$757 Cheap Flights from Newcastle (NTL) to St. Louis (STL)

View $757 flight on Tue, Dec 2, 2025Opens in a new window

Popular airlines from Newcastle, NSW (NTL-Williamtown) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Newcastle to St. Louis (NTL-STL)

Prices were available within the past 7 days and start at $757 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 Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $757 or cheap return flight from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL) 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 Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL)?
Traveling in is a good way to save, as it's the cheapest month for flights between NTL and STL. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll fly you from NTL to STL. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to take a flight with a layover when traveling from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from NTL to STL?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* However, this can vary based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL)?
To land at Lambert-St. Louis Intl. Airport (STL) on schedule, opt for a flight that leaves Williamtown Airport (NTL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from NTL to STL are generally more expensive. To secure the lowest rates, start looking for flights ahead of time. That being said, if you can play around with your travel dates, it's possible to score a cheap ticket right before your trip.
Is it cheaper to book a NTL to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a NTL to STL flight and hotel package with Expedia could result in significant savings. Better still, having everything in one convenient place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of hotels, then tailor your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Williamtown Airport (NTL) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your NTL to STL flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

Travel information

Origin airport
Williamtown
Destination airport
Lambert-St. Louis Intl.
Distance
8991 mi

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Newcastle to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Newcastle 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 Newcastle 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 Newcastle to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $757 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 Newcastle 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 Newcastle 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.

 

Newcastle to St. Louis Flights

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*Available to One Key members.