BOS - CWL

$354 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 12/6. 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
$533
Multiple Airlines
Thu 12/4Mon 12/8
BOS - CWL • 2 stops
Cheapest one-way
$354
Multiple Airlines
Sat 12/6
BOS - CWL • 2 stops
Top airlines
Virgin Atlantic
Cheapest • from $734 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
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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

Thu, Dec 4 - Mon, Dec 8
Multiple Airlines Logo
7:50 pm - 10:00 pmBOS-CWL
21h 10m2 stops
Multiple Airlines Logo
11:30 pm - 5:50 pmCWL-BOS
23h 20m2 stops
$533Multiple Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
Multiple Airlines Logo
7:10 pm - 4:45 pmBOS-CWL
16h 35m1 stop
Multiple Airlines Logo
10:20 am - 1:20 pmCWL-BOS
32h 00m1 stop
$730Multiple Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
Virgin Atlantic Logo
1:10 pm - 9:50 amBOS-CWL
15h 40m2 stops
Virgin Atlantic Logo
5:15 pm - 1:20 pmCWL-BOS
25h 05m1 stop
$734Virgin Atlantic
Find Deal
Fri, Nov 28 - Tue, Jan 27
Delta Logo
7:10 pm - 4:55 pmBOS-CWL
16h 45m1 stop
Delta Logo
10:20 am - 10:33 pmCWL-BOS
17h 13m2 stops
$740Delta
Find Deal
Thu, Jan 15 - Mon, Jan 19
KLM Logo
1:10 pm - 9:50 amBOS-CWL
15h 40m2 stops
KLM Logo
5:15 pm - 1:30 pmCWL-BOS
25h 15m1 stop
$742KLM
Find Deal
Thu, Dec 4 - Mon, Dec 8
Virgin Atlantic Logo
7:10 pm - 4:45 pmBOS-CWL
16h 35m1 stop
Virgin Atlantic Logo
5:15 pm - 1:20 pmCWL-BOS
25h 05m1 stop
$743Virgin Atlantic
Find Deal
Thu, Jan 15 - Mon, Jan 19
Virgin Atlantic Logo
12:55 pm - 9:50 amBOS-CWL
15h 55m2 stops
Virgin Atlantic Logo
5:15 pm - 3:18 pmCWL-BOS
27h 03m2 stops
$752Virgin Atlantic
Find Deal
Sun, Mar 22 - Sat, Mar 28
KLM Logo
9:50 pm - 9:50 amBOS-CWL
32h 00m1 stop
KLM Logo
5:25 pm - 4:30 pmCWL-BOS
27h 05m1 stop
$753KLM
Find Deal
Fri, Nov 7 - Tue, Nov 11
Delta Logo
12:55 pm - 9:50 amBOS-CWL
15h 55m2 stops
Delta Logo
10:20 am - 11:55 pmCWL-BOS
18h 35m2 stops
$758Delta
Find Deal
Thu, Jan 15 - Mon, Jan 19
Aer Lingus Logo
9:15 pm - 11:30 amBOS-CWL
33h 15m3 stops
Aer Lingus Logo
12:00 pm - 6:59 pmCWL-BOS
35h 59m3 stops
$1,191Aer Lingus
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 Virgin Atlantic ($734) and Delta ($740).

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$354
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 2% 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 $354 for a one-way ticket and $533 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 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 $992 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 7981 reviews
7.9Comfort
7.9Entertainment
7.3Food
8.5Crew
8.2Boarding
Airline reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

6.0 GoodDavid, Oct 2025JFK - KEF
Read more Delta reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

The boarding process needs to be refined. Sometimes the gate crew call out the boarding zone, and then flip to the monitor to show which zones are boarding. So unless everyone is gathered around to see the monitor there is usually confusion as wi which zones are boarding.

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

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