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BOS - CWL

$337 Find Cheap Flights from Boston to Cardiff - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$887
Typical prices: $830-$1,360
Multiple Airlines
Sun 12/2Sat 12/8
BOS - CWL • 1 stop
Cheapest one-way
$337
Typical prices: $403-$553
Multiple Airlines
Sun 1/14
BOS - CWL • 1 stop
When to travel
January
Cheapest • 29% price drop
April
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Dublin (DUB)
Cheapest • Avg $971 (round-trip)
Amsterdam Schiphol (AMS)
Shortest trip • 11h 32m (one-way)
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Cheap Flights from Boston to Cardiff (BOS-CWL)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to Cardiff

Wed, Dec 2 - Tue, Dec 8
Multiple Airlines Logo
5:15 pm - 1:00 pmBOS  Boston Logan Intl-CWL Cardiff Wales
14h 45m1 stop Dublin
Multiple Airlines Logo
12:15 pm - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
30h 40m3 stops Belfast City Glasgow Intl Dublin
$887Multiple Airlines
Thu, Nov 19 - Thu, Nov 26
Multiple Airlines Logo
5:15 pm - 3:40 pmBOS  Boston Logan Intl-CWL Cardiff Wales
17h 25m1 stop Dublin
Multiple Airlines Logo
1:25 pm - 2:40 pmCWL  Cardiff Wales-BOS Boston Logan Intl
30h 15m2 stops Dublin Lisbon Humberto Delgado
$918Multiple Airlines
Thu, Nov 19 - Thu, Nov 26
Multiple Airlines Logo
5:15 pm - 3:40 pmBOS  Boston Logan Intl-CWL Cardiff Wales
17h 25m1 stop Dublin
Multiple Airlines Logo
1:25 pm - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
29h 30m1 stop Dublin
$920Multiple Airlines
Wed, Dec 2 - Tue, Dec 8
KLM Logo
8:55 pm - 5:00 pmBOS  Boston Logan Intl-CWL Cardiff Wales
15h 05m1 stop Amsterdam Schiphol
KLM Logo
5:30 pm - 2:20 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 50m1 stop Amsterdam Schiphol
$951KLM
Wed, Dec 2 - Tue, Dec 8
KLM Logo
1:05 pm - 9:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
15h 40m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol
KLM Logo
5:30 pm - 2:20 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 50m1 stop Amsterdam Schiphol
$955KLM
Mon, Nov 2 - Mon, Nov 16
Multiple Airlines Logo
7:15 pm - 8:30 amBOS  Boston Logan Intl-CWL Cardiff Wales
56h 15m2 stops London Heathrow Belfast Intl
Multiple Airlines Logo
8:35 am - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
10h 20m1 stop Dublin
$1,023Multiple Airlines
Mon, Nov 2 - Mon, Nov 16
Multiple Airlines Logo
7:50 pm - 5:00 pmBOS  Boston Logan Intl-CWL Cardiff Wales
16h 10m3 stops Reykjavik Keflavik Intl Paris Charles de Gaulle Amsterdam Schiphol
Multiple Airlines Logo
5:30 pm - 2:45 pmCWL  Cardiff Wales-BOS Boston Logan Intl
26h 15m3 stops Amsterdam Schiphol Kastrup Copenhagen Lisbon Humberto Delgado
$1,070Multiple Airlines
Mon, Nov 2 - Mon, Nov 16
Multiple Airlines Logo
5:15 pm - 11:35 pmBOS  Boston Logan Intl-CWL Cardiff Wales
25h 20m3 stops Dublin Edinburgh Turnhouse Granadilla Tenerife-Sur
Multiple Airlines Logo
8:35 am - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
10h 20m1 stop Dublin
$1,111Multiple Airlines
Mon, Nov 2 - Mon, Nov 16
Multiple Airlines Logo
7:50 pm - 5:00 pmBOS  Boston Logan Intl-CWL Cardiff Wales
16h 10m3 stops Reykjavik Keflavik Intl Paris Charles de Gaulle Amsterdam Schiphol
Multiple Airlines Logo
8:35 am - 7:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
16h 20m2 stops Dublin Lisbon Humberto Delgado
$1,126Multiple Airlines
Mon, Nov 2 - Mon, Nov 16
KLM Logo
8:55 pm - 5:00 pmBOS  Boston Logan Intl-CWL Cardiff Wales
15h 05m1 stop Amsterdam Schiphol
KLM Logo
5:30 pm - 2:13 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 43m1 stop Amsterdam Schiphol
$1,127KLM
Booking Insights

Price, demand and travel trends for Boston to Cardiff flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Which airline is the cheapest to fly from Boston to Cardiff?

KLM ($951) offered the cheapest round-trip ticket from Boston to Cardiff in the last 5 days.

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Key details for Boston to Cardiff flights

Low season

November

Cheapest flight

$337
Beat the crowds with an average 42% drop in travelers.
The most popular month to fly with an average 190% increase in travelers.
One-way 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

Your Boston to Cardiff flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Boston to Cardiff?

    Only Economy Class is available on flights from Boston to Cardiff.

  • How long is a flight from Boston to Cardiff?

    There are currently no nonstop flights available from Boston to Cardiff. Flights with 1 layover take between 11h 32m and 12h 10m in total, depending on the connection.

  • Do I need a passport to fly from Boston to Cardiff?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a Boston to Cardiff flight?

    Round-trip flights from Boston to Cardiff range from $830 to $1,360, with an average of $1,166 over the past 12 months. Anything below $830 counts as a good deal.

  • Have flight prices from Boston to Cardiff changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $887 to $6,761. That means the highest observed fare was about 8x higher than the lowest one.

  • How are flight prices from Boston to Cardiff looking right now?

    One-way fares from Boston to Cardiff are currently in line with typical prices for this route. Average one-way fares are about $437.

  • What car rental options are available at Cardiff Wales Airport (CWL)?

    Cardiff Wales Airport (CWL) hosts 5 major car rental companies, with daily rates starting from around $15 for economy cars. Top options include:

    • Alamo
    • Budget
    • Avis
    • Enterprise Rent-A-Car
    • National

  • Which airports can I use when flying from Boston to Cardiff?

    Flights from Boston to Cardiff usually depart from Boston Logan Intl (BOS) and arrive at Cardiff Wales (CWL).

  • Which airports do connecting flights from Boston to Cardiff pass through?

    Connecting flights from Boston to Cardiff most commonly pass through:

    • Amsterdam Schiphol (AMS) - 96% of one-stop connections
    • Dublin (DUB) - 4% of one-stop connections

  • Can I save money by using flexible dates for flights from Boston to Cardiff?

    Yes. Flexible dates can save you up to 51% on flights from Boston to Cardiff. Thursday is the cheapest departure day at $839 round-trip on average, while Wednesday is the most expensive at $1,681, a difference of $842.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Boston to Cardiff?

    Flying via Amsterdam Schiphol (AMS) gives the shortest average 1-stop total travel time at 11h 32m, compared with 12h 10m via Dublin (DUB).

  • What is the time difference between Boston and Cardiff?

    Cardiff is 5 hours ahead of Boston (British Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

Your guide to booking Boston to Cardiff flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Wednesday. On this route, Thursday flights average $839, about $842 less than Wednesday fares (50% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Boston to Cardiff trip for January. Fares historically average $827 round-trip in that month - typically $1,200 less than the most expensive month, which is May (based on the last 12 months).

More options for your flight from Boston to Cardiff

Complete your trip to Cardiff with a hotel stay or car rental

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