Cheap flights from Cardiff to St. Louis

CWL — STL
13 Jul — 20 Jul1
1 adult

Best time to book a flight from Cardiff to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Cardiff with our price prediction graph.
Estimated return 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.

Related info for your journey

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

  • Can I find deals for flights from Cardiff to St. Louis that include hotel bookings?

    Yes. In addition to deals on Cardiff to St. Louis flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to St. Louis?

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

  • Can I find deals for business class flights from Cardiff to St. Louis?

    Yes. Cheapflights offers flight deals from Cardiff to St. Louis 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 Cardiff to St. Louis?

    Currently, February is the cheapest month in which you can book a flight from Cardiff to St. Louis (average of £722). Flying from Cardiff to St. Louis in December is currently the most expensive (average of £1,033). 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.

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Alternative routes for Cardiff to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Manchester to St. Louis flights
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Top airline flying from Cardiff to St. Louis

Discover the top airline that operate flights from Cardiff to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 8 July 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£817Average£931FlexibilityNo cancel feeOn-time75%
Search KLM flights

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How does Cheapflights help users find flights from Cardiff to St. Louis?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to St. Louis from Cardiff today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Cardiff to St. Louis?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Cardiff.

Can Cheapflights find flights from Cardiff to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Cardiff to St. Louis flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Cardiff to St. Louis become cheaper?

Not ready to book yet? You can track prices for flights from Cardiff to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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