BOS - CWL

$831 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 7/2. 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
$671
Overall average: $783
KLM
Sun 3/29Fri 4/10
BOS - CWL • 1 stop
Cheapest one-way
$525
Multiple Airlines
Thu 7/2
BOS - CWL • 1 stop
Top airlines
KLM
Cheapest • from $671 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 21% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Cardiff!
Flight Deals
Booking Insights
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

Sun, Mar 29 - Fri, Apr 10
KLM Logo
4:35 pm - 4:45 pm
BOS
-
CWL
19h 10m
1 stop
KLM Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$671KLM
Tue, Apr 7 - Tue, Apr 14
Delta Logo
11:30 am - 9:15 am
BOS
-
CWL
16h 45m
2 stops
Delta Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$675Delta
Sun, Mar 29 - Fri, Apr 10
KLM Logo
1:55 pm - 9:15 am
BOS
-
CWL
14h 20m
2 stops
KLM Logo
9:45 am - 6:30 pm
CWL
-
BOS
13h 45m
1 stop
$676KLM
Tue, Apr 7 - Tue, Apr 14
Delta Logo
11:30 am - 9:15 am
BOS
-
CWL
16h 45m
2 stops
Delta Logo
9:45 am - 10:59 pm
CWL
-
BOS
18h 14m
2 stops
$686Delta
Sun, Apr 19 - Sun, May 3
KLM Logo
8:25 pm - 9:15 am
BOS
-
CWL
31h 50m
1 stop
KLM Logo
9:50 am - 6:30 pm
CWL
-
BOS
13h 40m
1 stop
$721KLM
Sun, Apr 19 - Sun, May 3
Scandinavian Airlines Logo
8:25 pm - 9:15 am
BOS
-
CWL
31h 50m
1 stop
Scandinavian Airlines Logo
9:50 am - 10:59 pm
CWL
-
BOS
18h 09m
2 stops
$752Scandinavian Airlines
Sun, Mar 29 - Fri, Apr 10
Delta Logo
1:55 pm - 9:15 am
BOS
-
CWL
14h 20m
2 stops
Delta Logo
9:45 am - 11:49 pm
CWL
-
BOS
19h 04m
2 stops
$761Delta
Thu, Apr 16 - Thu, Apr 23
Multiple Airlines Logo
12:35 pm - 9:15 am
BOS
-
CWL
15h 40m
2 stops
Multiple Airlines Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$831Multiple Airlines
Tue, Apr 7 - Tue, Apr 14
Delta Logo
4:35 pm - 9:15 am
BOS
-
CWL
11h 40m
1 stop
Delta Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$836Delta
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
8:50 pm - 11:25 pm
BOS
-
CWL
21h 35m
2 stops
Multiple Airlines Logo
11:15 pm - 7:55 pm
CWL
-
BOS
25h 40m
3 stops
$929Multiple Airlines
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.

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 round-trip 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 January, where tickets cost $735 (return) on average. On the other hand, the most expensive months are June and April, where the average cost of round-trip tickets is $1,419 and $1,041 respectively.

Good to know

Low seasonJune
Cheapest flight$525
Best time to beat the crowds but there is an average 51% increase in price.
Most popular time to fly with an average 6% 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 $525 for a one-way ticket and $671 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 $977 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 $828 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 8058 reviews
8.1Boarding
7.9Comfort
8.5Crew
7.8Entertainment
7.2Food
Airline reviews

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

8.0 ExcellentTracy, Jan 2026
ATL - SEA
Read more Delta reviews

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

Departure was delayed resulting in me missing my connection. Delta did not autimatically find me another flight.

The seats weren’t reclining even though it wasn’t as exit seat

It was good because we traveled without luggage, carry on only.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

The entertainment screens were not working and there was no air condition the entire flight. Very uncomfortable.

I have diamond medallion status and usually we are in comfort plus . We were in main this time ( which was fine ) and my husband wanted wine . I have at least 10 vouchers for drinks that are good for this year and next! The attendant would not take the picture of the voucher as proof and never came back to check as She asked me to pull it up on delta Wi-Fi. Instead my husband just used his Amex to buy the wine . Disappointing!!!

Food is basically Sun Chips, cookies or Cheezits. I had an exit row seat so I had plenty of room. The crew was very nice and efficient. Pilot kept us informed. Pretty good flight.

Air travel sucks. It continues to be awful for all airlines. No shame on delta alone.

It was Delta, but the flight attendants were stressful and disrespectful. I am a diamond member a travel weekly. I have not had a negative thing to share in quite some time. But this was noticeable.

Flight was on time, staff are friendly and helpful onboard.

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

Delay and had to run between flight to get my connection due to this delay but besides that the overall experience was ok. I arrived with just an hour of delay.

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!

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

Information on your arrival and departure airports