$176 Cheap Flights from Sioux City (SUX) to St. Louis (STL)

View $176 flight on Tue, Dec 16, 2025Opens in a new window

Popular airlines from Sioux City, IA (SUX-Sioux Gateway) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Sioux City to St. Louis (SUX-STL)

Prices were available within the past 7 days and start at $176 for one-way flights and $274 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Nov 22 - Mon, Dec 8
SUX
Sioux City
STL
St. Louis
$274 Roundtrip, found 2 days ago
$274
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 22 from Sioux City to St. Louis, returning Mon, Dec 8, priced at $274 found 2 days ago
United
Mon, Oct 13 - Tue, Oct 21
SUX
Sioux City
STL
St. Louis
$279 Roundtrip, found 5 hours ago
$279
Roundtrip
found 5 hours ago
Select United flight, departing Mon, Oct 13 from Sioux City to St. Louis, returning Tue, Oct 21, priced at $279 found 5 hours ago
United
Mon, Oct 13 - Sat, Oct 18
SUX
Sioux City
STL
St. Louis
$284 Roundtrip, found 5 hours ago
$284
Roundtrip
found 5 hours ago
Select United flight, departing Mon, Oct 13 from Sioux City to St. Louis, returning Sat, Oct 18, priced at $284 found 5 hours ago
United
Sun, Dec 14 - Thu, Jan 1
SUX
Sioux City
STL
St. Louis
$294 Roundtrip, found 2 days ago
$294
Roundtrip
found 2 days ago
Select United flight, departing Sun, Dec 14 from Sioux City to St. Louis, returning Thu, Jan 1, priced at $294 found 2 days ago
United
Fri, Oct 3 - Tue, Oct 14
SUX
Sioux City
STL
St. Louis
$299 Roundtrip, found 5 days ago
$299
Roundtrip
found 5 days ago
Select United flight, departing Fri, Oct 3 from Sioux City to St. Louis, returning Tue, Oct 14, priced at $299 found 5 days ago
United
Wed, Oct 15 - Sun, Oct 19
SUX
Sioux City
STL
St. Louis
$302 Roundtrip, found 5 hours ago
$302
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Oct 15 from Sioux City to St. Louis, returning Sun, Oct 19, priced at $302 found 5 hours ago
United
Tue, Nov 4 - Tue, Nov 18
SUX
Sioux City
STL
St. Louis
$311 Roundtrip, found 2 days ago
$311
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 4 from Sioux City to St. Louis, returning Tue, Nov 18, priced at $311 found 2 days ago
United
Fri, Oct 3 - Tue, Oct 7
SUX
Sioux City
STL
St. Louis
$314 Roundtrip, found 5 days ago
$314
Roundtrip
found 5 days ago
Select United flight, departing Fri, Oct 3 from Sioux City to St. Louis, returning Tue, Oct 7, priced at $314 found 5 days ago
United
Thu, Nov 6 - Tue, Nov 18
SUX
Sioux City
STL
St. Louis
$327 Roundtrip, found 2 days ago
$327
Roundtrip
found 2 days ago
Select United flight, departing Thu, Nov 6 from Sioux City to St. Louis, returning Tue, Nov 18, priced at $327 found 2 days ago
United
Sat, Oct 25 - Tue, Oct 28
SUX
Sioux City
STL
St. Louis
$328 Roundtrip, found 4 days ago
$328
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 25 from Sioux City to St. Louis, returning Tue, Oct 28, priced at $328 found 4 days ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $279
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $279

Frequently asked questions

How much does a flight from Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $176 or cheap return flight from $274 from Sioux Gateway Airport (SUX) 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 Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from SUX to STL is November, when demand is low. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from SUX to STL. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL)?
Nonstop flights from Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SUX to STL?
Typically you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* But this can vary based on the season, airline 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 Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of being canceled.**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 Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from SUX to STL right before your journey is generally more expensive. But if there's some wiggle room with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a SUX to STL flight and hotel package?
Opting for a SUX to STL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Choose from our wide range of hotels and then add activities, car rentals and flights 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 Sioux Gateway Airport (SUX) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you can reschedule or cancel your SUX to STL flight. However, additional fees may apply, especially if your booking was made over 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like further information, go to our Customer Service portal.

Travel information

Travel information

Origin airport
Sioux Gateway
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$273
Distance
404 mi

Book with confidence

Book with confidence

Sioux City to St. Louis Flights

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

 

The best time to book a flight from Sioux City to St. Louis

Sunday is one of the best days to book for cheap flights from Sioux City 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 Sioux City 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 Sioux City to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $176 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 Sioux City 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 Sioux City 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.

 

Sioux City to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.