BOS - CWL

$291 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 7/15. 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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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$541
Overall average: $783
Multiple Airlines
Wed 3/25Tue 3/31
BOS - CWL • 2 stops
Cheapest one-way
$291
Multiple Airlines
Wed 7/15
BOS - CWL • 1 stop
Top airlines
KLM
Cheapest • from $792 (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
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 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

Wed, Mar 25 - Tue, Mar 31
Multiple Airlines Logo
5:25 pm - 3:10 pm
BOS
-
CWL
17h 45m
2 stops
Multiple Airlines Logo
4:15 pm - 3:10 pm
CWL
-
BOS
27h 55m
2 stops
$541Multiple Airlines
Wed, Mar 25 - Tue, Mar 31
Multiple Airlines Logo
6:10 pm - 10:05 am
BOS
-
CWL
11h 55m
1 stop
Multiple Airlines Logo
9:45 pm - 9:05 pm
CWL
-
BOS
52h 20m
2 stops
$673Multiple Airlines
Mon, Mar 23 - Wed, Mar 25
Multiple Airlines Logo
8:10 pm - 4:55 pm
BOS
-
CWL
16h 45m
1 stop
Multiple Airlines Logo
10:20 am - 11:53 pm
CWL
-
BOS
17h 33m
2 stops
$776Multiple Airlines
Wed, Mar 25 - Tue, Mar 31
KLM Logo
9:50 pm - 4:55 pm
BOS
-
CWL
15h 05m
1 stop
KLM Logo
9:45 am - 1:13 pm
CWL
-
BOS
32h 28m
1 stop
$792KLM
Mon, Mar 23 - Wed, Mar 25
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
$821KLM
Mon, Mar 23 - Wed, Mar 25
Multiple Airlines Logo
5:15 pm - 9:50 am
BOS
-
CWL
12h 35m
2 stops
Multiple Airlines Logo
10:20 am - 11:53 pm
CWL
-
BOS
17h 33m
2 stops
$836Multiple Airlines
Sun, May 24 - Sun, May 31
Multiple Airlines Logo
10:05 am - 10:15 am
BOS
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
9:45 pm - 10:39 pm
CWL
-
BOS
29h 54m
3 stops
$838Multiple Airlines
Sun, May 24 - Sun, May 31
Multiple Airlines Logo
5:50 am - 10:15 am
BOS
-
CWL
23h 25m
3 stops
Multiple Airlines Logo
9:45 pm - 10:39 pm
CWL
-
BOS
29h 54m
3 stops
$854Multiple Airlines
Sun, May 24 - Sun, May 31
Multiple Airlines Logo
5:50 am - 10:15 am
BOS
-
CWL
23h 25m
2 stops
Multiple Airlines Logo
9:45 pm - 10:39 pm
CWL
-
BOS
29h 54m
3 stops
$855Multiple Airlines
Sun, May 24 - Sun, May 31
KLM Logo
6:50 pm - 4:45 pm
BOS
-
CWL
16h 55m
1 stop
KLM Logo
5:15 pm - 1:08 pm
CWL
-
BOS
24h 53m
1 stop
$871KLM
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$291
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 $291 for a one-way ticket and $541 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 8180 reviews
7.2Food
7.8Entertainment
8.1Boarding
7.9Comfort
8.5Crew
Airline reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

2.0 MediocreJaspreet, Feb 2026
SEA - SMF
Read more Delta reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

This was one of the worst flights I’ve been on in years. I upgraded to comfort and had such an uncomfortable experience. The person next to me was oversized - which I understand - however, they took up their space and mine. I could only use about 50% of my seat space to not be physically touching this person the entire flight and there was no spatial awareness. I also could not use the seat outlet because their body was obstructing it. It was very inconvenient. Their body kept touching me repeatedly during the flight and I felt very uncomfortable. To pay more for an upgraded space and then not even being able to use it was highly disappointing.

No wheel chair as requested at Atlanta arrival on first flight.

Only freetext wifi was available in flight; browsing WiFi required payment. Since the seats had no in flight entertainment, Delta should revisit this policy on this longer flight.

Only water, tea or coffee served midflight, even to comfort seating. Man next to me needed two seats and took up a portion of my seat and Delta did nothing.

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

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.

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