BOS - CWL

$604 Find Cheap Flights from Boston to Cardiff

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Cardiff departing on 12/31. 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
1 adult, Economy, 0 bags

KAYAK searches 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
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Everything you should know

Cheapest round-trip
$604
Multiple Airlines
Wed 12/31Thu 1/8
BOS - CWL • 1 stop
Cheapest one-way
Multiple Airlines
Fri 11/14
BOS - CWL • multi-stop
Top airlines
Delta
Cheapest • from $710 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Cardiff!
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Flight Deals

Cheap Flights 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to Cardiff

Wed, Dec 31 - Thu, Jan 8
Multiple Airlines Logo
5:20 pm - 10:05 amBOS-CWL
11h 45m1 stop
Multiple Airlines Logo
10:30 am - 6:59 pmCWL-BOS
13h 29m1 stop
$604Multiple Airlines
Find Deal
Sat, Feb 28 - Fri, Mar 6
Multiple Airlines Logo
9:15 pm - 8:55 pmBOS-CWL
18h 40m1 stop
Multiple Airlines Logo
12:20 pm - 6:59 pmCWL-BOS
11h 39m1 stop
$653Multiple Airlines
Find Deal
Sat, Feb 28 - Fri, Mar 6
Multiple Airlines Logo
7:50 pm - 8:55 pmBOS-CWL
20h 05m2 stops
Multiple Airlines Logo
10:25 pm - 5:50 pmCWL-BOS
24h 25m2 stops
$697Multiple Airlines
Find Deal
Wed, Dec 31 - Tue, Jan 6
Multiple Airlines Logo
8:50 pm - 4:55 pmBOS-CWL
15h 05m1 stop
Multiple Airlines Logo
10:20 am - 1:30 pmCWL-BOS
32h 10m1 stop
$700Multiple Airlines
Find Deal
Wed, Dec 31 - Thu, Jan 8
Delta Logo
8:50 pm - 9:50 amBOS-CWL
32h 00m1 stop
Delta Logo
10:20 am - 10:22 pmCWL-BOS
17h 02m2 stops
$710Delta
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Tue, Dec 30 - Thu, Jan 8
Delta Logo
5:30 am - 9:50 amBOS-CWL
23h 20m2 stops
Delta Logo
10:20 am - 10:22 pmCWL-BOS
17h 02m2 stops
$715Delta
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Sun, Nov 30 - Sun, Dec 7
Delta Logo
7:10 pm - 9:50 amBOS-CWL
9h 40m1 stop
Delta Logo
10:20 am - 6:55 pmCWL-BOS
13h 35m1 stop
$725Delta
Find Deal
Thu, Jan 1 - Tue, Jan 6
Multiple Airlines Logo
7:05 pm - 9:50 amBOS-CWL
9h 45m1 stop
Multiple Airlines Logo
10:20 am - 1:30 pmCWL-BOS
32h 10m1 stop
$758Multiple Airlines
Find Deal
Thu, Jan 1 - Wed, Jan 7
Delta Logo
7:05 pm - 9:50 amBOS-CWL
9h 45m1 stop
Delta Logo
10:20 am - 9:30 pmCWL-BOS
40h 10m2 stops
$768Delta
Find Deal
Tue, Feb 10 - Sat, Feb 14
Multiple Airlines Logo
9:15 pm - 3:30 pmBOS-CWL
13h 15m1 stop
Multiple Airlines Logo
8:05 pm - 2:35 pmCWL-BOS
23h 30m2 stops
$784Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Boston to Cardiff flights

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.

Which airlines provide the cheapest flights from Boston to Cardiff?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Boston to Cardiff were found on Delta ($710) and KLM ($812).

Which airlines fly non-stop between Boston and Cardiff?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Boston to Cardiff.

There are 2 airlines that fly nonstop from Boston to Cardiff. They are Delta and KLM. The cheapest airline for this route is KLM, with the best round-trip deal found costing $766. On average, the best prices for this route can be found at KLM.

Good to know

Low seasonFebruary
Cheapest flight$604
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 3% increase in price.
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 $604 for a round-trip ticket.

  • 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 is the only airline alliance operating flights between Boston and Cardiff.

  • 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 $999 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $977 and an overall rating of 7.7.

  • 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.

Reviews of the 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.
7.9
DeltaOverall score based on 8007 reviews
7.9Entertainment
8.5Crew
7.9Comfort
7.3Food
8.1Boarding
Airline reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

10.0 ExcellentJacky, Nov 2025JFK - LHR
Read more Delta reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

The ticket agents in West Palm Beach on Friday afternoon Nov. 7th were incredible in getting us on an earlier plane to Atlanta during the government shutdown. Had the taken our original flight we would have missed our connection. She did this on her own, We didn't even have to ask, and she did it all with a smile and showing genuine concern that we would be taken care of. We are very grateful and thankful. We fly often, and now we will be sure to fly Delta.

Flight delayed then cancelled. Misplaced luggage. Still do not have. Rented car 1100 mile drive. I had to buy some overnight Hotels clothes toiletries gas food at my expense. Still not home. Not sure where luggage is. Over 4 hours on hold to Felta

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Everything you need to know for your flight from Boston to Cardiff

Information on your arrival and departure airports