$371 Cheap Flights from Billund (BLL) to St. Louis (STL)

View $371 flight on Fri, Aug 15, 2025Opens in a new window

Popular airlines from Billund (BLL) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Billund to St. Louis (BLL-STL)

Prices were available within the past 7 days and start at $371 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Flights from Billund (BLL) to St. Louis (STL)
Origin airport
Billund
Destination airport
Lambert-St. Louis Intl.
Distance
4393 mi

Billund to St. Louis Flights

The cheapest times to fly from Billund 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 Billund to St. Louis are during the month of . You can find some of the cheapest flights from Billund to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Billund 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 Billund 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 Billund to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $371 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 Billund 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 Billund 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.

 

Frequently asked questions

How much does a flight from Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from BLL to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from BLL to STL?
The cheapest flights from BLL to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from BLL to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from BLL to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from BLL to STL?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this are on average 22% more likely to be canceled.**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 Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your trip to book a ticket from BLL to STL generally means paying more. While it's possible to find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to maximize your chances of snagging a bargain.
Is it cheaper to book a BLL to STL flight and hotel package?
Booking a BLL to STL flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our wide range of accommodations 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 Billund Airport (BLL) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you can modify or cancel your BLL to STL flight. However, additional fees may apply, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you want further details, go to our Customer Service portal.

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*Available to One Key members.