How long is the flight from Boston to Cardiff?

KLM can get you from Boston to Cardiff in just under 18h 55m. 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 month to fly from Boston to Cardiff?

Flights from Boston to Cardiff lean towards being more expensive in November. Prices are generally better when you fly from Boston to Cardiff in February, with the cheapest ticket starting at £571.

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.

£351+ Cheap Flights from Boston to Cardiff

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

Airfare is below average for this route at the moment. Boston to Cardiff flights typically cost between £665 and £769 in October. The cheapest return flight price found within the last 3 days was £351 on Multiple Airlines (27 Oct-3 Nov).

Cheap flight deals from Boston to Cardiff

Round-trip from	£351
Popular in	November
Cheapest in	February
Average price	£721

27/10-3/11
4 total stops
43h 50m total
Boston to Cardiff

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£43 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 September 2025

Search Deals

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 12 9月 2025.

週一 27/1020:50BOS - CWL

2 stops20h 30mMultiple Airlines

週一 3/1123:30CWL - BOS

2 stops23h 20mMultiple Airlines

Deal found 11/9£351

週五 26/920:30BOS - CWL

2 stops33h 05mMultiple Airlines

週五 3/1012:25CWL - BOS

1 stop11h 20mMultiple Airlines

Deal found 11/9£563

週一 22/921:25BOS - CWL

1 stop13h 30mMultiple Airlines

週五 3/1012:25CWL - BOS

1 stop11h 20mMultiple Airlines

Deal found 11/9£579

週四 27/1119:10BOS - CWL

1 stop16h 35mKLM

週一 1/1217:15CWL - BOS

1 stop25h 05mKLM

Deal found 10/9£585

週一 22/921:25BOS - CWL

1 stop13h 30mMultiple Airlines

週四 2/1007:55CWL - BOS

1 stop11h 45mMultiple Airlines

Deal found 11/9£593

週一 22/917:19BOS - CWL

2 stops17h 36mMultiple Airlines

週一 6/1013:10CWL - BOS

1 stop10h 35mMultiple Airlines

Deal found 11/9£597

週二 23/918:45BOS - CWL

1 stop9h 30mDelta

週四 2/1009:50CWL - BOS

1 stop11h 40mDelta

Deal found 11/9£597

週一 22/913:00BOS - CWL

2 stops15h 15mDelta

週日 5/1009:50CWL - BOS

1 stop13h 30mDelta

Deal found 11/9£600

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 12 9月 2025.

週一 27/1020:50BOS - CWL

2 stops20h 30mMultiple Airlines

週一 3/1123:30CWL - BOS

2 stops23h 20mMultiple Airlines

Deal found 11/9£351

週一 29/916:50BOS - CWL

1 stop18h 55mKLM

週三 1/1009:50CWL - BOS

2 stops14h 52mKLM

Deal found 11/9£563

週二 23/918:45BOS - CWL

1 stop9h 30mDelta

週四 2/1009:50CWL - BOS

1 stop11h 40mDelta

Deal found 11/9£597

週四 27/1119:10BOS - CWL

1 stop16h 35mKLM

週一 1/1217:15CWL - BOS

1 stop25h 05mKLM

Deal found 10/9£585

週五 26/916:50BOS - CWL

1 stop11h 20mDelta

週四 2/1009:50CWL - BOS

1 stop11h 40mDelta

Deal found 11/9£597

週四 25/918:45BOS - CWL

1 stop9h 30mMultiple Airlines

週五 3/1009:50CWL - BOS

1 stop13h 30mMultiple Airlines

Deal found 11/9£597

週五 26/920:15BOS - CWL

1 stop32h 00mDelta

週五 3/1009:50CWL - BOS

1 stop13h 30mDelta

Deal found 11/9£597

Last-minute flights from Boston to Cardiff
Discover last-minute flight deals from Boston to Cardiff. Data last updated 12 9月 2025 and is based on user searches.

週一 22/921:25BOS - CWL

1 stop13h 30mMultiple Airlines

週五 3/1012:25CWL - BOS

1 stop11h 20mMultiple Airlines

Deal found 11/9£579

週一 22/921:25BOS - CWL

1 stop13h 30mMultiple Airlines

週四 2/1007:55CWL - BOS

1 stop11h 45mMultiple Airlines

Deal found 11/9£593

週一 22/917:19BOS - CWL

2 stops17h 36mMultiple Airlines

週一 6/1013:10CWL - BOS

1 stop10h 35mMultiple Airlines

Deal found 11/9£597

週一 22/913:00BOS - CWL

2 stops15h 15mDelta

週日 5/1009:50CWL - BOS

1 stop13h 30mDelta

Deal found 11/9£600

週二 23/918:45BOS - CWL

1 stop9h 30mDelta

週四 2/1009:50CWL - BOS

1 stop11h 40mDelta

Deal found 11/9£597

週二 23/911:55BOS - CWL

2 stops16h 20mDelta

週五 3/1009:50CWL - BOS

2 stops19h 09mDelta

Deal found 11/9£608

週五 26/920:30BOS - CWL

2 stops33h 05mMultiple Airlines

週五 3/1012:25CWL - BOS

1 stop11h 20mMultiple Airlines

Deal found 11/9£563

週一 27/1020:50BOS - CWL

2 stops20h 30mMultiple Airlines

週一 3/1123:30CWL - BOS

2 stops23h 20mMultiple Airlines

Deal found 11/9£351

Fly from

Fly to

Route

Depart

Return

Price

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週一 27/10

20:50-21:20

2 stops20h 30m

Cardiff Wales

週一 3/11

23:30-17:50

2 stops23h 20m

£351

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週一 29/9

16:50-16:45

1 stop18h 55m

Cardiff Wales

週三 1/10

09:50-19:42

2 stops14h 52m

£563

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週四 27/11

19:10-16:45

1 stop16h 35m

Cardiff Wales

週一 1/12

17:15-13:20

1 stop25h 05m

£585

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週二 23/9

18:45-09:15

1 stop9h 30m

Cardiff Wales

週四 2/10

09:50-16:30

1 stop11h 40m

£597

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週五 26/9

16:50-09:10

1 stop11h 20m

Cardiff Wales

週四 2/10

09:50-16:30

1 stop11h 40m

£597

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週四 25/9

18:45-09:15

1 stop9h 30m

Cardiff Wales

週五 3/10

09:50-18:20

1 stop13h 30m

£597

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

週五 26/9

20:15-09:15

1 stop32h 00m

Cardiff Wales

週五 3/10

09:50-18:20

1 stop13h 30m

£597

Flights are sorted by cheapest return flights first.

Deals found on 11/9

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.

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

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 18h 55m. 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.
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

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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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Cheap flights from Boston to Cardiff from £351

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Boston to Cardiff

Round-trip from

Popular in

Cheapest in

Average price

Find 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 12 9月 2025.

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 9月 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Cardiff that are best for you.

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.

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?

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?

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?

What is the cheapest month to book a flight from Boston to Cardiff?

Travelling to a place near Cardiff?

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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.

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How does Cheapflights help users find flights from Boston to Cardiff?

Why should you use Cheapflights to find cheap flight tickets from Boston to Cardiff?

Can Cheapflights find flights from Boston to Cardiff with no change fees?

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 12 9月 2025.