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$521+ Cheap flights from Washington to Cardiff (CWL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CWL
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Washington to Cardiff

Keep the following information in mind while searching for Washington to Cardiff flight deals. Data was last updated August 14, 2025.

Round-trip from

$996
(Delta)

One-way from

$521
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$929
From Washington to Cardiff Wales
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One-way flight from Washington to Cardiff Wales
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Highest demand for flights based on searches. 18% potential increase in price ($266 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($60 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Washington to Cardiff

Cheapest flights from Washington to Cardiff
Explore the most affordable flight options available from Washington to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:40 pmSEA - CWL
1 stop15h 25mDelta
Fri 10/39:50 amCWL - SEA
2 stops20h 11mDelta
Deal found 8/12$996
This KLM deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:40 pmSEA - CWL
1 stop31h 35mKLM
Fri 10/35:15 pmCWL - SEA
1 stop26h 35mKLM
Deal found 8/12$1,035
This KLM deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/135:40 pmSEA - CWL
1 stop31h 35mKLM
Fri 9/195:15 pmCWL - SEA
1 stop30h 50mKLM
Deal found 8/13$1,119
This KLM deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:45 amSEA - CWL
2 stops17h 30mMultiple Airlines
Fri 9/199:50 amCWL - SEA
2 stops18h 26mMultiple Airlines
Deal found 8/12$1,215
This Mytrip deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/268:40 amSEA - CWL
3 stops24h 25mMultiple Airlines
Fri 10/35:15 pmCWL - SEA
3 stops35h 25mMultiple Airlines
Deal found 8/12$1,494

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Cardiff that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Washington to Cardiff that are best for you.

Fly from

Washington

Fly to

Cardiff

Route

Depart

Return

Price

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 9/26

5:40 pm-5:05 pm

1 stop15h 25m

Cardiff Wales

Fri 10/3

9:50 am-10:01 pm

2 stops20h 11m

$996

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 9/26

5:40 pm-9:15 am

1 stop31h 35m

Cardiff Wales

Fri 10/3

5:15 pm-11:50 am

1 stop26h 35m

$1,035

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

5:40 pm-9:15 am

1 stop31h 35m

Cardiff Wales

Fri 9/19

5:15 pm-4:05 pm

1 stop30h 50m

$1,119

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/13

7:45 am-9:15 am

2 stops17h 30m

Cardiff Wales

Fri 9/19

9:50 am-8:16 pm

2 stops18h 26m

$1,215

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 9/26

8:40 am-5:05 pm

3 stops24h 25m

Cardiff Wales

Fri 10/3

5:15 pm-8:40 pm

3 stops35h 25m

$1,494

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 8/20

7:00 pm-7:30 am

3 stops52h 30m

$521

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 8/20

2:10 pm-4:45 pm

1 stop18h 35m

$594

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Best time to book a flight from Washington to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Cardiff

What is the cheapest time of day to fly from WA to CWL?

Find hourly flight availability from Washington to Cardiff. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

When flying from State of Washington to Cardiff, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Washington to Cardiff. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Cardiff from Washington?

    Located just 9.1 mi from the city center, Cardiff Wales (CWL) is the airport most travelers will use when flying to Cardiff from Washington.

  • Can I find deals for flights from Washington to Cardiff that include hotel bookings?

    Yes. In addition to deals on Washington to Cardiff flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Cardiff?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Cardiff.

  • Can I find deals for business class flights from Washington to Cardiff?

    Yes. Cheapflights offers flight deals from Washington to Cardiff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from State of Washington to Cardiff?

    Currently, February is the cheapest month in which you can book a flight from State of Washington to Cardiff (average of $773). Flying from State of Washington to Cardiff in June is currently the most expensive (average of $1,622). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Barry

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