BOS - CWL

$440 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 from Boston to Cardiff departing on 1/16. 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 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$440
Overall average: $735
Multiple Airlines
Fri 1/16Fri 1/23
BOS - CWL • 2 stops
Cheapest one-way
Multiple Airlines
Thu 12/4
BOS - CWL • multi-stop
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
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

Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
6:15 am - 7:40 pm
BOS
-
CWL
32h 25m2 stops
Multiple Airlines Logo
10:25 pm - 6:02 pm
CWL
-
BOS
24h 37m2 stops
$440Multiple Airlines
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
10:15 am - 7:40 pm
BOS
-
CWL
28h 25m3 stops
Multiple Airlines Logo
10:25 pm - 6:02 pm
CWL
-
BOS
24h 37m2 stops
$443Multiple Airlines
Fri, Feb 6 - Fri, Feb 20
Multiple Airlines Logo
10:15 am - 7:40 pm
BOS
-
CWL
28h 25m3 stops
Multiple Airlines Logo
10:25 pm - 3:57 pm
CWL
-
BOS
22h 32m2 stops
$478Multiple Airlines
Fri, Feb 6 - Fri, Feb 20
Virgin Atlantic Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m1 stop
Virgin Atlantic Logo
10:20 am - 6:55 pm
CWL
-
BOS
13h 35m1 stop
$673Virgin Atlantic
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
5:10 pm - 7:40 pm
BOS
-
CWL
21h 30m1 stop
Multiple Airlines Logo
10:25 pm - 8:55 pm
CWL
-
BOS
27h 30m2 stops
$677Multiple Airlines
Wed, Feb 4 - Sun, Feb 8
Delta Logo
7:10 pm - 9:50 am
BOS
-
CWL
9h 40m1 stop
Delta Logo
10:15 am - 6:55 pm
CWL
-
BOS
13h 40m1 stop
$701Delta
Thu, Jan 22 - Thu, Feb 12
KLM Logo
1:00 pm - 9:50 am
BOS
-
CWL
15h 50m2 stops
KLM Logo
10:20 am - 1:25 pm
CWL
-
BOS
32h 05m1 stop
$702KLM
Wed, Feb 4 - Sun, Feb 8
Delta Logo
1:00 pm - 9:50 am
BOS
-
CWL
15h 50m2 stops
Delta Logo
10:15 am - 1:25 pm
CWL
-
BOS
32h 10m1 stop
$706Delta
Thu, Jan 22 - Thu, Feb 12
KLM Logo
1:00 pm - 9:50 am
BOS
-
CWL
15h 50m2 stops
KLM Logo
10:20 am - 10:48 pm
CWL
-
BOS
17h 28m2 stops
$707KLM
Wed, Feb 4 - Sun, Feb 8
Virgin Atlantic Logo
11:12 am - 9:50 am
BOS
-
CWL
17h 38m2 stops
Virgin Atlantic Logo
5:30 pm - 10:22 pm
CWL
-
BOS
33h 52m2 stops
$716Virgin Atlantic
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$440
Best time to beat the crowds but there is an average 49% increase in price.
Most popular time to fly with an average 7% 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 $440 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 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 $992 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 7.7.

  • 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 8011 reviews
8.1Boarding
8.5Crew
7.3Food
7.9Entertainment
7.9Comfort
Airline reviews

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

4.0 OkayCarl, Dec 2025
FLL - LGA
Read more Delta reviews

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

First, Delta needs more flights to/from Miami. Second, a 1000pm leaving at 1230pm is unacceptable from their biggest airport world hub. Another aircraft could have been used such as the aircraft scheduled to be used in the morning for that exact same route. Yes, I did get me there but the lack of sleep the next day didn't help me enjoy my entire trip since I was busy with activities during the weekend. This can be and is expected from Spirit (going bankrupt) and Frontier (despite they're nickel and dimers). But from Delta's World Hub? That's totally unacceptable!

This flight was straightforward and without difficulty. Service was OK, but I continue to be underwhelmed by level of attention given to Sky Priority passengers.

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!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

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

Information on your arrival and departure airports