How popular is this Riverside to St. Louis flight route?

Flights from Riverside to Lambert-St Louis have been viewed 28 times in the past calendar month.

How long is the flight from Riverside to St. Louis?

For as low as $310, Southwest can have you in St. Louis from Riverside in 3h 40m. The distance between Riverside and St. Louis is about 1588 mi. This flight may include one or multiple stops.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the cheapest flights from Riverside to St. Louis?

Looking at all options, your cheapest flight can be booked for $147. While the most popular route (Los Angeles - Lambert-St Louis) can be booked for $150 on average, our data indicates $443 when flying from Riverside to St. Louis.

What are the most reliable airlines from Riverside to St. Louis?

Before booking your flight to St. Louis from Riverside, check out the most reliable airlines to get you to your destination on time: Sun Country Air (100%), Qantas Airways (86%), Qatar Airways( 85%).

What are the most popular airlines that fly from Riverside to St. Louis?

Before booking your flight from Riverside to St. Louis check out the most popular airlines for this route: Southwest, American Airlines or Frontier.

What airport do you fly into for flights to St. Louis from Riverside?

Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Riverside. On average, Lambert-St Louis has 5 inbound flights from Riverside per day from 6 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

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

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

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

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

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

$136+ Flights from Riverside to St. Louis

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

Find cheap flights from Riverside to St. Louis 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.

Cheapflights Tip: The best prices from Riverside to Lambert-St Louis are usually found in April or October, booked 51 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

Cheap flight deals from Riverside to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$161 (Kiwi.com)
One-way from	$136 (Kiwi.com)
Popular in	December
Cheapest in	April
Average price	$360

Provider with most accurate pricing for Los Angeles-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Los Angeles-Lambert-St Louis flights.

Search Deals

From Riverside to Lambert-St Louis

Search Deals

One-way flight from Riverside to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

Find flight deals from Riverside to St. Louis

Cheapest flights from Riverside to St. Louis
Explore the most affordable flight options available from Riverside to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.

Mon 11/33:27 pmLAX - STL

2 stops15h 40mFrontier

Thu 11/137:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$161

Thu 10/3012:44 pmLAX - STL

1 stop18h 23mFrontier

Mon 11/312:09 pmSTL - LAX

1 stop5h 36mFrontier

Deal found 10/15

$162

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Tue 11/117:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$165

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Sat 11/87:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$166

Sat 11/13:17 pmLAX - STL

1 stop16h 50mFrontier

Tue 11/47:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$169

Fri 11/143:25 pmLAX - STL

1 stop15h 42mFrontier

Thu 11/207:57 pmSTL - LAX

1 stop6h 12mFrontier

Deal found 10/15

$170

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Tue 11/47:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/14

$172

Mon 10/279:17 pmLAX - STL

1 stop9h 50mFrontier

Tue 10/288:40 pmSTL - LAX

1 stop5h 45mFrontier

Deal found 10/14

$173

Mon 10/274:15 pmLAX - STL

2 stops14h 52mMultiple Airlines

Mon 11/37:45 pmSTL - LAX

1 stop19h 33mMultiple Airlines

Deal found 10/14

$174

Thu 10/236:44 amLAX - STL

1 stop24h 23mFrontier

Wed 10/298:40 pmSTL - LAX

1 stop5h 45mFrontier

Deal found 10/15

$175

Tue 11/182:48 pmLAX - STL

1 stop16h 19mFrontier

Thu 11/207:57 pmSTL - LAX

1 stop6h 12mFrontier

Deal found 10/16

$178

Fri 12/58:51 pmLAX - STL

1 stop11h 23mFrontier

Mon 12/87:43 pmSTL - LAX

2 stops16h 56mFrontier

Deal found 10/15

$179

Best flights from Riverside to St. Louis
Discover carefully curated flight deals from Riverside to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 16, 2025.

