$403 Cheap Flights from Twin Falls (TWF) to St. Louis (STL)

View $403 flight on Wed, Jan 7, 2026Opens in a new window

Popular airlines from Twin Falls, ID (TWF) to St. Louis Lambert Intl. Airport (STL)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Twin Falls to St. Louis (TWF-STL)

Prices were available within the past 7 days and start at $403 for one-way flights and $487 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Nov 22 - Thu, Nov 27
TWF
Twin Falls
STL
St. Louis
$487 Roundtrip, found 3 days ago
$487
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Nov 22 from Twin Falls to St. Louis, returning Thu, Nov 27, priced at $487 found 3 days ago
Delta
Tue, Nov 18 - Thu, Nov 27
TWF
Twin Falls
STL
St. Louis
$492 Roundtrip, found 3 days ago
$492
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Nov 18 from Twin Falls to St. Louis, returning Thu, Nov 27, priced at $492 found 3 days ago
Delta
Sun, Nov 23 - Thu, Nov 27
TWF
Twin Falls
STL
St. Louis
$518 Roundtrip, found 3 days ago
$518
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Nov 23 from Twin Falls to St. Louis, returning Thu, Nov 27, priced at $518 found 3 days ago
Delta
Sat, Nov 22 - Tue, Dec 2
TWF
Twin Falls
STL
St. Louis
$542 Roundtrip, found 3 days ago
$542
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Nov 22 from Twin Falls to St. Louis, returning Tue, Dec 2, priced at $542 found 3 days ago
Delta
Tue, Nov 18 - Tue, Dec 2
TWF
Twin Falls
STL
St. Louis
$547 Roundtrip, found 3 days ago
$547
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Nov 18 from Twin Falls to St. Louis, returning Tue, Dec 2, priced at $547 found 3 days ago
Delta
Sun, Nov 23 - Tue, Dec 2
TWF
Twin Falls
STL
St. Louis
$573 Roundtrip, found 3 days ago
$573
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Nov 23 from Twin Falls to St. Louis, returning Tue, Dec 2, priced at $573 found 3 days ago
Delta
Sat, Nov 22 - Mon, Dec 1
TWF
Twin Falls
STL
St. Louis
$592 Roundtrip, found 3 days ago
$592
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Nov 22 from Twin Falls to St. Louis, returning Mon, Dec 1, priced at $592 found 3 days ago
Delta
Tue, Nov 18 - Mon, Dec 1
TWF
Twin Falls
STL
St. Louis
$597 Roundtrip, found 3 days ago
$597
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Nov 18 from Twin Falls to St. Louis, returning Mon, Dec 1, priced at $597 found 3 days ago
Delta
Sun, Nov 23 - Mon, Dec 1
TWF
Twin Falls
STL
St. Louis
$623 Roundtrip, found 3 days ago
$623
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Nov 23 from Twin Falls to St. Louis, returning Mon, Dec 1, priced at $623 found 3 days ago
Delta
Sat, Nov 22 - Fri, Nov 28
TWF
Twin Falls
STL
St. Louis
$631 Roundtrip, found 3 days ago
$631
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Nov 22 from Twin Falls to St. Louis, returning Fri, Nov 28, priced at $631 found 3 days ago

Frequently asked questions

How much does a flight from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $403 or cheap return flight from $487 from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from TWF to STL is November, when demand is low. Off-peak season is generally when better flight deals are available between these airports.
What is the cheapest airline that flies from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from TWF to STL. Then, sort your results by "Price (lowest to highest)" to score a good deal.
How many flights per day from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to book a flight with a layover when traveling from Twin Falls Airport (TWF) 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 find an option that works for you.
What day of the week has the most flights from TWF to STL?
Typically you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can change depending on the time of year, 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 Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL) that takes off before 3 PM to reduce the likelihood of delays and 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 Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your trip to book a flight from TWF to STL often results in higher prices. While you might find some last-minute offers, they aren't always guaranteed. Be flexible with your travel plans to maximize your chances of getting a bargain.
Is it cheaper to book a TWF to STL flight and hotel package?
Opting for a TWF to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our extensive range of stays and then add car rentals, activities 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 Twin Falls Airport (TWF) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can modify or cancel your TWF to STL flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you need further information, go to our Customer Service portal.

Travel information

Origin airport
Twin Falls
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$486
Distance
1286 mi

Book with confidence

Twin Falls to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Twin Falls 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 Twin Falls 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 Twin Falls to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $403 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 Twin Falls 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 Twin Falls 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.

 

Twin Falls to St. Louis Flights

Explore a world of travel with Expedia

*Available to One Key members.