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Cheap flights from Cardiff to St. Louis

CWL — STL
18 Oct — 25 Oct1
1 adult
1 adult, Economy

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.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 18 September 2025.
Read reviews from past customers who have flown with KLM from Cardiff to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,386 reviews
Check prices

Comfort

7.7

Entertainment

7.2

Food

7.3

Overall

7.8

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,386 reviews
KLM
7.8
Good
1,386 reviews
Check prices

Comfort

7.7

Entertainment

7.2

Food

7.3

Overall

7.8

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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.

  • What is the cheapest airline to fly from Cardiff to St. Louis round-trip?

    Currently priced at £816, KLM will fly you from Cardiff to St. Louis and back. In addition to KLM, many other airlines offer competitively priced options for your trip.

  • 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.
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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 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£816Average£918FlexibilityNo cancel feeOn-time75%
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