$700 Cheap Flights from Cardiff (CWL) to St. Louis (STL)

View $700 flight on Mon, Apr 27, 2026Opens in a new window

Popular airlines from Cardiff International Airport (CWL) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Cardiff to St. Louis (CWL-STL)

Prices were available within the past 7 days and start at $700 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $700 or cheap return flight from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from CWL to STL is , when demand is low. Off-peak season is usually when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from CWL to STL, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights available from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from CWL to STL?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary depending on a range of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Later flights have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until right before your break to book your flight from CWL to STL often results in higher prices. While you might find some last-minute offers, there's no guarantee. Keep your travel schedule open to boost your chances of scoring a bargain.
Is it cheaper to book a CWL to STL flight and hotel package?
Opting for a CWL to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our wide range of stays and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cardiff Intl. Airport (CWL) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you're able to cancel or reschedule your CWL to STL flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like further details, visit our Customer Service portal.

Travel information

Origin airport
Cardiff Intl.
Destination airport
Lambert-St. Louis Intl.
Distance
4079 mi

Book with confidence

Cardiff to St. Louis Flights

The cheapest times to fly from Cardiff to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Cardiff to St. Louis are during the month of . You can find some of the cheapest flights from Cardiff to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Cardiff to St. Louis

Sunday is one of the best days to book for cheap flights from Cardiff to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Cardiff to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Cardiff to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $700 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Cardiff to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Cardiff to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Cardiff to St. Louis Flights

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*Available to One Key members.