$734 Cheap Flights from Adelaide (ADL) to St. Louis (STL)

View $734 flight on Mon, Jan 19, 2026Opens in a new window

Popular airlines from Adelaide, SA Airport (ADL) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Adelaide to St. Louis (ADL-STL)

Prices were available within the past 7 days and start at $734 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 Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $734 or cheap return flight from Adelaide Airport (ADL) 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 Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL)?
Traveling in is a great way to save, as it's the cheapest month for flights between ADL and STL. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest ADL to STL flight.
How many flights per day from Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily nonstop flights from Adelaide Airport (ADL) 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 cruising above the clouds in no time.
What day of the week has the most flights from ADL to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL)?
To land at Lambert-St. Louis Intl. Airport (STL) on schedule, choose a flight that leaves from Adelaide Airport (ADL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from ADL to STL right before your journey is generally more expensive. However, if there's some wiggle room with your itinerary, you could bag a cheap last-minute fare.
Is it cheaper to book an ADL to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking an ADL to STL flight and hotel package with Expedia could result in significant savings. Better still, managing everything in one place takes the hassle out of planning your trip. Just pick your flights and select from our wide range of stays, then tailor your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Adelaide Airport (ADL) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you're able to cancel or reschedule your ADL to STL flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you need further details, visit our Customer Service portal.

Travel information

Origin airport
Adelaide
Destination airport
Lambert-St. Louis Intl.
Distance
9751 mi

Book with confidence

Adelaide to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Adelaide 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 Adelaide 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 Adelaide to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $734 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 Adelaide 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 Adelaide 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.

 

Adelaide to St. Louis Flights

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*Available to One Key members.