.

How much does it cost for a return flight from Boston to Cardiff?

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, February is the cheapest month in which you can book a flight from Boston to Cardiff (average of £505). Flying from Boston to Cardiff in May is currently the most expensive (average of £1,235). 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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