BOS - CWL

$236 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 11/11. 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

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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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

Mon, Oct 13 - Mon, Oct 20
 Logo
9:25 pm - 3:55 pmBOS-CWL
13h 30m1 stop
 Logo
12:55 pm - 8:05 pmCWL-BOS
36h 10m2 stops
Mon, Oct 13 - Mon, Oct 20
 Logo
8:50 pm - 3:55 pmBOS-CWL
14h 05m2 stops
 Logo
1:10 pm - 8:05 pmCWL-BOS
35h 55m2 stops
Mon, Oct 13 - Mon, Oct 20
 Logo
6:00 am - 3:55 pmBOS-CWL
28h 55m3 stops
 Logo
1:10 pm - 8:05 pmCWL-BOS
35h 55m2 stops
Mon, Oct 13 - Mon, Oct 20
KLM Logo
4:50 pm - 4:45 pmBOS-CWL
18h 55m1 stop
KLM Logo
5:15 pm - 6:20 pmCWL-BOS
30h 05m1 stop
$810KLM
Find Deal
Tue, Feb 10 - Wed, Feb 18
Delta Logo
7:10 pm - 9:50 amBOS-CWL
9h 40m1 stop
Delta Logo
10:20 am - 6:55 pmCWL-BOS
13h 35m1 stop
$818Delta
Find Deal
Tue, Feb 10 - Wed, Feb 18
Delta Logo
12:55 pm - 9:50 amBOS-CWL
15h 55m2 stops
Delta Logo
10:20 am - 6:55 pmCWL-BOS
13h 35m1 stop
$823Delta
Find Deal
Thu, Nov 27 - Mon, Dec 1
KLM Logo
7:10 pm - 9:50 amBOS-CWL
9h 40m1 stop
KLM Logo
5:15 pm - 1:20 pmCWL-BOS
25h 05m1 stop
$830KLM
Find Deal
Tue, Feb 10 - Wed, Feb 18
Delta Logo
1:10 pm - 9:50 amBOS-CWL
15h 40m2 stops
Delta Logo
10:20 am - 10:33 pmCWL-BOS
17h 13m2 stops
$833Delta
Find Deal
Wed, Dec 17 - Thu, Jan 22
Virgin Atlantic Logo
9:55 am - 9:50 amBOS-CWL
18h 55m2 stops
Virgin Atlantic Logo
5:25 pm - 1:25 pmCWL-BOS
25h 00m1 stop
$1,035Virgin Atlantic
Find Deal
Wed, Dec 17 - Thu, Jan 22
Virgin Atlantic Logo
9:55 am - 9:50 amBOS-CWL
18h 55m2 stops
Virgin Atlantic Logo
10:20 am - 7:24 amCWL-BOS
26h 04m2 stops
$1,045Virgin Atlantic
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 KLM ($810) and Delta ($818).

Good to know

Low seasonFebruary
Cheapest flight$236
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly and prices are also 10% 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 $236 for a one-way ticket and $614 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 $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 7.8.

  • 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.

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 7979 reviews
7.9Comfort
8.2Boarding
7.3Food
8.5Crew
7.9Entertainment
Airline reviews

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

4.0 Okaypuravi, Aug 2025LGA - STL
Read more Delta reviews

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Nothing special. The crew never went out of their way for anything.

Three seats in first class were broken and while they were able to still acommodate us it was looking very touch and go and they had others they could not acommodate

Mechanic delay in addition to a 2 hour change in takeoff time was frustrating.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

The flight attendants in SLC were rude. I arrived 40 minutes early to gate. Ticket said I needed check in for seat assignments and tried check in and attendants said they weren’t doing it. And proceeded to never call me to give me a ticket so when time to board I received the very last seat. Please relay to employees to do their job better..,

On this flight I felt the food offering was not as complete as on previous flights. The tomato salad was a bit off and there was nothing additional such a bread or butter. The breakfast was only one option, so you either ate what they had or ate nothing. The crew was efficient, but most seemed frustrated throughout the flight. The flight arrived early and was obstacle-free, so I’m overall quite happy, but the shine in the rest of the experience just wasn’t there.

The seats got pretty uncomfortable pretty fast. The armrests are bigger than on other planes, so I had less room in the actual seat. My butt hurt by the end of the flight. :/ comfort was the primary issue. The crew were fantastic!

I believe that a four-hour trip should have a meal. Delta had none.

Great flight with Delta! Boarding was quick and easy, the amenities were solid, and the plane was in great shape. The flight attendants had a fun, lively energy while staying professional. All in all, a smooth trip — even managed to catch up on some rest. Thanks, Delta!

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.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

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!

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

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

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