What is the cheapest airline to fly from St. Louis to Riverton, Wyoming round-trip?

Currently priced at $378, United Airlines will fly you from St. Louis to Riverton, Wyoming and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip.

In terms of precipitation, rainfall in Riverton, Wyoming ranges from 0.2 - 1.9 inches per month. May is typically the wettest month, when rainfall can reach 1.9 in. January is typically the driest time to visit Riverton, Wyoming when rainfall is around 0.2 in.

If weather is an important factor for your trip to Riverton, Wyoming, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

What is the cheapest time of day to fly from STL to RIW?

When flying from St. Louis to Riverton, Wyoming, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from St. Louis to Riverton that include hotel bookings?

Yes. In addition to deals on St. Louis to Riverton flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Riverton?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Riverton.

Can I find deals for business class flights from St. Louis to Riverton?

Yes. Cheapflights offers flight deals from St. Louis to Riverton by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Find Flights from St. Louis to Riverton, WY

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from St. Louis to Riverton with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Best time to book a flight from St. Louis to Riverton

Have a flexible travel schedule? Discover the best time to fly to Riverton from St. Louis with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Riverton

Read through reviews of airlines operating flights from St. Louis to Riverton, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,929 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines

7.4

Good

8,929 reviews

United Airlines

7.4

Good

8,929 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

What is the cheapest airline to fly from St. Louis to Riverton, Wyoming round-trip?
Currently priced at $378, United Airlines will fly you from St. Louis to Riverton, Wyoming and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip.
Can I find deals for flights from St. Louis to Riverton that include hotel bookings?
Yes. In addition to deals on St. Louis to Riverton flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Riverton?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Riverton.
Can I find deals for business class flights from St. Louis to Riverton?
Yes. Cheapflights offers flight deals from St. Louis to Riverton by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for St. Louis to Riverton

Top airline flying from St. Louis to Riverton

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$378	Average$478	FlexibilityNo cancel fee	On-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Find cheap flights from St. Louis to Riverton with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Best time to book a flight from St. Louis to Riverton

Have a flexible travel schedule? Discover the best time to fly to Riverton from St. Louis with our price prediction graph.

Reviews of airlines servicing Riverton

Read through reviews of airlines operating flights from St. Louis to Riverton, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Riverton. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What is the cheapest airline to fly from St. Louis to Riverton, Wyoming round-trip?

Can I find deals for flights from St. Louis to Riverton that include hotel bookings?

How can I find direct flights from St. Louis to Riverton?

Can I find deals for business class flights from St. Louis to Riverton?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Riverton

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Riverton by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Riverton by cabin class

Find flights from St. Louis to Riverton, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Riverton flights

Browse other St. Louis and Riverton flight options. Last updated on September 15, 2025.

Other flights from St. Louis

Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2025.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2025

Other flights to Riverton

Explore flights to Riverton departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2025.

Top airline flying from St. Louis to Riverton

100% Free

Book with Flexibility

Travel Smart

Cheap flights from St. Louis to Riverton, WY (STL - RIW)

Find cheap flights from St. Louis to Riverton with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Best time to book a flight from St. Louis to Riverton

Have a flexible travel schedule? Discover the best time to fly to Riverton from St. Louis with our price prediction graph.

Reviews of airlines servicing Riverton

Read through reviews of airlines operating flights from St. Louis to Riverton, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Riverton. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What is the cheapest airline to fly from St. Louis to Riverton, Wyoming round-trip?

Can I find deals for flights from St. Louis to Riverton that include hotel bookings?

How can I find direct flights from St. Louis to Riverton?

Can I find deals for business class flights from St. Louis to Riverton?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Riverton

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from St. Louis to Riverton

100% Free

Book with Flexibility

Travel Smart