Fri 11/215:00 amLAX - STL

Nonstop3h 40mSouthwest

Mon 11/245:45 amSTL - LAX

Nonstop4h 10mSouthwest

Deal found 10/16

$310

Sat 11/89:59 amLAX - STL

2 stops9h 24mDelta

Tue 11/116:00 amSTL - LAX

2 stops11h 25mDelta

Deal found 10/15

$334

Tue 11/1811:25 amLAX - STL

1 stop6h 35mSouthwest

Fri 11/215:45 amSTL - LAX

Nonstop4h 10mSouthwest

Deal found 10/15

$320

Sat 11/89:59 amLAX - STL

2 stops9h 24mDelta

Sat 11/155:00 pmSTL - LAX

1 stop7h 57mDelta

Deal found 10/16

$344

Fri 11/1410:35 amLAX - STL

Nonstop3h 35mSouthwest

Fri 11/215:45 amSTL - LAX

Nonstop4h 10mSouthwest

Deal found 10/15

$325

Fri 11/77:35 pmLAX - STL

2 stops11h 16mDelta

Tue 11/116:00 amSTL - LAX

2 stops11h 25mDelta

Deal found 10/15

$344

Tue 11/257:05 amLAX - STL

1 stop6h 45mSouthwest

Wed 11/264:10 pmSTL - LAX

1 stop6h 05mSouthwest

Deal found 10/16

$330

Thu 12/47:40 amLAX - STL

2 stops9h 30mDelta

Sat 12/136:00 amSTL - LAX

1 stop7h 13mDelta

Deal found 10/16

$354

Fri 10/3111:35 amLAX - STL

Nonstop3h 35mSouthwest

Sat 11/11:55 pmSTL - LAX

Nonstop4h 05mSouthwest

Deal found 10/16

$340

Sat 11/15:35 amLAX - STL

Nonstop3h 40mSouthwest

Wed 11/56:35 pmSTL - LAX

Nonstop4h 05mSouthwest

Deal found 10/15

$345

Wed 11/2610:50 amLAX - STL

1 stop5h 25mSouthwest

Wed 11/268:30 pmSTL - LAX

Nonstop4h 10mSouthwest

Deal found 10/16

$355

Last-minute flights from Riverside to St. Louis
Discover last-minute flight deals from Riverside to St. Louis. Data last updated October 16, 2025 and is based on user searches.

Thu 10/236:44 amLAX - STL

1 stop24h 23mFrontier

Wed 10/298:40 pmSTL - LAX

1 stop5h 45mFrontier

Deal found 10/15

$175

Mon 10/279:17 pmLAX - STL

1 stop9h 50mFrontier

Tue 10/288:40 pmSTL - LAX

1 stop5h 45mFrontier

Deal found 10/14

$173

Mon 10/274:15 pmLAX - STL

2 stops14h 52mMultiple Airlines

Mon 11/37:45 pmSTL - LAX

1 stop19h 33mMultiple Airlines

Deal found 10/14

$174

Tue 10/283:27 pmLAX - STL

2 stops15h 40mFrontier

Tue 11/117:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$180

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Tue 11/117:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$165

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Sat 11/87:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$166

Wed 10/297:00 pmLAX - STL

1 stop20h 27mFrontier

Tue 11/47:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/14

$172

Thu 10/3012:44 pmLAX - STL

1 stop18h 23mFrontier

Mon 11/312:09 pmSTL - LAX

1 stop5h 36mFrontier

Deal found 10/15

$162

Sat 11/13:17 pmLAX - STL

1 stop16h 50mFrontier

Tue 11/47:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$169

Mon 11/33:27 pmLAX - STL

2 stops15h 40mFrontier

Mon 11/107:45 pmSTL - LAX

1 stop6h 40mFrontier

Deal found 10/15

$161

Fri 11/143:25 pmLAX - STL

1 stop15h 42mFrontier

Thu 11/207:57 pmSTL - LAX

1 stop6h 12mFrontier

Deal found 10/15

$170

Tue 11/182:48 pmLAX - STL

1 stop16h 19mFrontier

Thu 11/207:57 pmSTL - LAX

1 stop6h 12mFrontier

Deal found 10/16

$178

One-way flights from Riverside to St. Louis
Search for one-way flight options from Riverside to St. Louis. Find affordable one-way fares based on user searches. Data last updated October 16, 2025.

Sun 11/236:44 amLAX - STL

1 stop25h 18mFrontier

Deal found 10/16

$136

Fri 11/218:57 amLAX - STL

1 stop22h 00mSpirit Airlines

Deal found 10/15

$137

Thu 11/275:33 pmLAX - STL

2 stops19h 35mFrontier

Deal found 10/16

$138

Sat 10/251:15 pmLAX - STL

1 stop17h 52mFrontier

Deal found 10/14

$142

Wed 12/176:40 amLAX - STL

2 stops37h 53mFrontier

Deal found 10/16

$143

Tue 12/3012:50 amLAX - STL

1 stop10h 46mAmerican Airlines

Deal found 10/15

$144

Thu 11/209:12 amLAX - STL

2 stops22h 50mFrontier

Deal found 10/16

$145

Mon 12/111:15 pmLAX - STL

1 stop21h 18mFrontier

Deal found 10/15

$147

Wed 1/1411:35 amLAX - STL

Nonstop3h 35mSouthwest

Deal found 10/15

$148

Thu 12/181:01 pmLAX - STL

1 stop28h 46mFrontier

Deal found 10/16

$149

Thu 10/2310:11 pmLAX - STL

2 stops32h 56mFrontier

Deal found 10/16

$150

Wed 11/199:09 amLAX - STL

3 stops22h 49mSpirit Airlines

Deal found 10/15

$151

Cheapflights Fare Finder

Use the filters below to find and compare flights from Riverside to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Fri 11/21

