$847 Cheap Flights from St. Louis (STL) to Adelaide (ADL)

View $847 flight on Sat, Jan 31, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $847 for one-way flights and $1,292 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fiji Airways
Tue, Nov 11 - Thu, Nov 20
STL
St. Louis
ADL
Adelaide
$1,292 Roundtrip, found 1 hour ago
$1,292
Roundtrip
found 1 hour ago
Select Fiji Airways flight, departing Tue, Nov 11 from St. Louis to Adelaide, returning Thu, Nov 20, priced at $1,292 found 1 hour ago
United
Mon, Oct 27 - Wed, Nov 12
STL
St. Louis
ADL
Adelaide
$1,304 Roundtrip, found 4 days ago
$1,304
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 27 from St. Louis to Adelaide, returning Wed, Nov 12, priced at $1,304 found 4 days ago
Fiji Airways
Tue, Jan 27 - Sat, Feb 14
STL
St. Louis
ADL
Adelaide
$1,344 Roundtrip, found 2 days ago
$1,344
Roundtrip
found 2 days ago
Select Fiji Airways flight, departing Tue, Jan 27 from St. Louis to Adelaide, returning Sat, Feb 14, priced at $1,344 found 2 days ago
United
Mon, Oct 27 - Thu, Nov 13
STL
St. Louis
ADL
Adelaide
$1,354 Roundtrip, found 4 days ago
$1,354
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 27 from St. Louis to Adelaide, returning Thu, Nov 13, priced at $1,354 found 4 days ago
Air New Zealand
Wed, Oct 22 - Thu, Nov 6
STL
St. Louis
ADL
Adelaide
$1,362 Roundtrip, found 4 days ago
$1,362
Roundtrip
found 4 days ago
Select Air New Zealand flight, departing Wed, Oct 22 from St. Louis to Adelaide, returning Thu, Nov 6, priced at $1,362 found 4 days ago
Fiji Airways
Tue, Jan 20 - Thu, Feb 5
STL
St. Louis
ADL
Adelaide
$1,363 Roundtrip, found 2 days ago
$1,363
Roundtrip
found 2 days ago
Select Fiji Airways flight, departing Tue, Jan 20 from St. Louis to Adelaide, returning Thu, Feb 5, priced at $1,363 found 2 days ago
Fiji Airways
Tue, Nov 11 - Sat, Nov 15
STL
St. Louis
ADL
Adelaide
$1,369 Roundtrip, found 1 hour ago
$1,369
Roundtrip
found 1 hour ago
Select Fiji Airways flight, departing Tue, Nov 11 from St. Louis to Adelaide, returning Sat, Nov 15, priced at $1,369 found 1 hour ago
Fiji Airways
Sat, Nov 1 - Sat, Nov 15
STL
St. Louis
ADL
Adelaide
$1,369 Roundtrip, found 4 days ago
$1,369
Roundtrip
found 4 days ago
Select Fiji Airways flight, departing Sat, Nov 1 from St. Louis to Adelaide, returning Sat, Nov 15, priced at $1,369 found 4 days ago
Qantas Airways
Sat, Jan 31 - Wed, Feb 11
STL
St. Louis
ADL
Adelaide
$1,432 Roundtrip, found 14 hours ago
$1,432
Roundtrip
found 14 hours ago
Select Qantas Airways flight, departing Sat, Jan 31 from St. Louis to Adelaide, returning Wed, Feb 11, priced at $1,432 found 14 hours ago
American Airlines
Tue, Nov 11 - Tue, Nov 18
STL
St. Louis
ADL
Adelaide
$1,441 Roundtrip, found 1 hour ago
$1,441
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Tue, Nov 11 from St. Louis to Adelaide, returning Tue, Nov 18, priced at $1,441 found 1 hour ago

Alternative airports near Adelaide

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Adelaide, SA Airport ADL. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $1,626
ADL
Adelaide, SA Airport
CheapestClosest
Average driving time to city center11 min
Flights from $1,626
Flights from St. Louis (STL) to Adelaide (ADL)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Adelaide
Airlines serving
American Airlines, Qantas Airways, Qatar Airways, United
Roundtrip price
$1,291
Distance
9751 mi

St. Louis to Adelaide Flights

The cheapest times to fly from St. Louis to Adelaide

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

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Adelaide: 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 St. Louis to Adelaide

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 St. Louis to Adelaide in 2025. You can also book with separate airlines for your outbound and return journeys, from $847 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 St. Louis to Adelaide 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 St. Louis to Adelaide 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 Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL) cost?
Get a cheap one-way flight from $847 or cheap return flight from $1,292 from Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL)?
Flying in November can help you save, as it's the cheapest month for flights between STL and ADL. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL)?
To find the cheapest airline flying from STL to ADL, use Expedia's filter tool. Tailor your search based on what's important 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 Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to ADL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary based on a range of factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL)?
To arrive at Adelaide Airport (ADL) without delays, opt for a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance 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 Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL) last-minute?
Last-minute fares from STL to ADL are usually more expensive. To secure the cheapest rates, start looking for flights early. That being said, if your travel plans are flexible, you may land a cheap ticket right before your journey.
Is it cheaper to book a STL to ADL flight and hotel package?
Booking a STL to ADL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our impressive range of hotels and then add car rentals, flights and activities 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 Lambert-St. Louis Intl. Airport (STL) to Adelaide Airport (ADL)?
In most instances, you can cancel or modify your STL to ADL flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you need further information, go to our Customer Service portal.

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*Available to One Key members.