$370 Cheap Flights from Boston (BOS) to Cardiff (CWL)

View $370 flight on Mon, May 4, 2026Opens in a new window

Popular airlines from Logan International Airport (BOS) to Cardiff International Airport (CWL)

Cheap Flights from Boston to Cardiff (BOS-CWL)

Prices were available within the past 7 days and start at $370 for one-way flights and $673 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 18 - Tue, Nov 25
BOS
Boston
CWL
Cardiff
$673 Roundtrip, found 3 hours ago
$673
Roundtrip
found 3 hours ago
Select Delta flight, departing Tue, Nov 18 from Boston to Cardiff, returning Tue, Nov 25, priced at $673 found 3 hours ago
Virgin Atlantic
Tue, Dec 9 - Tue, Dec 23
BOS
Boston
CWL
Cardiff
$678 Roundtrip, found 1 day ago
$678
Roundtrip
found 1 day ago
Select Virgin Atlantic flight, departing Tue, Dec 9 from Boston to Cardiff, returning Tue, Dec 23, priced at $678 found 1 day ago
Delta
Wed, Dec 3 - Wed, Dec 10
BOS
Boston
CWL
Cardiff
$679 Roundtrip, found 1 day ago
$679
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Dec 3 from Boston to Cardiff, returning Wed, Dec 10, priced at $679 found 1 day ago
Virgin Atlantic
Wed, Mar 18 - Wed, Mar 25
BOS
Boston
CWL
Cardiff
$681 Roundtrip, found 6 hours ago
$681
Roundtrip
found 6 hours ago
Select Virgin Atlantic flight, departing Wed, Mar 18 from Boston to Cardiff, returning Wed, Mar 25, priced at $681 found 6 hours ago
Delta
Mon, Nov 24 - Tue, Dec 16
BOS
Boston
CWL
Cardiff
$685 Roundtrip, found 2 days ago
$685
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Nov 24 from Boston to Cardiff, returning Tue, Dec 16, priced at $685 found 2 days ago
Delta
Tue, Mar 17 - Mon, Mar 30
BOS
Boston
CWL
Cardiff
$687 Roundtrip, found 2 days ago
$687
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Mar 17 from Boston to Cardiff, returning Mon, Mar 30, priced at $687 found 2 days ago
Virgin Atlantic
Tue, Dec 9 - Tue, Dec 23
BOS
Boston
CWL
Cardiff
$689 Roundtrip, found 1 day ago
$689
Roundtrip
found 1 day ago
Select Virgin Atlantic flight, departing Tue, Dec 9 from Boston to Cardiff, returning Tue, Dec 23, priced at $689 found 1 day ago
Delta
Wed, Nov 19 - Tue, Nov 25
BOS
Boston
CWL
Cardiff
$690 Roundtrip, found 3 days ago
$690
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Nov 19 from Boston to Cardiff, returning Tue, Nov 25, priced at $690 found 3 days ago
KLM
Mon, May 4 - Tue, May 12
BOS
Boston
CWL
Cardiff
$722 Roundtrip, found 2 hours ago
$722
Roundtrip
found 2 hours ago
Select KLM flight, departing Mon, May 4 from Boston to Cardiff, returning Tue, May 12, priced at $722 found 2 hours ago
Air France
Wed, May 13 - Mon, May 18
BOS
Boston
CWL
Cardiff
$727 Roundtrip, found 1 hour ago
$727
Roundtrip
found 1 hour ago
Select Air France flight, departing Wed, May 13 from Boston to Cardiff, returning Mon, May 18, priced at $727 found 1 hour ago

Find the cheapest month to fly from Boston (BOS) to Cardiff (CWL)

September is typically the cheapest month to fly

From $678 - $1,090 per traveler.

Alternative airports near Cardiff

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Cardiff Intl. CWL. Cheapest and Closest option available. Average driving time to city center is 20 minutes. Flights from $995
CWL
Cardiff Intl.
CheapestClosest
Average driving time to city center20 min
Flights from $995
Flights from Boston (BOS) to Cardiff (CWL)
Origin airport
Logan Intl.
Destination airport
Cardiff Intl.
Airlines serving
Air France, Delta, KLM, Virgin Atlantic
Roundtrip price
$673
Distance
3139 mi

Boston to Cardiff Flights

The cheapest times to fly from Boston to Cardiff

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to Cardiff are during the month of November. You can find some of the cheapest flights from Boston to Cardiff with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boston to Cardiff

Sunday is one of the best days to book for cheap flights from Boston to Cardiff: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boston to Cardiff

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to Cardiff in 2025. You can also book with separate airlines for your outbound and return journeys, from $370 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to Cardiff flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to Cardiff airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL) cost?
Lock in a cheap one-way flight from $370 or cheap return flight from $673 from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL)?
Planning your trip for November is a good way to save, as it's the cheapest month for flights between BOS and CWL. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest BOS to CWL flight.
How many flights per day from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL)?
You'll have to book a flight with a layover when traveling from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from BOS to CWL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary depending on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL)?
To avoid possible delays on the Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL) route, travel before 3 PM. Later departures are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL) last-minute?
Last-minute fares from BOS to CWL are generally more expensive. To secure the lowest prices, start looking for flights well in advance. That said, if your travel plans are flexible, it's possible to score a cheap fare right before your journey.
Is it cheaper to book a BOS to CWL flight and hotel package?
Opting for a BOS to CWL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Pick from our extensive range of accommodations and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Cardiff Intl. Airport (CWL)?
Typically, you can cancel or modify your BOS to CWL flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you want more information, go to our Customer Service portal.

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*Available to One Key members.