$757 Cheap Flights from St. Louis (STL) to Iguazu (IGR)

View $757 flight on Tue, Oct 21, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Iguazu (IGR-Cataratas del Iguazu Intl.)

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Cheap Flights from St. Louis to Iguazu (STL-IGR)

Prices were available within the past 7 days and start at $757 for one-way flights and $1,795 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Sep 20 - Thu, Sep 25
STL
St. Louis
IGR
Puerto Iguazú
$1,795 Roundtrip, found 2 days ago
$1,795
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 20 from St. Louis to Puerto Iguazú, returning Thu, Sep 25, priced at $1,795 found 2 days ago
United
Sat, Sep 20 - Mon, Sep 29
STL
St. Louis
IGR
Puerto Iguazú
$1,891 Roundtrip, found 2 days ago
$1,891
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 20 from St. Louis to Puerto Iguazú, returning Mon, Sep 29, priced at $1,891 found 2 days ago
United
Sat, Sep 20 - Sat, Sep 27
STL
St. Louis
IGR
Puerto Iguazú
$1,916 Roundtrip, found 2 days ago
$1,916
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 20 from St. Louis to Puerto Iguazú, returning Sat, Sep 27, priced at $1,916 found 2 days ago
United
Mon, Sep 22 - Thu, Sep 25
STL
St. Louis
IGR
Puerto Iguazú
$2,012 Roundtrip, found 2 days ago
$2,012
Roundtrip
found 2 days ago
Select United flight, departing Mon, Sep 22 from St. Louis to Puerto Iguazú, returning Thu, Sep 25, priced at $2,012 found 2 days ago
United
Sun, Sep 21 - Thu, Sep 25
STL
St. Louis
IGR
Puerto Iguazú
$2,052 Roundtrip, found 2 days ago
$2,052
Roundtrip
found 2 days ago
Select United flight, departing Sun, Sep 21 from St. Louis to Puerto Iguazú, returning Thu, Sep 25, priced at $2,052 found 2 days ago
United
Sat, Sep 20 - Mon, Sep 22
STL
St. Louis
IGR
Puerto Iguazú
$2,141 Roundtrip, found 2 days ago
$2,141
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 20 from St. Louis to Puerto Iguazú, returning Mon, Sep 22, priced at $2,141 found 2 days ago
Air Canada
Sun, Sep 21 - Wed, Sep 24
STL
St. Louis
IGR
Puerto Iguazú
$2,174 Roundtrip, found 2 days ago
$2,174
Roundtrip
found 2 days ago
Select Air Canada flight, departing Sun, Sep 21 from St. Louis to Puerto Iguazú, returning Wed, Sep 24, priced at $2,174 found 2 days ago
United
Sat, Sep 20 - Fri, Sep 26
STL
St. Louis
IGR
Puerto Iguazú
$2,192 Roundtrip, found 2 days ago
$2,192
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 20 from St. Louis to Puerto Iguazú, returning Fri, Sep 26, priced at $2,192 found 2 days ago
United
Sun, Sep 21 - Fri, Sep 26
STL
St. Louis
IGR
Puerto Iguazú
$2,228 Roundtrip, found 2 days ago
$2,228
Roundtrip
found 2 days ago
Select United flight, departing Sun, Sep 21 from St. Louis to Puerto Iguazú, returning Fri, Sep 26, priced at $2,228 found 2 days ago
United
Mon, Sep 22 - Wed, Sep 24
STL
St. Louis
IGR
Puerto Iguazú
$2,358 Roundtrip, found 2 days ago
$2,358
Roundtrip
found 2 days ago
Select United flight, departing Mon, Sep 22 from St. Louis to Puerto Iguazú, returning Wed, Sep 24, priced at $2,358 found 2 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR) cost?
Get a cheap one-way flight from $757 or cheap return flight from $1,795 from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR)?
September is the least expensive month to fly from STL to IGR. Traveling during quieter months is often the key to better flight prices.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from STL to IGR. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR)?
You'll have to catch a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from STL to IGR?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*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 Cataratas del Iguazu Intl. Airport (IGR)?
Book a flight from Lambert-St. Louis Intl. Airport (STL) to Cataratas del Iguazu Intl. Airport (IGR) that leaves before 3 PM to reduce the risk of cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Cataratas del Iguazu Intl. Airport (IGR) last-minute?
Holding off until just before your trip to book your flight from STL to IGR often results in higher prices. While you may find some last-minute deals, there's no guarantee. Keep your travel schedule open to boost your chances of getting a bargain.
Is it cheaper to book a STL to IGR flight and hotel package?
Securing a STL to IGR flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Choose from our impressive range of accommodations and then add activities, car rentals and flights to your booking. Bundle everything 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 Cataratas del Iguazu Intl. Airport (IGR)?
If you reserved your STL to IGR flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Cataratas del Iguazu Intl.
Roundtrip price
$1,794
Distance
5022 mi

Book with confidence

Book with confidence

St. Louis to Iguazu Flights

The cheapest times to fly from St. Louis to Iguazu

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

 

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

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

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 Iguazu 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 St. Louis to Iguazu 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 Iguazu 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 Iguazu Flights

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*Available to One Key members.