BOS - CWL

$561 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 8/10. 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
$750
Typical prices: $1,854-$922
Multiple Airlines
Fri 5/8Fri 5/15
BOS - CWL • 1 stop
Cheapest one-way
$333
Multiple Airlines
Mon 8/10
BOS - CWL • 1 stop
Top airlines
Cheapest • from $997 (round-trip)
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
Cheapest • Avg $566 (round-trip)
Shortest trip • 9h 25m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 26% price drop
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

Fri, May 8 - Fri, May 15
Multiple Airlines Logo
5:25 pm - 6:55 am
BOS
-
CWL
8h 30m
1 stop
Multiple Airlines Logo
5:45 pm - 9:05 pm
CWL
-
BOS
32h 20m
2 stops
$750Multiple Airlines
Wed, Apr 22 - Wed, May 13
Multiple Airlines Logo
9:15 pm - 10:25 pm
BOS
-
CWL
20h 10m
1 stop
Multiple Airlines Logo
11:30 pm - 5:35 pm
CWL
-
BOS
23h 05m
2 stops
$806Multiple Airlines
Mon, Apr 6 - Tue, Apr 14
Multiple Airlines Logo
5:20 pm - 10:50 pm
BOS
-
CWL
24h 30m
1 stop
Multiple Airlines Logo
9:45 pm - 9:05 pm
CWL
-
BOS
52h 20m
2 stops
$823Multiple Airlines
Wed, May 6 - Mon, May 11
Multiple Airlines Logo
11:30 pm - 10:25 pm
BOS
-
CWL
17h 55m
1 stop
Multiple Airlines Logo
1:35 pm - 9:05 pm
CWL
-
BOS
36h 30m
2 stops
$852Multiple Airlines
Wed, May 6 - Mon, May 11
Multiple Airlines Logo
11:15 pm - 10:25 pm
BOS
-
CWL
18h 10m
3 stops
Multiple Airlines Logo
10:10 pm - 9:27 pm
CWL
-
BOS
28h 17m
3 stops
$860Multiple Airlines
Tue, May 26 - Mon, Jun 8
Multiple Airlines Logo
8:30 pm - 10:15 am
BOS
-
CWL
32h 45m
1 stop
Multiple Airlines Logo
11:35 am - 9:05 am
CWL
-
BOS
26h 30m
1 stop
$866Multiple Airlines
Tue, May 26 - Mon, Jun 8
Multiple Airlines Logo
8:30 pm - 10:15 am
BOS
-
CWL
32h 45m
1 stop
Multiple Airlines Logo
11:35 am - 4:00 pm
CWL
-
BOS
33h 25m
2 stops
$869Multiple Airlines
Wed, May 6 - Mon, May 11
Multiple Airlines Logo
11:15 pm - 10:25 pm
BOS
-
CWL
18h 10m
3 stops
Multiple Airlines Logo
10:10 pm - 10:39 pm
CWL
-
BOS
29h 29m
2 stops
$896Multiple Airlines
Sun, May 10 - Sun, May 17
Multiple Airlines Logo
9:15 pm - 9:45 pm
BOS
-
CWL
19h 30m
1 stop
Multiple Airlines Logo
5:40 pm - 6:50 pm
CWL
-
BOS
30h 10m
2 stops
$907Multiple Airlines
Fri, Jun 5 - Fri, Jun 12
Multiple Airlines Logo
10:05 am - 10:15 am
BOS
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
10:45 pm - 10:39 pm
CWL
-
BOS
28h 54m
3 stops
$917Multiple 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.

How much is a round-trip flight from Boston to Cardiff?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boston to Cardiff departing in May.

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 $1,051 respectively.

Good to know

Low seasonFebruary
Cheapest flight$333
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly with an average 12% 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 $333 for a one-way ticket and $750 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 $999 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 $981 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 8342 reviews
7.9Comfort
8.5Crew
7.8Entertainment
7.2Food
8.1Boarding
Airline reviews

Delta is always a wonderful experience. A clean plane and the crew is really friendly.

10.0 ExcellentCharlean, Mar 2026
LAS - ATL
Read more Delta reviews

Delta is always a wonderful experience. A clean plane and the crew is really friendly.

Too many people are taking up space in the overhead bins with their extra piece of luggage. Since they cannot fit their backpacks or extra luggage piece under the seat in front of them, they store it in the overheads and thus taking up room for other passengers. It wasn’t only one or two persons; more like 12 or 13 passengers.

Excellent service, I love the soft blush pink mood lighting on the 767-400ER during meal service. The overhead gasper vents on the 767-400ER were also very strong with a lot of airflow to keep me comfortable on my flight.

This was the worse experience. They delayed our flight twice and we still had to find another flight to get home sooner which was alos delayed. Also, the flight attendant named Ginny on DL9890 leaving at 4:13pm on 3/23/26 was extremely rude.

I love Delta the flight attendants were personable and the flight arrived 1/2 earlier thanks expected. All a plus. The gate agent was a bit flustered but even with that I still had a good experience. Her supervisor assisted me.

The return flight was great. The flight out to CDG was overbooked, and we were forced to check in a small carry-on at the get immediately before the flight, before getting out the stuff we needed on the plane.

Got to fly my favorite plane, the Boeing 767-400ER, to Milan. The soft blush pink mood lighting during meal service was very beautiful and gorgeous. The service was top-notch, and our flights were on time. I highly recommend Delta.

I am still at the Airport! Delayed Delayed and Delyaed

I took seat 15A in anticipation of window seat, there is no window.

The first class flight attendant was awful to everyone. Very rude; no customer service. She should not be working in first class.

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.

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.

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

Information on your arrival and departure airports