5:00 am-10:40 am

Nonstop3h 40m

Lambert-St Louis

Mon 11/24

5:45 am-7:55 am

Nonstop4h 10m

$310

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Tue 11/18

11:25 am-8:00 pm

1 stop6h 35m

Lambert-St Louis

Fri 11/21

5:45 am-7:55 am

Nonstop4h 10m

$320

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Fri 11/14

10:35 am-4:10 pm

Nonstop3h 35m

Lambert-St Louis

Fri 11/21

5:45 am-7:55 am

Nonstop4h 10m

$325

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Tue 11/25

7:05 am-3:50 pm

1 stop6h 45m

Lambert-St Louis

Wed 11/26

4:10 pm-8:15 pm

1 stop6h 05m

$330

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Sat 11/8

9:59 am-9:23 pm

2 stops9h 24m

Lambert-St Louis

Tue 11/11

6:00 am-3:25 pm

2 stops11h 25m

$334

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Fri 10/31

11:35 am-5:10 pm

Nonstop3h 35m

Lambert-St Louis

Sat 11/1

1:55 pm-4:00 pm

Nonstop4h 05m

$340

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Sat 11/8

9:59 am-9:23 pm

2 stops9h 24m

Lambert-St Louis

Sat 11/15

5:00 pm-10:57 pm

1 stop7h 57m

$344

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Fri 11/7

7:35 pm-8:51 am

2 stops11h 16m

Lambert-St Louis

Tue 11/11

6:00 am-3:25 pm

2 stops11h 25m

$344

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Sat 11/1

5:35 am-11:15 am

Nonstop3h 40m

Lambert-St Louis

Wed 11/5

6:35 pm-8:40 pm

Nonstop4h 05m

$345

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Thu 12/4

7:40 am-7:10 pm

2 stops9h 30m

Lambert-St Louis

Sat 12/13

6:00 am-11:13 am

1 stop7h 13m

$354

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

Showing 1-10 of 19 results

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Riverside 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.

Cheapflights Insights

Everything you need to know about your flight from Riverside to St. Louis

How far ahead should I book a flight from Riverside to St. Louis?

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Riverside to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Riverside to St. Louis?

Currently, September is the cheapest month in which you can book a flight from Riverside to St. Louis (average of $71). Flying from Riverside to St. Louis in March is currently the most expensive (average of $220). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from R1V to STL?

It’s optimal to fly from Riverside to St. Louis in the evening. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Riverside to St. Louis?

Travelers seeking maximum savings on their Riverside to St. Louis flight should consider departing on Monday at noon when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing St. Louis

See what other customers who have flown with Southwest, Delta, and United Airlines from Riverside to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Southwest

8.0

Very good

4,241 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

8.0

Very good

7,984 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

8,982 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

American Airlines

7.2

Good

11,043 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,137 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Related info for your journey

What airport do you fly into for flights to St. Louis from Riverside?
Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Riverside. On average, Lambert-St Louis has 5 inbound flights from Riverside per day from 6 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.
How popular is this Riverside to St. Louis flight route?
Flights from Riverside to Lambert-St Louis have been viewed 28 times in the past calendar month.
How long is the flight from Riverside to St. Louis?
For as low as $310, Southwest can have you in St. Louis from Riverside in 3h 40m. The distance between Riverside and St. Louis is about 1588 mi. This flight may include one or multiple stops.
What are the most reliable airlines from Riverside to St. Louis?
Before booking your flight to St. Louis from Riverside, check out the most reliable airlines to get you to your destination on time: Sun Country Air (100%), Qantas Airways (86%), Qatar Airways( 85%).
What are the cheapest flights from Riverside to St. Louis?
Looking at all options, your cheapest flight can be booked for $147. While the most popular route (Los Angeles - Lambert-St Louis) can be booked for $150 on average, our data indicates $443 when flying from Riverside to St. Louis.
Can I find deals for flights from Riverside to St. Louis that include hotel bookings?
Yes. In addition to deals on Riverside to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Riverside to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Riverside to St. Louis.
Can I find deals for business class flights from Riverside to St. Louis?
Yes. Cheapflights offers flight deals from Riverside to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Riverside to St. Louis?
Currently, September is the cheapest month in which you can book a flight from Riverside to St. Louis (average of $71). Flying from Riverside to St. Louis in March is currently the most expensive (average of $220). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Edwardsville

