BOS - CWL

$801 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 9/4. 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
$801
Typical prices: $1,081-$960
Multiple Airlines
Tue 9/22Wed 9/30
BOS - CWL • 1 stop
Cheapest one-way
$463
Multiple Airlines
Fri 9/4
BOS - CWL • 1 stop
Top airlines
KLM
Cheapest • from $1,044 (round-trip)
Delta
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
Dublin (DUB)
Cheapest • Avg $566 (round-trip)
Dublin (DUB)
Shortest trip • 9h 25m (one-way)
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 29% price drop
May
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

Tue, Sep 22 - Wed, Sep 30
Multiple Airlines Logo
9:15 pm - 11:25 pm
BOS
-
CWL
21h 10m
1 stop
Multiple Airlines Logo
11:50 pm - 9:15 pm
CWL
-
BOS
26h 25m
2 stops
$801Multiple Airlines
Fri, Jun 12 - Tue, Jun 16
Multiple Airlines Logo
5:00 pm - 10:15 am
BOS
-
CWL
12h 15m
1 stop
Multiple Airlines Logo
11:15 pm - 10:39 pm
CWL
-
BOS
28h 24m
3 stops
$802Multiple Airlines
Thu, Oct 1 - Wed, Oct 7
Multiple Airlines Logo
5:25 pm - 7:20 am
BOS
-
CWL
8h 55m
1 stop
Multiple Airlines Logo
11:50 pm - 9:15 pm
CWL
-
BOS
26h 25m
2 stops
$806Multiple Airlines
Fri, Jun 12 - Fri, Jun 19
Multiple Airlines Logo
10:05 am - 10:15 am
BOS
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
10:45 pm - 5:35 pm
CWL
-
BOS
23h 50m
2 stops
$821Multiple Airlines
Fri, Jun 12 - Fri, Jun 19
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
$825Multiple Airlines
Thu, Jun 11 - Thu, Jun 18
Multiple Airlines Logo
5:50 am - 10:20 pm
BOS
-
CWL
35h 30m
3 stops
Multiple Airlines Logo
10:50 pm - 8:55 pm
CWL
-
BOS
27h 05m
3 stops
$837Multiple Airlines
Fri, Jun 12 - Tue, Jun 16
Multiple Airlines Logo
5:00 pm - 10:15 am
BOS
-
CWL
12h 15m
1 stop
Multiple Airlines Logo
11:15 pm - 5:35 pm
CWL
-
BOS
23h 20m
2 stops
$840Multiple Airlines
Fri, Jun 12 - Tue, Jun 16
Multiple Airlines Logo
5:50 am - 10:15 am
BOS
-
CWL
23h 25m
2 stops
Multiple Airlines Logo
11:15 pm - 10:39 pm
CWL
-
BOS
28h 24m
3 stops
$852Multiple Airlines
Wed, Jun 10 - Wed, Jun 17
Multiple Airlines Logo
6:35 pm - 10:15 am
BOS
-
CWL
10h 40m
1 stop
Multiple Airlines Logo
11:30 pm - 6:22 pm
CWL
-
BOS
23h 52m
3 stops
$859Multiple Airlines
Wed, Jun 10 - Wed, Jun 17
Multiple Airlines Logo
3:25 pm - 10:15 am
BOS
-
CWL
13h 50m
2 stops
Multiple Airlines Logo
11:30 pm - 6:22 pm
CWL
-
BOS
23h 52m
3 stops
$865Multiple 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 September.

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 $1,360 respectively.

Find deals

Good to know

Low seasonFebruary
Cheapest flight$463
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 $463 for a one-way ticket and $801 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.

  • 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 airline 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 8467 reviews
7.8Entertainment
7.2Food
7.9Comfort
8.5Crew
8.1Boarding
Airline reviews

The flight was operated by Latam. The aircraft had a technical issue and the flight was delayed for the next day. They grounded other passengers to get their airplane assigned to my flight. Most of he ground staff don't speak English (Orlando Airport), but were very polite.The crew on the other hand could speak English and Portuguese. On board service was good.

6.0 GoodSilvestre, Apr 2026
MCO - GRU
Read more Delta reviews

The flight was operated by Latam. The aircraft had a technical issue and the flight was delayed for the next day. They grounded other passengers to get their airplane assigned to my flight. Most of he ground staff don't speak English (Orlando Airport), but were very polite.The crew on the other hand could speak English and Portuguese. On board service was good.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

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 you need to know for your flight from Boston to Cardiff

Information on your arrival and departure airports

Boston (BOS)
Cardiff (CWL)