Cheap Flights from St. Louis (SUS) to Niagara Falls (IAG)

Popular airlines from St. Louis, MO (SUS-Spirit of St. Louis) to Niagara Falls, NY (IAG-Niagara Falls Intl.)

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Frequently asked questions

How much does a flight from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG) cost?
Get a cheap one-way flight or cheap return flight from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG) 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 Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG)?
Planning your getaway for is a great way to save, as it's the cheapest month for flights between SUS and IAG. You'll often find the lowest fares during off-peak months.
What is the cheapest airline that flies from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from SUS to IAG. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG)?
There are no daily direct flights from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from SUS to IAG?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change depending on various factors, such as the season 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 Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG)?
To avoid potential delays on the Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG) route, fly before 3 PM. Flights after this time have a 22% higher chance of cancellation.**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 Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG) last-minute?
Booking your ticket from SUS to IAG just before your trip is generally more expensive. However, if you're flexible with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a SUS to IAG flight and hotel package?
You'll typically save money by securing a SUS to IAG flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. Once you've selected your preferred accommodations and flights, you can add extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Spirit of St. Louis Airport (SUS) to Niagara Falls Intl. Airport (IAG)?
If you reserved your SUS to IAG flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

Travel information

Origin airport
Spirit of St. Louis
Destination airport
Niagara Falls Intl.
Distance
682 mi

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St. Louis to Niagara Falls Flights

The cheapest times to fly from St. Louis to Niagara Falls

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

 

The best time to book a flight from St. Louis to Niagara Falls

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

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 Niagara Falls in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Niagara Falls 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 Niagara Falls 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 Niagara Falls Flights

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