O'Fallon

Fairview Heights

Maryland Heights

Collinsville

Eureka

Glencoe

St. Peters

Chesterfield

Alton

Farmington

Festus

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Riverside to St. Louis

Los Angeles to Kansas City flights

San Francisco to St. Louis flights

San Francisco to Kansas City flights

Los Angeles to St. Louis flights

Ontario to Kansas City flights

Santa Ana to Kansas City flights

Burbank to Kansas City flights

Las Vegas to Kansas City flights

Ontario to St. Louis flights

Los Angeles to Springfield flights

Las Vegas to St. Louis flights

San Jose to Kansas City flights

Sacramento to Springfield flights

San Diego to Kansas City flights

San Diego to St. Louis flights

Sacramento to St. Louis flights

Burbank to Springfield flights

Santa Ana to Springfield flights

Ontario to Springfield flights

Burbank to St. Louis flights

Sacramento to Kansas City flights

San Jose to St. Louis flights

San Francisco to Springfield flights

Oakland to St. Louis flights

Oakland to Kansas City flights

Long Beach to Kansas City flights

Santa Ana to St. Louis flights

Long Beach to Springfield flights

San Jose to Springfield flights

Fresno to Kansas City flights

Long Beach to St. Louis flights

Monterey to St. Louis flights

San Diego to Springfield flights

Medford to Kansas City flights

Reno to St. Louis flights

Reno to Springfield flights

Palm Springs to Kansas City flights

Los Angeles to Columbia flights

Las Vegas to Springfield flights

Fresno to Springfield flights

Santa Barbara to St. Louis flights

Arcata to Branson flights

Monterey to Kansas City flights

Fresno to St. Louis flights

Ontario to Joplin flights

Santa Barbara to Kansas City flights

San Francisco to Joplin flights

Santa Rosa to Kansas City flights

Los Angeles to Joplin flights

San Jose to Joplin flights

Complete your trip

St. Louis car rentals

Lambert-St Louis Airport car rentals

Springfield Capital Airport car rentals

Belleville Airport car rentals

Marion Williamson County Airport car rentals

Kansas City car rentals

Springfield car rentals

Joplin car rentals

Columbia car rentals

Fort Leonard Wood car rentals

Downtown car rentals

The Hill car rentals

Other flights to St. Louis

Top 6 airlines flying from Riverside to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$121	Average$227	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$248	Average$416	FlexibilityNo cancel fee	On-timeN/A
Alaska Airlines	Cheapest$257	Average$559	FlexibilityNo cancel fee	On-time75%
American Airlines	Cheapest$278	Average$419	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$282	Average$438	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$292	Average$476	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.

$136+ Cheap flights from Riverside, CA to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/23. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Riverside to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Riverside to Lambert-St Louis are usually found in April or October, booked 51 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

Cheap flight deals from Riverside to St. Louis

Keep the following information in mind while searching for Riverside to St. Louis flight deals. Data was last updated October 16, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Riverside to St. Louis

Cheapest flights from Riverside to St. LouisExplore the most affordable flight options available from Riverside to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.

Explore the most affordable flight options available from Riverside to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Riverside to St. Louis that are best for you.

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

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

Cheapflights Insights

Everything you need to know about your flight from Riverside to St. Louis

How far ahead should I book a flight from Riverside to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Riverside to St. Louis. Price data was last updated on October 10, 2025.

What is the cheapest month to book a flight from Riverside to St. Louis?

What is the cheapest time of day to fly from R1V to STL?

Find hourly flight availability from Riverside to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 16, 2025.

What is the cheapest day to fly from Riverside to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Riverside to St. Louis. Price data was last updated on October 12, 2025.

Reviews of airlines servicing St. Louis

See what other customers who have flown with Southwest, Delta, and United Airlines from Riverside to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What airport do you fly into for flights to St. Louis from Riverside?

How popular is this Riverside to St. Louis flight route?

How long is the flight from Riverside to St. Louis?

What are the most reliable airlines from Riverside to St. Louis?

What are the cheapest flights from Riverside to St. Louis?

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

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

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

What is the cheapest month to book a flight from Riverside to St. Louis?

Traveling to a place near St. Louis?

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 Riverside to St. Louis

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

Top 6 airlines flying from Riverside to St. Louis

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Riverside to St. Louis
Explore the most affordable flight options available from Riverside to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.