BOS - CWL

$518 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 6/20. 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
$740
Overall average: $964
Multiple Airlines
Thu 4/2Thu 4/9
BOS - CWL • 1 stop
Cheapest one-way
$518
Multiple Airlines
Sat 6/20
BOS - CWL • 2 stops
Top airlines
Virgin Atlantic
Cheapest • from $759 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
February
Cheapest • 25% 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

Thu, Apr 2 - Thu, Apr 9
Multiple Airlines Logo
9:15 pm - 10:20 pm
BOS
-
CWL
20h 05m
1 stop
Multiple Airlines Logo
4:55 pm - 9:05 pm
CWL
-
BOS
33h 10m
2 stops
$740Multiple Airlines
Fri, Apr 3 - Fri, Apr 10
Virgin Atlantic Logo
5:30 am - 9:15 am
BOS
-
CWL
22h 45m
2 stops
Virgin Atlantic Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$759Virgin Atlantic
Fri, Apr 3 - Fri, Apr 10
Delta Logo
11:30 am - 9:15 am
BOS
-
CWL
16h 45m
2 stops
Delta Logo
9:45 am - 11:49 pm
CWL
-
BOS
19h 04m
2 stops
$771Delta
Sat, Apr 4 - Sat, Apr 11
KLM Logo
4:35 pm - 9:15 am
BOS
-
CWL
11h 40m
1 stop
KLM Logo
5:35 pm - 4:25 pm
CWL
-
BOS
27h 50m
1 stop
$807KLM
Fri, Apr 3 - Fri, Apr 10
Virgin Atlantic Logo
4:35 pm - 9:15 am
BOS
-
CWL
11h 40m
1 stop
Virgin Atlantic Logo
9:45 am - 4:25 pm
CWL
-
BOS
11h 40m
1 stop
$811Virgin Atlantic
Tue, Mar 17 - Tue, Mar 24
KLM Logo
8:10 pm - 9:50 am
BOS
-
CWL
9h 40m
1 stop
KLM Logo
10:20 am - 2:20 pm
CWL
-
BOS
32h 00m
1 stop
$824KLM
Tue, Mar 17 - Tue, Mar 24
KLM Logo
5:15 pm - 9:50 am
BOS
-
CWL
12h 35m
2 stops
KLM Logo
10:20 am - 2:20 pm
CWL
-
BOS
32h 00m
1 stop
$828KLM
Thu, Apr 2 - Thu, Apr 9
Multiple Airlines Logo
9:15 pm - 6:55 am
BOS
-
CWL
28h 40m
1 stop
Multiple Airlines Logo
10:50 pm - 3:05 pm
CWL
-
BOS
21h 15m
1 stop
$832Multiple Airlines
Tue, Mar 17 - Tue, Mar 24
KLM Logo
5:15 pm - 9:50 am
BOS
-
CWL
12h 35m
2 stops
KLM Logo
10:20 am - 7:15 am
CWL
-
BOS
24h 55m
2 stops
$838KLM
Wed, Apr 15 - Sun, Apr 19
Delta Logo
11:51 am - 9:15 am
BOS
-
CWL
16h 24m
2 stops
Delta Logo
9:50 am - 4:25 pm
CWL
-
BOS
11h 35m
1 stop
$841Delta
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$518
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 9% 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 $518 for a one-way ticket and $740 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 $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 8212 reviews
7.8Entertainment
8.1Boarding
8.5Crew
7.2Food
7.9Comfort
Airline reviews

Terrible. Four hour delay because Delta could not find crew to man the aircraft. Terrible communication. Terrible insight into the delays. One of the worst flight experiences I’ve had.

2.0 MediocreDonna, Feb 2026
DEN - LGA
Read more Delta reviews

Terrible. Four hour delay because Delta could not find crew to man the aircraft. Terrible communication. Terrible insight into the delays. One of the worst flight experiences I’ve had.

It was good. The leg room was not great in Row 1.

The landing was the worst I’ve experienced with a flight.

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

First flight out and was 85 minutes delayed. Notification came out way too late

Delta flights recently are always delayed AND at jfk tney get the gates further away (need To walk 20’ to get to them/all the way at the end of the terminal). Not sure whats happening but price doesnt match experience!

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Good experience and the flight landed early. There was no food I had or entertainment.

Flight was delayed and no reasons provided. After the passengers were boarded, the crew made announcement that the captain has jot arrived and he would take another 15 mins. All passengers patiently sat until the captain came and started. Terrible experience!

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.

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.

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

Information on your arrival and departure airports