How long is the flight from Cardiff to St. Louis?

For as low as £730, KLM can have you in St. Louis from Cardiff in 36h 26m. The distance between Cardiff and St. Louis is about 4077 mi.

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Cardiff to St. Louis as you normally would.

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.

£730+ Cheap Flights from Cardiff to St. Louis

Cheap flight deals from Cardiff to St. Louis

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Cheapest flights from Cardiff to St. Louis
Explore the most affordable flight options available from Cardiff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Sun 15/1117:30 -

2 stops36h 26m

Sun 22/1119:18 -

2 stops32h 27m

Deal found 1/10£730

Tue 15/1210:20 -

2 stops19h 45m

Wed 6/115:40 -

2 stops19h 20m

Deal found 1/10£837

Sun 15/1109:00 -

3 stops20h 55m

Sun 22/1118:21 -

3 stops35h 24m

Deal found 1/10£1,031

Find flight deals from Cardiff to St. Louis

Round-trip from	£730

KLM
15/11-22/11
4 total stops
68h 53m total
Cardiff to St. Louis

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Cheapest return flight

CardiffSt. Louis

CWL Cardiff Wales - STL Lambert-St Louis

CWLSTL

Cardiff Wales

Sun 15/11

17:30-23:56

2 stops36h 26m

Lambert-St Louis

Sun 22/11

19:18-09:45

2 stops32h 27m

£730

CardiffSt. Louis

CWL Cardiff Wales - STL Lambert-St Louis

CWLSTL

Cardiff Wales

Tue 15/12

12:15-09:29

3 stops27h 14m

Lambert-St Louis

Wed 6/1

17:49-08:30

3 stops32h 41m

£1,130

Fastest return journey

CardiffSt. Louis

CWL Cardiff Wales - STL Lambert-St Louis

CWLSTL

Cardiff Wales

Sun 15/11

14:25-18:17

3 stops33h 52m

Lambert-St Louis

Sun 22/11

11:14-08:10

2 stops14h 56m

£1,237

Flights are sorted by cheapest return flights first.

Deals found on 1/10

Sorted by cheapest first

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.

CWL-STL

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

How long is the flight from Cardiff to St. Louis?
For as low as £730, KLM can have you in St. Louis from Cardiff in 36h 26m. The distance between Cardiff and St. Louis is about 4077 mi.
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.

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Cheap flights from Cardiff to St. Louis from £730

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Cardiff to St. Louis

Cheapest flights from Cardiff to St. LouisExplore the most affordable flight options available from Cardiff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Explore the most affordable flight options available from Cardiff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Best flights from Cardiff to St. LouisDiscover carefully curated flight deals from Cardiff to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Discover carefully curated flight deals from Cardiff to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Last-minute flights from Cardiff to St. LouisDiscover last-minute flight deals from Cardiff to St. Louis. Data last updated 5 October 2026 and is based on user searches.

Discover last-minute flight deals from Cardiff to St. Louis. Data last updated 5 October 2026 and is based on user searches.

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

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Related info for your journey

How long is the flight from Cardiff to St. Louis?

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

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

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Cardiff to St. Louis

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Cardiff and St. Louis flights

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Cheapest flights from Cardiff to St. Louis
Explore the most affordable flight options available from Cardiff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Best flights from Cardiff to St. Louis
Discover carefully curated flight deals from Cardiff to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Last-minute flights from Cardiff to St. Louis
Discover last-minute flight deals from Cardiff to St. Louis. Data last updated 5 October 2026 and is based on user searches.