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$571+ Cheap flights from Billund (BLL) to St. Louis (STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
BLL — STL
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Billund to St. Louis

Cheapest flights from Billund to St. Louis
Explore the most affordable flight options available from Billund to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2810:35 am
BLL
-
STL
2 stops18h 39m
United Airlines
Wed 3/411:25 am
STL
-
BLL
2 stops19h 00m
United Airlines
Deal found 1/26$571

Find flight deals from Billund to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Billund (BLL) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 29, 2026.

Round-trip from

$571
(United Airlines)

Popular in

July

Cheapest in

March

Average price

$685
From Billund to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($148 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Billund to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Billund to St. Louis that are best for you.

Fly from

Billund

Fly to

St. Louis

Route

Depart

Return

Price

BillundSt. Louis

BLL - STL

BLLSTL

Billund

Sat 2/28

10:35 am-10:14 pm

2 stops18h 39m

Lambert-St Louis

Wed 3/4

11:25 am-1:25 pm

2 stops19h 00m

$571

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Billund with our price prediction graph.
Estimated round-trip 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.

Cheapflights Insights

Everything you need to know about your flight from Billund to St. Louis

What is the cheapest month to book a flight from Billund to St. Louis?

Currently, March is the cheapest month in which you can book a flight from Billund to St. Louis (average of $361). Flying from Billund to St. Louis in May is currently the most expensive (average of $708). 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.

How much does it cost to fly round-trip from Billund to St. Louis?

Related info for your journey

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

  • How long is the flight from Billund to St. Louis?

    For as low as $571, United Airlines can have you in St. Louis from Billund in 18h 39m. Airlines will cover a distance of 4391 mi.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Billund to St. Louis (average of $361). Flying from Billund to St. Louis in May is currently the most expensive (average of $708). 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.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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