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Cardiff

$793+ Cheap flights from Boston (BOS) to Cardiff (CWL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — CWL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$763
(Kiwi.com)

Popular in

November

Cheapest in

February

Average price

$977
From Boston Logan Intl to Cardiff Wales
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($79 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($60 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This KLM deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:10 pmBOS - CWL
1 stop9h 40mKLM
Mon 12/15:15 pmCWL - BOS
1 stop25h 05mKLM
Deal found 9/9$793
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/128:15 pmBOS - CWL
1 stop15h 50mDelta
Thu 9/259:50 amCWL - BOS
1 stop11h 40mDelta
Deal found 9/9$808
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:10 pmBOS - CWL
1 stop16h 45mDelta
Sat 11/110:20 amCWL - BOS
2 stops16h 07mDelta
Deal found 9/10$855
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2712:10 pmBOS - CWL
2 stops16h 40mDelta
Mon 12/110:20 amCWL - BOS
2 stops13h 36mDelta
Deal found 9/9$1,092

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated September 11, 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 11/27

7:10 pm-9:50 am

1 stop9h 40m

Cardiff Wales

Mon 12/1

5:15 pm-1:20 pm

1 stop25h 05m

$793

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Wed 10/29

8:10 pm-4:55 pm

1 stop16h 45m

Cardiff Wales

Sat 11/1

10:20 am-10:27 pm

2 stops16h 07m

$855

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 11/27

12:10 pm-9:50 am

2 stops16h 40m

Cardiff Wales

Mon 12/1

10:20 am-6:56 pm

2 stops13h 36m

$1,092

BostonCardiff

BOS - CWL

BOSCWL

Boston Logan Intl

Thu 11/27

9:35 pm-11:30 am

3 stops32h 55m

Cardiff Wales

Mon 12/1

12:00 pm-9:39 am

3 stops26h 39m

$3,185

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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 round-trip 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 $773). Flying from Boston to Cardiff in June is currently the most expensive (average of $1,622). 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.

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

Find hourly flight availability from Boston to Cardiff. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Boston to Cardiff at noon. If you’re flexible enough to do this you can expect to save up to 5% on your trip compared to booking a flight in the morning.

How much does it cost to fly round-trip from Boston to Cardiff?

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 September 11, 2025.
See what other customers who have flown with Delta and KLM from Boston to Cardiff have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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
1,385 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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.

  • How long is the flight from Boston to Cardiff?

    A quick flight from Boston to Cardiff can take about 9h 40m. KLM provides one of the quickest options available for as low as $793. The distance from Boston to Cardiff is about 3137 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Boston to Cardiff round-trip?

    Our cheapest airline available from Boston to Cardiff is KLM. Our recent data shows that you can find tickets from as low as $766 on this airline. An additional option worth looking into is Delta, starting at $793. You may be able to fly from Boston to Cardiff for 26% less than the average price by searching for these airlines.

  • 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 vacation 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 $773). Flying from Boston to Cardiff in June is currently the most expensive (average of $1,622). 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

Traveling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Barry

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Top 2 airlines flying from Boston to Cardiff

Discover the top 2 airlines that operate flights from Boston to Cardiff. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$766Average$977FlexibilityNo cancel feeOn-time75%
DeltaCheapest$793Average$999FlexibilityNo cancel feeOn-timeN/A

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