BOS - CWL

$426 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 5/21. 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
$783
Overall average: $1,419
Multiple Airlines
Fri 6/5Fri 6/12
BOS - CWL • 1 stop
Cheapest one-way
$426
Multiple Airlines
Thu 5/21
BOS - CWL • 1 stop
Top airlines
Cheapest • from $1,045 (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 • 29% 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, 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 - 8:55 pm
CWL
-
BOS
27h 10m
3 stops
$783Multiple Airlines
Thu, Jun 11 - Tue, Jun 16
Multiple Airlines Logo
10:45 am - 10:20 pm
BOS
-
CWL
30h 35m
2 stops
Multiple Airlines Logo
11:15 pm - 9:50 am
CWL
-
BOS
39h 35m
3 stops
$785Multiple Airlines
Thu, Jun 11 - Tue, Jun 16
Multiple Airlines Logo
5:50 am - 10:20 pm
BOS
-
CWL
35h 30m
3 stops
Multiple Airlines Logo
11:15 pm - 9:50 am
CWL
-
BOS
39h 35m
3 stops
$787Multiple Airlines
Thu, Jun 11 - Tue, Jun 16
Multiple Airlines Logo
10:45 am - 10:20 pm
BOS
-
CWL
30h 35m
2 stops
Multiple Airlines Logo
11:15 pm - 5:35 pm
CWL
-
BOS
23h 20m
2 stops
$791Multiple Airlines
Fri, Jun 5 - Fri, Jun 12
Multiple Airlines Logo
5:50 am - 10:15 am
BOS
-
CWL
23h 25m
2 stops
Multiple Airlines Logo
10:45 pm - 8:55 pm
CWL
-
BOS
27h 10m
3 stops
$794Multiple Airlines
Sun, Jun 7 - Sun, Jun 14
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
$801Multiple Airlines
Sun, Jun 7 - Sun, Jun 14
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
$810Multiple Airlines
Sat, May 23 - Sat, May 30
Multiple Airlines Logo
9:40 pm - 9:20 pm
BOS
-
CWL
18h 40m
2 stops
Multiple Airlines Logo
11:35 am - 9:49 am
CWL
-
BOS
27h 14m
2 stops
$899Multiple Airlines
Sun, Jun 7 - Sun, Jun 14
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
2 stops
$910Multiple Airlines
Thu, Jun 11 - Tue, Jun 16
Multiple Airlines Logo
5:25 pm - 10:20 pm
BOS
-
CWL
23h 55m
1 stop
Multiple Airlines Logo
11:15 pm - 5:35 pm
CWL
-
BOS
23h 20m
2 stops
$916Multiple 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 June.

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 May, where the average cost of round-trip tickets is $1,419 and $1,365 respectively.

Good to know

Low seasonFebruary
Cheapest flight$426
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 41% 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 $426 for a one-way ticket and $783 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 $977 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 8444 reviews
7.2Food
7.9Comfort
8.5Crew
8.1Boarding
7.8Entertainment
Airline reviews

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

4.0 OkayLifia, Apr 2026
BOS - SEA
Read more Delta reviews

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

Everything was great. The only issue is unfixable. Seats are too small. 😁🤪

This wasn't my experience with Delta. It was just the Pegasus flight. Seats were very hard. Staff was kinda rough. Not very nice. Charged me for snacks. For a 4 hour flight I would've expected more.

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

The baggage belt was not updated on the Delta App and was displayed on the wrong belt board. Was not expecting this to happen.

The plan was delayed and left DC 90 minutes late. However, it showed a 20 minute delay on the delta app, then a 12 min delay. It turned out to be an hour delay. I found out where the plane was with flightaware. Stop keeping customers in the dark about what is going on.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

Landed without a gate ready. Plane is extremely old and dirty.

All the amenities was wonderful, if they could keep their prices that low. I'd fly with them all the time.

Very old plane with no inflight entertainment. I purchased the internet pass and it was nearly unusable.

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

The flight was delayed. The aircraft was unclean. Promised seat was not given due to change in Aircraft. Not one crew on ground was in a position to give any response. Amsterdam Airport is AVIODABLE Over crowded. Over Expensive. Poor Services.

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 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.

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

Information on your arrival and departure airports