Cheap flights from St. Louis to Australia from $636
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Australia departing on 8/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from St. Louis to Australia
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Australia?
The month of August is, on average, the cheapest month to fly to Australia from St. Louis, with most prices found around $1,259. If you aren’t able to travel during the month of August, then book flights to Australia from St. Louis during May instead. Flights to Australia in May, while not as cheap as those in August, still average around $1,383.
What is the cheapest day to depart on your flight to Australia?
The cheapest day to depart from St. Louis to Australia is on a Wednesday. Travelers who choose to depart for Australia on a Wednesday will often find tickets for as low as $1,392. On the other hand, Saturday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,518.
What is the cheapest time of day to depart on your flight to Australia?
Flying to Australia from St. Louis in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,440 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,882 on average. Flights to Australia from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Australia?
You are more likely to see cheaper flights to Australia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,472 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from St. Louis for as low as $1,272 on momondo.
What is the cheapest airline that flies from Lambert-St Louis to Australia?
Air Canada, Qantas Airways, and United Airlines are the most popular carriers operating from Lambert-St Louis to Australia
What airlines fly to Australia?
United Airlines, Qantas Airways and American Airlines are the top three most popular airlines that fly to Australia from St. Louis according to our data. United Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 7 different airlines that fly to Australia on a routine basis, so you have a few additional options to choose from.
Cheap St. Louis to Australia flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Australia
When did momondo last update prices for flights from Lambert-St Louis Airport to Australia?
Prices for flights from Lambert-St Louis Airport to Australia refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Australia?
There are 7 operators available for flights from Lambert-St Louis Airport to Australia as of July 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Australia?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Australia.
What documentation or ID do you need to fly to Australia?
The travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
Best airlines flying from St. Louis to Australia
Compare and see reviews for airlines that fly from St. Louis to Australia with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $687 | Free Cancellation | Rating 7.5 872 reviews | |||
| PriceFrom $912 | Free Cancellation | Rating 7.1 9,678 reviews | |||
| PriceFrom $1,010 | Free Cancellation | Rating 7.4 8,861 reviews | |||
| PriceFrom $1,132 | Free Cancellation | Rating 8.0 202 reviews | |||
| PriceFrom $1,173 | Free Cancellation | Rating 8.0 485 reviews | |||
| PriceFrom $1,193 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $1,449 | Free Cancellation | Rating 7.4 3,588 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Australia?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Australia from St. Louis.
Can I find flights from St. Louis to Australia with flexible booking policies on momondo?
All flight searches from St. Louis to Australia on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from St. Louis to Australia?
Once you have performed a search for St. Louis to Australia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from St. Louis to Australia right now. Can momondo alert me if prices change?
If you are not ready to book a flight from St. Louis to Australia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Australia and let you know when they change.