BOS - CWL

$357 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 6/15. 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
$542
Overall average: $783
Multiple Airlines
Sun 3/29Fri 4/10
BOS - CWL • 1 stop
Cheapest one-way
$357
Multiple Airlines
Mon 6/15
BOS - CWL • 1 stop
Top airlines
Virgin Atlantic
Cheapest • from $673 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 22% 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
Multiple Airlines Logo
9:15 pm - 10:00 pm
BOS
-
CWL
19h 45m1 stop
Multiple Airlines Logo
10:45 pm - 9:05 pm
CWL
-
BOS
27h 20m2 stops
$542Multiple Airlines
Sun, Mar 29 - Fri, Apr 10
Virgin Atlantic Logo
6:55 pm - 4:45 pm
BOS
-
CWL
16h 50m1 stop
Virgin Atlantic Logo
9:45 am - 6:30 pm
CWL
-
BOS
13h 45m1 stop
$673Virgin Atlantic
Sun, May 17 - Mon, May 25
Delta Logo
8:25 pm - 9:15 am
BOS
-
CWL
31h 50m1 stop
Delta Logo
9:45 am - 1:10 pm
CWL
-
BOS
32h 25m1 stop
$722Delta
Wed, May 20 - Wed, May 27
Delta Logo
6:00 am - 9:15 am
BOS
-
CWL
22h 15m2 stops
Delta Logo
9:45 am - 1:10 pm
CWL
-
BOS
32h 25m1 stop
$726Delta
Mon, May 18 - Tue, May 26
Delta Logo
4:35 pm - 9:15 am
BOS
-
CWL
11h 40m1 stop
Delta Logo
9:45 am - 8:47 pm
CWL
-
BOS
16h 02m2 stops
$732Delta
Wed, May 20 - Tue, May 26
Delta Logo
6:00 am - 9:15 am
BOS
-
CWL
22h 15m2 stops
Delta Logo
9:45 am - 10:36 pm
CWL
-
BOS
17h 51m2 stops
$736Delta
Sat, Feb 21 - Sat, Feb 28
KLM Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m1 stop
KLM Logo
5:25 pm - 1:20 pm
CWL
-
BOS
24h 55m1 stop
$758KLM
Mon, May 18 - Tue, May 26
Multiple Airlines Logo
5:30 pm - 10:50 pm
BOS
-
CWL
24h 20m1 stop
Multiple Airlines Logo
11:15 pm - 4:10 pm
CWL
-
BOS
21h 55m2 stops
$765Multiple Airlines
Sun, May 17 - Sun, May 24
Delta Logo
8:25 pm - 4:45 pm
BOS
-
CWL
15h 20m1 stop
Delta Logo
9:50 am - 6:30 pm
CWL
-
BOS
13h 40m1 stop
$777Delta
Sun, May 17 - Tue, May 26
Multiple Airlines Logo
11:30 pm - 10:00 pm
BOS
-
CWL
17h 30m1 stop
Multiple Airlines Logo
11:15 pm - 4:10 pm
CWL
-
BOS
21h 55m2 stops
$787Multiple 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 $1,141 respectively.

Good to know

Low seasonJune
Cheapest flight$357
Best time to beat the crowds but there is an average 50% increase in price.
Most popular time to fly with an average 5% 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 $357 for a one-way ticket and $542 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 8021 reviews
8.1Boarding
7.2Food
7.9Comfort
7.8Entertainment
8.5Crew
Airline reviews

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.

2.0 MediocreWilliam, Jan 2026
LGA - BOS
Read more Delta reviews

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.

Comfort Plus seat 11E seemed smaller than prior flights. The movie selection is good. Watched most of the most recent Tron movie. I'll watch the remaining part later as my movie is saved in the Delta Seatback Experience.

Flight was late from Newark to Atlanta, I asked flight attendant to please let my family of 3 out first when we landed to Atlanta because we were late for our connecting flight to Quito. She didn't and we were late for 5 minutes we couldn't board the plane and spend hours trying to get another flight with customer service for the next day.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Late delayed flight delays boarding and delays leaving and delays on arrival too. Cramped plane no room no food.

DTW line is too long. The flights from DTW to BWI are always delayed for unknown reasons.

Delta canceled our flight and we had to scramble to find another airline to get home. Phoenix is not a delta hub so they didn’t have another plane. It would have been a red eye though Salt Lake City. Getting in at 5am. No bueno.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

This flight was a first class choice and left much to be desired. Seat backs on seats were falling apart and torn. Seats actually didn't come to a "full & upright position". Pull out table was sprung. Not any significant leg room. All in all we were on an obviously older plane and felt overcharged for what we received as first class.

A 12 hour flight during the day with one real meal service - are you kidding? Also the breakfast was one of the worst and not what was listed

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