How long is the flight from Boston to Cardiff?

KLM can get you from Boston to Cardiff in just under 9h 20m. Your travel time can differ by up to . Boston and Cardiff are separated by a distance of 3137 mi.

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.

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).

What is the cheapest time of day to fly from BOS to CWL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to Cardiff as you normally would.

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.

£458+ Cheap Flights from Boston to Cardiff

Cheap flight deals from Boston to Cardiff

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 24 August 2026.

Fri 6/1117:50 -

1 stop9h 00m

Sat 14/1108:15 -

1 stop15h 50m

Deal found 24/8£534

Sun 4/1023:00 -

2 stops17h 45m

Sun 11/1021:45 -

1 stop26h 05m

Deal found 21/8£565

Tue 6/1023:40 -

1 stop18h 45m

Tue 13/1016:15 -

2 stops33h 50m

Deal found 22/8£584

Thu 1/1017:25 -

1 stop8h 55m

Mon 5/1022:10 -

2 stops51h 55m

Deal found 21/8£602

Thu 8/1017:25 -

1 stop8h 55m

Thu 15/1020:50 -

2 stops27h 00m

Deal found 24/8£625

Find flight deals from Boston to Cardiff

Round-trip from	£534
One-way from	£458

6/11-14/11
2 total stops
24h 50m total
Boston to Cardiff

Search Deals

Delta
10/9
1 total stop
11h 35m total
Boston to Cardiff

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Tue 6/10

16:55-09:15

3 stops35h 20m

Cardiff Wales

Tue 13/10

23:15-16:05

2 stops21h 50m

£660

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Thu 24/9

10:50-22:20

2 stops30h 30m

Cardiff Wales

Sat 10/10

07:30-09:05

2 stops30h 35m

£746

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Sat 19/9

21:15-21:20

1 stop19h 05m

Cardiff Wales

Thu 1/10

22:50-14:55

1 stop21h 05m

£749

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Fri 4/9

07:00-10:15

1 stop22h 15m

Cardiff Wales

Thu 10/9

11:35-10:30

1 stop27h 55m

£824

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Mon 16/11

19:25-09:45

1 stop9h 20m

Cardiff Wales

Mon 23/11

17:30-14:13

1 stop25h 43m

£832

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Thu 4/2

13:10-09:50

2 stops15h 40m

Cardiff Wales

Wed 17/2

10:20-23:34

2 stops18h 14m

£865

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Mon 16/11

12:05-09:45

2 stops16h 40m

Cardiff Wales

Mon 23/11

10:20-01:13

2 stops19h 53m

£880

Fastest return journey

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Sun 6/9

19:00-09:15

1 stop9h 15m

Cardiff Wales

Mon 14/9

09:45-18:30

1 stop13h 45m

£906

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Thu 10/9

16:40-09:15

1 stop11h 35m

Cardiff Wales

Wed 16/9

09:45-16:35

1 stop11h 50m

£906

BostonCardiff

BOS Boston Logan Intl - CWL Cardiff Wales

BOSCWL

Boston Logan Intl

Sun 6/9

16:40-09:15

1 stop11h 35m

Cardiff Wales

Mon 14/9

09:45-18:30

1 stop13h 45m

£907

Flights are sorted by cheapest return flights first.

Deals found on 23/8

Showing 1-10 of 11 resultsSorted by cheapest first

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.

BOS-CWL

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.

Related info for your journey

How long is the flight from Boston to Cardiff?
KLM can get you from Boston to Cardiff in just under 9h 20m. 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.

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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?

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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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Cheap flights from Boston to Cardiff from £458

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Boston to Cardiff

Cheapest flights from Boston to CardiffExplore 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 24 August 2026.

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 24 August 2026.

Best flights from Boston to CardiffDiscover carefully curated flight deals from Boston to Cardiff that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 August 2026.

Discover carefully curated flight deals from Boston to Cardiff that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 August 2026.

Last-minute flights from Boston to CardiffDiscover last-minute flight deals from Boston to Cardiff. Data last updated 24 August 2026 and is based on user searches.

Discover last-minute flight deals from Boston to Cardiff. Data last updated 24 August 2026 and is based on user searches.

One-way flights from Boston to CardiffSearch for one-way flight options from Boston to Cardiff. Find affordable one-way fares based on user searches. Data last updated 24 August 2026.

Search for one-way flight options from Boston to Cardiff. Find affordable one-way fares based on user searches. Data last updated 24 August 2026.

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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.

Related info for your journey

How long is the flight from Boston to Cardiff?

Can I find deals for flights from Boston to Cardiff that include hotel bookings?

How can I find direct flights from Boston to Cardiff?

Can I find deals for business class flights from Boston to Cardiff?

Travelling to a place near Cardiff?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boston to Cardiff

See prices for flight routes from nearby airports that may be better suited for you.

Other flights to Cardiff

Explore flights to Cardiff departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 24 August 2026.

Complete your trip

Complete your trip to Cardiff by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to Wales

Book a non-stop flight to one of these other cities located in Wales.

Search flights from Boston to Cardiff by cabin class

Find flights from Boston to Cardiff, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Boston and Cardiff flights

Browse other Boston and Cardiff flight options. Last updated on 24 August 2026.

Other flights from Boston

Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on 24 August 2026.

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Can Cheapflights notify me if prices for flights from Boston to Cardiff become cheaper?

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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 24 August 2026.

Best flights from Boston to Cardiff
Discover carefully curated flight deals from Boston to Cardiff that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 August 2026.

Last-minute flights from Boston to Cardiff
Discover last-minute flight deals from Boston to Cardiff. Data last updated 24 August 2026 and is based on user searches.

One-way flights from Boston to Cardiff
Search for one-way flight options from Boston to Cardiff. Find affordable one-way fares based on user searches. Data last updated 24 August 2026.