Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

BOS - CWL

$377 Find cheap flights from Boston to Cardiff

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Cardiff departing on 8/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Fri 6/21
Fri 6/28

Search hundreds of travel sites at once for deals on flights to Cardiff

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Cardiff, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Cardiff, as well as popular online travel agencies
In the last 7 days travelers have searched 43,423,329 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Boston to Cardiff (BOS-CWL)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Cardiff that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
4:40 pm - 4:45 pmBOS-CWL
19h 05m1 stop
9:45 am - 4:35 pmCWL-BOS
11h 50m1 stop
$945KLM
Find Deal
Thu, Jun 6 - Wed, Jun 12
4:40 pm - 4:45 pmBOS-CWL
19h 05m1 stop
9:45 am - 6:40 pmCWL-BOS
13h 55m2 stops
$955KLM
Find Deal
Thu, Jun 6 - Wed, Jun 12
8:25 pm - 9:15 amBOS-CWL
31h 50m1 stop
9:45 am - 4:40 pmCWL-BOS
11h 55m1 stop
$1,105Delta
Find Deal
Sun, Jul 28 - Fri, Aug 16
9:10 am - 9:15 amBOS-CWL
19h 05m2 stops
9:45 am - 4:40 pmCWL-BOS
11h 55m1 stop
$1,109Delta
Find Deal
Sun, Jul 28 - Fri, Aug 16
8:25 pm - 4:45 pmBOS-CWL
15h 20m1 stop
5:15 pm - 4:40 pmCWL-BOS
28h 25m1 stop
$1,201Air France
Find Deal
Fri, Jul 19 - Thu, Jul 25
3:00 pm - 4:45 pmBOS-CWL
44h 45m2 stops
5:15 pm - 1:40 pmCWL-BOS
25h 25m1 stop
$1,218Air France
Find Deal
Thu, Jul 18 - Thu, Jul 25
6:10 am - 7:45 pmBOS-CWL
32h 35m3 stops
1:25 pm - 1:25 pmCWL-BOS
29h 00m2 stops
$1,317
Find Deal
Mon, Jun 17 - Wed, Jun 19
4:05 pm - 7:45 pmBOS-CWL
22h 40m2 stops
1:25 pm - 1:25 pmCWL-BOS
29h 00m2 stops
$1,347
Find Deal
Mon, Jun 17 - Wed, Jun 19
8:20 pm - 11:30 amBOS-CWL
34h 10m2 stops
12:00 pm - 11:55 amCWL-BOS
28h 55m2 stops
$1,546British Airways
Find Deal
Sun, Jun 16 - Wed, Jun 19
8:20 pm - 11:30 amBOS-CWL
34h 10m2 stops
1:10 pm - 11:55 amCWL-BOS
27h 45m2 stops
$1,782British Airways
Find Deal
Sun, Jun 16 - Sat, Jun 22

Flights from Boston to Cardiff - Travel Insights & Trends

Get data-powered insights and trends into flights from Boston to Cardiff to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boston to Cardiff?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Boston to Cardiff, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Boston to Cardiff is October, where tickets cost $698 on average. On the other hand, the most expensive months are December and June, where the average cost of tickets is $1,397 and $1,335 respectively.

Which airlines provide the cheapest flights from Boston to Cardiff?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from Boston to Cardiff found by KAYAK users in the last 72 hours was for $945 on KLM, followed by Delta ($1,105). One-way flight deals have also been found from as low as $597 on ITA Airways and from $598 on Delta.

Good to know

Low season

February

High season

September

Cheapest flight

$377
Best time to beat the crowds with an average 30% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Boston to Cardiff

When to book flights from Boston to Cardiff

Are your dates flexible? Find out the best times to travel from Boston to Cardiff based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boston to Cardiff

  • What is the cheapest flight from Boston to Cardiff?

    In the last 3 days, the lowest price for a flight from Boston to Cardiff was $377 for a one-way ticket and $945 for a round-trip.

  • Do I need a passport to fly between Boston and Cardiff?

    Yes, you’ll need a passport to travel to Cardiff from Boston.

  • Which airports will I be using when flying from Boston to Cardiff?

    Boston airport is called Boston Logan Intl and the only airport in Cardiff is Cardiff Wales.

  • Which aircraft models fly most regularly from Boston to Cardiff?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to Cardiff?

