$710 Cheap Flights from St. Louis (STL) to Adelaide (ADL)

View $710 flight on Tue, Nov 4, 2025Opens 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 $710 for one-way flights and $1,287 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Mar 5 - Mon, Mar 16
STL
St. Louis
ADL
Adelaide
$1,287 Roundtrip, found 4 days ago
$1,287
Roundtrip
found 4 days ago
Select United flight, departing Thu, Mar 5 from St. Louis to Adelaide, returning Mon, Mar 16, priced at $1,287 found 4 days ago
United
Mon, Feb 16 - Mon, Mar 2
STL
St. Louis
ADL
Adelaide
$1,292 Roundtrip, found 4 days ago
$1,292
Roundtrip
found 4 days ago
Select United flight, departing Mon, Feb 16 from St. Louis to Adelaide, returning Mon, Mar 2, priced at $1,292 found 4 days ago
United
Thu, Feb 26 - Wed, Mar 11
STL
St. Louis
ADL
Adelaide
$1,292 Roundtrip, found 5 days ago
$1,292
Roundtrip
found 5 days ago
Select United flight, departing Thu, Feb 26 from St. Louis to Adelaide, returning Wed, Mar 11, priced at $1,292 found 5 days ago
United
Mon, Feb 2 - Mon, Feb 16
STL
St. Louis
ADL
Adelaide
$1,298 Roundtrip, found 4 days ago
$1,298
Roundtrip
found 4 days ago
Select United flight, departing Mon, Feb 2 from St. Louis to Adelaide, returning Mon, Feb 16, priced at $1,298 found 4 days ago
Air Canada
Sun, Mar 15 - Fri, Apr 3
STL
St. Louis
ADL
Adelaide
$1,299 Roundtrip, found 4 days ago
$1,299
Roundtrip
found 4 days ago
Select Air Canada flight, departing Sun, Mar 15 from St. Louis to Adelaide, returning Fri, Apr 3, priced at $1,299 found 4 days ago
United
Fri, Mar 6 - Mon, Mar 16
STL
St. Louis
ADL
Adelaide
$1,305 Roundtrip, found 4 days ago
$1,305
Roundtrip
found 4 days ago
Select United flight, departing Fri, Mar 6 from St. Louis to Adelaide, returning Mon, Mar 16, priced at $1,305 found 4 days ago
United
Wed, Feb 25 - Wed, Mar 11
STL
St. Louis
ADL
Adelaide
$1,308 Roundtrip, found 4 days ago
$1,308
Roundtrip
found 4 days ago
Select United flight, departing Wed, Feb 25 from St. Louis to Adelaide, returning Wed, Mar 11, priced at $1,308 found 4 days ago
Fiji Airways
Tue, Feb 17 - Sat, Mar 7
STL
St. Louis
ADL
Adelaide
$1,354 Roundtrip, found 4 days ago
$1,354
Roundtrip
found 4 days ago
Select Fiji Airways flight, departing Tue, Feb 17 from St. Louis to Adelaide, returning Sat, Mar 7, priced at $1,354 found 4 days ago
Air New Zealand
Mon, Dec 1 - Sun, Dec 14
STL
St. Louis
ADL
Adelaide
$1,363 Roundtrip, found 5 days ago
$1,363
Roundtrip
found 5 days ago
Select Air New Zealand flight, departing Mon, Dec 1 from St. Louis to Adelaide, returning Sun, Dec 14, priced at $1,363 found 5 days ago
Cathay Pacific
Tue, Mar 10 - Wed, Mar 25
STL
St. Louis
ADL
Adelaide
$1,447 Roundtrip, found 4 days ago
$1,447
Roundtrip
found 4 days ago
Select Cathay Pacific flight, departing Tue, Mar 10 from St. Louis to Adelaide, returning Wed, Mar 25, priced at $1,447 found 4 days 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 $2,003
ADL
Adelaide, SA Airport
CheapestClosest
Average driving time to city center11 min
Flights from $2,003

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 $710 or cheap return flight from $1,287 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 March 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.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Adelaide
Airlines serving
Air New Zealand, American Airlines, Cathay Pacific, Qantas Airways, Qatar Airways, United
Roundtrip price
$1,287
Distance
9751 mi

Book with confidence

Book with confidence

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 March. 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 $710 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.

 

St. Louis to Adelaide Flights

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