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Cheap flights from Boston to Cardiff from £423

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
28 Apr — 5 May1
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 29 March 2026.

Tue 12/523:30
BOS
-
CWL
1 stop18h 35m
Multiple Airlines
Tue 19/516:15
CWL
-
BOS
2 stops33h 50m
Multiple Airlines
Deal found 28/3£562
Fri 8/517:25
BOS
-
CWL
1 stop8h 30m
Multiple Airlines
Fri 15/517:45
CWL
-
BOS
2 stops32h 20m
Multiple Airlines
Deal found 24/3£565
Mon 6/417:20
BOS
-
CWL
1 stop24h 30m
Multiple Airlines
Tue 14/421:45
CWL
-
BOS
2 stops52h 20m
Multiple Airlines
Deal found 26/3£620
Tue 26/520:30
BOS
-
CWL
1 stop32h 45m
Multiple Airlines
Mon 8/611:35
CWL
-
BOS
1 stop26h 30m
Multiple Airlines
Deal found 24/3£653
Thu 2/423:30
BOS
-
CWL
1 stop26h 25m
Multiple Airlines
Wed 15/423:30
CWL
-
BOS
2 stops26h 35m
Multiple Airlines
Deal found 27/3£672
Sun 10/521:15
BOS
-
CWL
1 stop19h 30m
Multiple Airlines
Sun 17/517:40
CWL
-
BOS
2 stops30h 10m
Multiple Airlines
Deal found 26/3£684

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 29 March 2026.

Round-trip from

£562

One-way from

£423

Popular in

June

Cheapest in

February

Average price

£632
12/5-19/5
  • 12/5-19/5
  • 3 total stops
  • 52h 25m total
  • Boston to Cardiff
Search Deals
WestJet
  • WestJet
  • 16/8
  • 2 total stops
  • 47h 35m total
  • Boston to Cardiff
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£136 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£26 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
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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 29 March 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

Tue 12/5

20:50-09:15

3 stops31h 25m

Cardiff Wales

Tue 19/5

23:15-22:39

3 stops28h 24m

£722
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

09:45-16:35

1 stop11h 50m

£752

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 22/4

16:35-09:15

1 stop11h 40m

Cardiff Wales

Wed 13/5

17:15-13:16

1 stop25h 01m

£755

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 22/4

12:30-09:15

2 stops15h 45m

Cardiff Wales

Wed 13/5

09:45-16:25

1 stop11h 40m

£758

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 29/4

17:20-22:25

2 stops24h 05m

Cardiff Wales

Sat 2/5

07:30-22:39

2 stops20h 09m

£773

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 6/9

19:00-16:45

1 stop16h 45m

Cardiff Wales

Mon 14/9

09:45-18:30

1 stop13h 45m

£790
Cheapest one-way

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Fri 14/8

09:00-10:15

2 stops20h 15m

£437

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Mon 17/8

20:25-16:45

1 stop15h 20m

£570
Fastest single journey

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Sun 16/8

19:05-09:15

1 stop9h 10m

£570

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 20/8

19:05-09:15

1 stop9h 10m

£608

Flights are sorted by cheapest return flights first.

Deals found on 25/3

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, April is the cheapest month in which you can book a flight from Boston to Cardiff (average of £156). Flying from Boston to Cardiff in June is currently the most expensive (average of £798). 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.

  • How long is the flight from Boston to Cardiff?

    Delta and KLM can get you from Boston to Cardiff in just under 11h 35m. Your travel time can differ by up to 05m. Boston and Cardiff are separated by a distance of 3137 mi. This flight may include one or multiple stops.

  • 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, April is the cheapest month in which you can book a flight from Boston to Cardiff (average of £156). Flying from Boston to Cardiff in June is currently the most expensive (average of £798). 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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