    SkyTeam, and oneworld are the airline alliances operating flights between Boston and Cardiff, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Boston to Cardiff, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from Boston to Cardiff are Delta and KLM. With an average price for the route of $921 and an overall rating of 8.0, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $1,008 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from Boston to Cardiff?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Cardiff.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Cardiff?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Cardiff from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Cardiff?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Cardiff with an airline and back to Boston with another airline. Booking your flights between Boston and CWL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Cardiff?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Cardiff from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from Boston to Cardiff

 
See real verified KAYAK customer reviews for airlines flying from Boston to Cardiff. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Cardiff? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10585 reviews
7.4Food
8.2Boarding
8.6Crew
7.9Comfort
8.0Entertainment
Airline reviews

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

6.0 GoodPeter, May 2024SLC - HNL
Read more about Delta reviews

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Half the bathrooms assigned to economy were out of action

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The 1st class male crew member was very pleasant - the short female with round glasses , maybe in 50’s had no personality- never spoke when delivering my food, drink, & never smiled the whole trip! In fact looked annoyed when the boarding proses was happening- I would never hire this woman - unfriendly . Have never dealt with a crew member like her-

Everything went smoothly. I didn’t like that when I booked in the main cabin my wife and I weren’t seated together. One would think when booking on an option that allows picking your seat. They would put you and your travel partner together. Had to call to get it sorted. They did fix.

The flight was again delayed for more then 2 hours with some lousy explanation regarding the reason of the delay. Although the flight was delayed for more than 2 hours, no refreshments were offered (according to EU regulations). Last 4 flights on KLM - always at least 2 hrs late. So be prepared that you cannot plan anything with KLM.

The flight was delayed for 2 hrs. Because they didn’t have a crew to fly. And it is not a first time for klm to do that. Last time they cancelled my filght and rebooked me 3 days later. Not reliable airline

Booked connecting flights with KlM. My serving flight was the furthest part of the airport. On arrival in Zurich. My two cases arrived but only one carry on belong to my son. His three suitcase didn't arrive. After enquiring we discovered they were still in Amsterdam. We landed at 11.12. We eventually left the airport just after one.

I thought KLM was the best airline but the Lima - Amsterdam was 1 hours late, the Brussels - Amsterdam was 2.30 hours late and the Amsterdam - Lima was 30 minutes late

no issues at all... Kudos to the food. This time was really really good

The food was ok. The crew seemed like they were cranky. I had one guy get mad at me for passing in between the storage area to get to the other toilet. I can understand if it's not allowed but reprimanding me like I'm a student saying "This is the last time!" was not appropriate. During my meal time, there was a French family around me. No problems there but when we usually have meals, they are supposed to put their chair in the upright position. These people did not do it and the steward did not tell them to raise their seat in the upright position. However, I was told to do so! So, me and another person next to me had to eat with the monitor almost touching our faces. Furthermore, a lady in front of me was putting her feet up and preventing another elder passenger from putting her seat back. To make it worse, she was continuously hitting her back into her seat, shaking my monitor while I was watching a movie. A crew member did speak to her about it but then she accused me of pushing her seat forward! The crew member gave me a death stare and told me to stop pushing the seat forward. I did not even touch her seat at all, if I did, she would know it. Her boyfriend also stood up and tried to push her seat even further past the maximum decline to no avail. None of these people were reprimanded but the steward, some bald guy, was extremely friendly with them and did not even try to instruct them to do anything until it was time to land. I resisted the urge to really argue with them because I would have obviously been seen as the aggressor (I have no idea why). I hardly said anything on this flight except "more wine please" and "sorry" if I bumped into someone accidentally. Overall, it was an annoying flight and I had to resist the urge to yell at the steward and the people he was overly friendly with. The happiest moment of this flight was leaving it.

Overall a good experience. We were disappointed when we had to check our carry on due to the plane being full. KLM hadn’t notified us and we had valuable items in the carry on but they still made us check it. Some of the food was great and some was mediocre. Crew is really kind and funny.

The worst airline. Cancelled flight 30 min before boarding and rebooked on flight after 3 days.

I travel frequently. The flight was late again... KLM should really try and be on time

The plane was clean and the staff was friendly. Food and drinks as expected on international flights. The entertainment system was old style, with a pullout controller, and selections not as extensive as on other flights.

Book cheap flights from Boston to Cardiff

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Boston to Cardiff found on KAYAK in the last 72 hours.
8/12Mon
3 stops
33h 40mBOS-CWL
$377
8/27Tue
2 stops
15h 20mBOS-CWL
$403
8/27Tue
3 stops
33h 40mBOS-CWL
$405
8/29Thu
3 stops
36h 25mBOS-CWL
$423
8/26Mon
2 stopsITA Airways
42h 40mBOS-CWL
$597
8/26Mon
1 stopDelta
11h 20mBOS-CWL
$598
8/26Mon
2 stopsDelta
14h 54mBOS-CWL
$603
8/28Wed
2 stopsITA Airways
18h 40mBOS-CWL
$720
8/28Wed
1 stopDelta
11h 20mBOS-CWL
$1,020
8/29Thu
1 stopDelta
9h 15mBOS-CWL
$1,070

Search by stops

Search by airline

Search by price

Boston - Cardiff Flights

Departure:

Boston (undefined)United States

Destination:

Cardiff (CWL)United Kingdom

Return flight deals:

Cardiff - Boston

Cabin classes:

Browse destinations: