BOS - CWL

$684 Find Cheap Flights from Boston to Cardiff

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'] departing on 2/16. 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 $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'], 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 $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'], as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$684
Overall average: $774
Multiple Airlines
lun. 2/16mar. 3/3
BOS - CWL • 1 stop
Cheapest one-way
Multiple Airlines
ven. 2/6
BOS - CWL • multi-stop
Top airlines
KLM
Cheapest • from $691 (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
Start a new search
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 $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from ']$[1, preposition:'to ']$[1, article:'to ']$[1, place:'to'] (BOS-CWL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1, preposition:'to ']$[1,article:'to ']$[1, place:'to'] 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 $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to '] $[1,article:'to ']$[1,place:'to']

lun., févr. 16 - mar., mars 3
Multiple Airlines Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m
1 stop
Multiple Airlines Logo
10:20 am - 11:26 pm
CWL
-
BOS
18h 06m
2 stops
$684Multiple Airlines
lun., févr. 16 - mar., mars 3
KLM Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m
1 stop
KLM Logo
5:25 pm - 1:20 pm
CWL
-
BOS
24h 55m
1 stop
$691KLM
lun., févr. 16 - mar., mars 3
Delta Logo
10:03 am - 9:50 am
BOS
-
CWL
18h 47m
2 stops
Delta Logo
10:20 am - 9:14 am
CWL
-
BOS
27h 54m
2 stops
$697Delta
dim., mars 22 - dim., mars 29
Multiple Airlines Logo
6:10 pm - 11:05 pm
BOS
-
CWL
24h 55m
1 stop
Multiple Airlines Logo
9:45 pm - 9:05 pm
CWL
-
BOS
28h 20m
2 stops
$738Multiple Airlines
dim., mars 22 - dim., mars 29
KLM Logo
8:10 pm - 9:50 am
BOS
-
CWL
9h 40m
1 stop
KLM Logo
5:15 pm - 1:13 pm
CWL
-
BOS
24h 58m
1 stop
$743KLM
mer., avr. 15 - dim., avr. 19
Delta Logo
12:30 pm - 9:15 am
BOS
-
CWL
15h 45m
2 stops
Delta Logo
9:50 am - 4:25 pm
CWL
-
BOS
11h 35m
1 stop
$761Delta
mer., avr. 15 - dim., avr. 19
Multiple Airlines Logo
11:00 pm - 10:25 pm
BOS
-
CWL
18h 25m
2 stops
Multiple Airlines Logo
9:45 pm - 3:40 pm
CWL
-
BOS
22h 55m
3 stops
$851Multiple Airlines
dim., mars 22 - dim., mars 29
Multiple Airlines Logo
11:45 pm - 11:05 pm
BOS
-
CWL
19h 20m
2 stops
Multiple Airlines Logo
9:45 pm - 7:55 pm
CWL
-
BOS
27h 10m
3 stops
$874Multiple Airlines
mer., avr. 15 - dim., avr. 19
Delta Logo
12:30 pm - 9:15 am
BOS
-
CWL
15h 45m
2 stops
Delta Logo
9:50 am - 11:02 pm
CWL
-
BOS
18h 12m
2 stops
$902Delta
dim., mars 22 - dim., mars 29
Multiple Airlines Logo
1:00 pm - 11:05 pm
BOS
-
CWL
30h 05m
3 stops
Multiple Airlines Logo
9:45 pm - 7:55 pm
CWL
-
BOS
27h 10m
3 stops
$937Multiple Airlines
Booking Insights

KAYAK's insights & trends for $[0,place:'default'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'] flights

Get data-powered insights and trends into flights $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'] 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$684
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 $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from ']$[1, preposition:'to ']$[1, article:'to ']$[1, place:'to']

Are your dates flexible? Find out the best times to travel $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to'] 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 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 $684 for a round-trip ticket.

  • 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 to Cardiff?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from to Cardiff?

    SkyTeam is the only airline alliance operating flights between Boston and Cardiff.

  • Which is the best airline for flights $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from'] $[1, preposition:'to ']$[1, article:'to ']$[1, place:'to'], Delta or KLM?

    The two airlines most popular with KAYAK users for flights $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from'] $[1, preposition:'to ']$[1, article:'to ']$[1, place:'to'] 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 $827 and an overall rating of 7.7.

  • How does KAYAK find such low prices on flights from 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 to Cardiff.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from to Cardiff?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Cardiff from 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 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 with another airline. Booking your flights between 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 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 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 $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from ']$[1, preposition:'to ']$[1, article:'to ']$[1, place:'to']

 
See real verified KAYAK customer reviews for airlines flying $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to']. 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 $[0,preposition:'from ']$[0,article:'from ']$[0,place:'from'] $[1,preposition:'to ']$[1,article:'to ']$[1,place:'to']? 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 8162 reviews
7.9Comfort
8.5Crew
7.2Food
7.8Entertainment
8.1Boarding
Airline reviews

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

2.0 MediocreKeenan, Feb 2026
GEG - SEA
Read more Delta reviews

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Second flight in a row where the entertainment system is broken. 5 hour long flight with no entertainment and flight attendants did not seem interested in resolving the matter. Very shocked to be treated this poorly considering I paid for a first class experience and have Diamond Medallion status.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

It was nt delta. It was aeromexo. Service was awful. They served a very small drink and NO snack for a 3hr and 35min flight. Then for the first 30 min of the flight is was talk and talk over head interruption the movie/ show i picked to watch.

Comfort seating was on the tight side. Maybe it was a smaller plane(?)

I was given middle seat on this flight and prior Boston to Seoul flight That is a problem for long flights, Kayak system did not give me a change to select my seats and assigned me middle seats regardless of my elevated status in Delta. This needs immediate attention.

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

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 $[0, preposition:'from ']$[0, article:'from ']$[0, place:'from'] $[1, preposition:'to ']$[1,article:'to ']$[1, place:'to']

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