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$682+ Cheap flights from Cardiff (CWL) to Boston (BOS)

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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — BOS
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
1 adult, Economy
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Cheap flight deals from Cardiff to Boston

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Boston (BOS). 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 July 2, 2025.

Round-trip from

$682
(KLM)

Popular in

August

Cheapest in

June

Average price

$1,120
From Cardiff Wales to Boston Logan Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($172 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
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Find flight deals from Cardiff to Boston

Cheapest flights from Cardiff to Boston
Explore the most affordable flight options available from Cardiff to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 2, 2025.

This KLM deal was found by Cheapflights users on 7/1. 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.
Sat 9/205:35 pmCWL - BOS
1 stop29h 50mKLM
Wed 10/2910:05 pmBOS - CWL
1 stop31h 45mKLM
Deal found 7/1$682
This Delta deal was found by Cheapflights users on 7/1. 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.
Sat 9/209:45 amCWL - BOS
2 stops17h 45mDelta
Wed 10/293:34 pmBOS - CWL
2 stops14h 16mDelta
Deal found 7/1$687
This Kiwi.com deal was found by Cheapflights users on 7/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/169:00 amCWL - BOS
1 stop10h 40mMultiple Airlines
Sat 8/235:30 pmBOS - CWL
1 stop12h 05mMultiple Airlines
Deal found 7/2$1,098

Cheapflights Fare Finder

Customize your flight search to find flights from Cardiff to Boston 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 July 2, 2025.
Use the filters below to find and compare flights from Cardiff to Boston that are best for you.

Fly from

Cardiff

Fly to

Boston

Route

Depart

Return

Price

CardiffBoston

CWL - BOS

CWLBOS

Cardiff Wales

Sat 9/20

5:35 pm-6:25 pm

1 stop29h 50m

Boston Logan Intl

Wed 10/29

10:05 pm-9:50 am

1 stop31h 45m

$682

CardiffBoston

CWL - BOS

CWLBOS

Cardiff Wales

Sat 9/20

9:45 am-10:30 pm

2 stops17h 45m

Boston Logan Intl

Wed 10/29

3:34 pm-9:50 am

2 stops14h 16m

$687

CardiffBoston

CWL - BOS

CWLBOS

Cardiff Wales

Sat 8/16

9:00 am-2:40 pm

1 stop10h 40m

Boston Logan Intl

Sat 8/23

5:30 pm-10:35 am

1 stop12h 05m

$1,098

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Best time to book a flight from Cardiff to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from Cardiff 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 Cardiff to Boston

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

Currently, January is the cheapest month in which you can book a flight from Cardiff to Boston (average of $218). Flying from Cardiff to Boston in June is currently the most expensive (average of $306). 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.

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated July 2, 2025.
Get a feel of what it's like to fly with Delta and KLM from Cardiff to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

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
7,983 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

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
1,366 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

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 Cardiff to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Cheapflights users have booked flights from Cardiff to Boston round-trip from $682. Another airline that can offer you cheap pricing is Delta. KLM is priced at 12% lower than the current average price of a flight leaving 3 months from now.

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

    Yes. In addition to deals on Cardiff to Boston flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Boston.

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

    Yes. Cheapflights offers flight deals from Cardiff to Boston 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 Cardiff to Boston?

    Currently, January is the cheapest month in which you can book a flight from Cardiff to Boston (average of $218). Flying from Cardiff to Boston in June is currently the most expensive (average of $306). 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
Cambridge
Medford
Watertown
Warwick
Seabrook
Waltham
Framingham
Cranston
Randolph
Chestnut Hill
Chelsea
Brockton
York Beach
Saco
Burlington
West Yarmouth
Smithfield
Swansea
Lincoln
Quincy

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