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BOS - CWL

$851 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
$851
Typical prices: $830-$1,360
Multiple Airlines
Thu 11/15Thu 11/22
BOS - CWL • 1 stop
When to travel
February
Cheapest • 44% price drop
April
Most popular
Good to know
+1
Good to know
+1
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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

Sun, Nov 15 - Sun, Nov 22
Multiple Airlines Logo
5:15 pm - 8:10 amBOS  Boston Logan Intl-CWL Cardiff Wales
9h 55m1 stop Dublin
Multiple Airlines Logo
9:05 am - 4:15 pmCWL  Cardiff Wales-BOS Boston Logan Intl
36h 10m2 stops Alicante Shannon
$851Multiple Airlines
Sun, Nov 15 - Sun, Nov 22
Multiple Airlines Logo
5:15 pm - 8:10 amBOS  Boston Logan Intl-CWL Cardiff Wales
9h 55m1 stop Dublin
Multiple Airlines Logo
2:25 pm - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
28h 30m1 stop Dublin
$906Multiple Airlines
Sat, Jan 2 - Sat, Jan 30
Multiple Airlines Logo
9:20 pm - 8:10 amBOS  Boston Logan Intl-CWL Cardiff Wales
29h 50m1 stop Dublin
Multiple Airlines Logo
8:15 am - 2:15 pmCWL  Cardiff Wales-BOS Boston Logan Intl
11h 00m1 stop Dublin
$908Multiple Airlines
Mon, Nov 2 - Mon, Nov 16
Multiple Airlines Logo
7:50 pm - 11:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
34h 55m3 stops Reykjavik Keflavik Intl Glasgow Intl Belfast City
Multiple Airlines Logo
8:35 am - 2:45 pmCWL  Cardiff Wales-BOS Boston Logan Intl
35h 10m3 stops Dublin Barcelona-El Prat Lisbon Humberto Delgado
$962Multiple Airlines
Sun, Nov 15 - Sun, Nov 22
Multiple Airlines Logo
7:50 pm - 11:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
34h 55m3 stops Reykjavik Keflavik Intl Glasgow Intl Belfast City
Multiple Airlines Logo
9:05 am - 1:55 pmCWL  Cardiff Wales-BOS Boston Logan Intl
33h 50m2 stops Alicante Dublin
$1,013Multiple Airlines
Sat, Jan 2 - Sat, Jan 30
Multiple Airlines Logo
7:50 pm - 1:55 pmBOS  Boston Logan Intl-CWL Cardiff Wales
13h 05m2 stops Reykjavik Keflavik Intl Dublin
Multiple Airlines Logo
8:15 am - 2:15 pmCWL  Cardiff Wales-BOS Boston Logan Intl
11h 00m1 stop Dublin
$1,068Multiple Airlines
Sun, Nov 15 - Sun, Nov 22
Multiple Airlines Logo
7:50 pm - 11:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
34h 55m3 stops Reykjavik Keflavik Intl Glasgow Intl Belfast City
Multiple Airlines Logo
2:25 pm - 7:05 pmCWL  Cardiff Wales-BOS Boston Logan Intl
9h 40m1 stop Dublin
$1,072Multiple Airlines
Mon, Nov 16 - Mon, Nov 23
KLM Logo
7:25 pm - 9:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
9h 20m1 stop Amsterdam Schiphol
KLM Logo
5:30 pm - 2:13 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 43m1 stop Amsterdam Schiphol
$1,130KLM
Mon, Nov 16 - Mon, Nov 23
KLM Logo
1:37 pm - 9:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
15h 08m2 stops New York John F Kennedy Intl Amsterdam Schiphol
KLM Logo
5:30 pm - 2:13 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 43m1 stop Amsterdam Schiphol
$1,134KLM
Mon, Nov 16 - Mon, Nov 23
KLM Logo
1:37 pm - 9:45 amBOS  Boston Logan Intl-CWL Cardiff Wales
15h 08m2 stops New York John F Kennedy Intl Amsterdam Schiphol
KLM Logo
5:30 pm - 2:13 pmCWL  Cardiff Wales-BOS Boston Logan Intl
25h 43m1 stop Amsterdam Schiphol
$1,135KLM
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 ($1,130) 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

January

Cheapest flight

$851
Beat the crowds with an average 70% drop in travelers.
The most popular month to fly with an average 200% increase in travelers.
Round-trip 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.

  • 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 $1,224 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 $851 to $6,761. That means the highest observed fare was about 8x higher than the lowest one.

  • 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
    • Enterprise Rent-A-Car
    • Avis
    • 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?

    Most connecting flights from Boston to Cardiff pass through Amsterdam Schiphol (AMS), which handles 100% of one-stop traffic on this route.

  • 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.

  • 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 February. Fares historically average $687 round-trip in that month - typically $1,340 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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