BOS - CWL

$480 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 4/21. 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
$524
Overall average: $964
Multiple Airlines
Sat 4/4Sat 4/11
BOS - CWL • 2 stops
Cheapest one-way
$480
Delta
Tue 4/21
BOS - CWL • 1 stop
Top airlines
Delta
Cheapest • from $793 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Boston and Cardiff. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Dublin (DUB)
Cheapest • Avg $566 (round-trip)
Dublin (DUB)
Shortest trip • 9h 25m (one-way)
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 26% price drop
April
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

Sat, Apr 4 - Sat, Apr 11
Multiple Airlines Logo
8:50 pm - 9:20 pm
BOS
-
CWL
19h 30m
2 stops
Multiple Airlines Logo
7:30 am - 9:45 pm
CWL
-
BOS
19h 15m
2 stops
$524Multiple Airlines
Sat, May 2 - Sat, May 9
Multiple Airlines Logo
8:50 pm - 9:20 pm
BOS
-
CWL
19h 30m
2 stops
Multiple Airlines Logo
7:30 am - 6:50 pm
CWL
-
BOS
16h 20m
2 stops
$670Multiple Airlines
Sat, May 2 - Sat, May 9
Multiple Airlines Logo
11:30 pm - 9:20 pm
BOS
-
CWL
16h 50m
1 stop
Multiple Airlines Logo
7:30 am - 2:55 pm
CWL
-
BOS
12h 25m
1 stop
$672Multiple Airlines
Tue, Apr 28 - Tue, May 12
Multiple Airlines Logo
11:30 pm - 11:25 pm
BOS
-
CWL
18h 55m
1 stop
Multiple Airlines Logo
4:15 pm - 9:05 pm
CWL
-
BOS
33h 50m
2 stops
$680Multiple Airlines
Tue, Apr 21 - Tue, Apr 28
Multiple Airlines Logo
11:30 pm - 11:25 pm
BOS
-
CWL
18h 55m
1 stop
Multiple Airlines Logo
11:15 pm - 9:05 pm
CWL
-
BOS
50h 50m
2 stops
$694Multiple Airlines
Tue, Apr 28 - Tue, May 12
Delta Logo
6:55 pm - 9:15 am
BOS
-
CWL
9h 20m
1 stop
Delta Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$793Delta
Tue, Apr 28 - Tue, May 12
Delta Logo
12:30 pm - 9:15 am
BOS
-
CWL
15h 45m
2 stops
Delta Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$797Delta
Mon, Apr 6 - Mon, Apr 13
Multiple Airlines Logo
5:20 pm - 10:50 pm
BOS
-
CWL
24h 30m
1 stop
Multiple Airlines Logo
10:10 pm - 9:05 pm
CWL
-
BOS
27h 55m
2 stops
$799Multiple Airlines
Tue, Apr 28 - Tue, May 12
Delta Logo
12:30 pm - 9:15 am
BOS
-
CWL
15h 45m
2 stops
Delta Logo
9:45 am - 11:29 pm
CWL
-
BOS
18h 44m
2 stops
$807Delta
Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
4:35 pm - 9:15 am
BOS
-
CWL
11h 40m
1 stop
Multiple Airlines Logo
5:15 pm - 1:13 pm
CWL
-
BOS
24h 58m
1 stop
$820Multiple 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 February, where tickets cost $687 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $1,419 and $1,016 respectively.

Good to know

Low seasonFebruary
Cheapest flight$480
Best time to beat the crowds with an average 26% 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 $480 for a one-way ticket and $524 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 $964 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 8276 reviews
8.1Boarding
8.5Crew
7.9Comfort
7.8Entertainment
7.2Food
Airline reviews

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

8.0 ExcellentMary, Mar 2026
LGA - MKE
Read more Delta reviews

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

Delayed. Hot. Passenger next to me was so large I couldn’t move.

Same experience as the flight from Norfolk to Atlanta where people are boarded in zones that don't make sense. People behind you on the plane will get on before you and they take the luggage space on your row.

The boarding process doesn't make sense since some people that will sit behind your rows are boarded before you and then they take up the luggage space above your head. I then have to wait for people to get off the plane before I can go back to get my luggage.

Good flight. Connector flight was delayed so made a short turnaround in Atlanta which was stressful. Otherwise, great crew, Staff in ATL was very informative about the delay and ensured people their connections were fine. Notified the ones that were not. Great communication.

The flight went very well, but the flight attendants didn't serve and food or drinks other than 1st class due to rough air but to be honest it wasn't that bumpy and I felt that they could've at least offered water and coffee perhaps. Also serving 1st class only is a bad look. I've been in 1st class many times and I would've felt that if the turbulence was too rough for the main cabin, it would be too rough for 1st class too.

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

It was really nice journey i personally recommend klm flight

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

Empty seats next to me - wish it had been for a longer flight!!

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.

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

Information on your arrival and departure airports