HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Riverside

$48+ Cheap flights from St. Louis (STL) to Riverside, CA

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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LAX
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Riverside 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 Lambert-St Louis to Riverside are usually found in September or October, booked 58 days in advance, depart on a Thursday or Wednesday and return on a Friday

Cheap flight deals from St. Louis to Riverside

Cheapest flights from St. Louis to Riverside
Explore the most affordable flight options available from St. Louis to Riverside. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/67:39 pm
STL
-
LAX
1 stop20h 05m
Multiple Airlines
Tue 2/108:20 am
LAX
-
STL
2 stops20h 31m
Multiple Airlines
Deal found 1/28$222
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/168:12 pm
STL
-
LAX
1 stop30h 04m
Frontier
Thu 3/196:15 pm
LAX
-
STL
1 stop15h 04m
Frontier
Deal found 1/27$223
This Expedia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/188:12 pm
STL
-
LAX
1 stop6h 04m
Frontier
Thu 3/261:28 pm
LAX
-
STL
1 stop19h 51m
Frontier
Deal found 1/28$224
This Super.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:49 pm
STL
-
LAX
1 stop29h 12m
Frontier
Wed 3/181:39 pm
LAX
-
STL
1 stop20h 36m
Frontier
Deal found 1/27$225
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/198:06 pm
STL
-
LAX
1 stop22h 27m
Frontier
Tue 3/318:57 pm
LAX
-
STL
1 stop10h 51m
Frontier
Deal found 1/28$226
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
-
LAX
1 stop10h 38m
Multiple Airlines
Sat 2/281:05 am
LAX
-
STL
2 stops27h 46m
Multiple Airlines
Deal found 1/27$227
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2412:14 pm
STL
-
LAX
1 stop26h 25m
Frontier
Mon 3/3010:15 pm
LAX
-
STL
2 stops33h 33m
Frontier
Deal found 1/28$228
This CheapOair deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/510:11 pm
STL
-
LAX
1 stop21h 01m
Frontier
Sat 3/710:40 pm
LAX
-
STL
1 stop29h 22m
Frontier
Deal found 1/27$229
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/87:52 am
STL
-
LAX
2 stops26h 23m
Multiple Airlines
Tue 3/178:57 pm
LAX
-
STL
1 stop10h 52m
Multiple Airlines
Deal found 1/27$230
This Frontier deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:12 pm
STL
-
LAX
1 stop5h 59m
Frontier
Wed 5/1310:07 pm
LAX
-
STL
1 stop10h 23m
Frontier
Deal found 1/28$231
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
-
LAX
1 stop10h 38m
Frontier
Mon 3/210:45 pm
LAX
-
STL
1 stop30h 06m
Frontier
Deal found 1/27$232
This Frontier deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
-
LAX
1 stop11h 39m
Frontier
Sun 3/88:57 pm
LAX
-
STL
1 stop10h 52m
Frontier
Deal found 1/28$233

Find flight deals from St. Louis to Riverside

Keep the following information in mind while searching for St. Louis to Riverside flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$222
(Kiwi.com)

One-way from

$48
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$364
Provider with most accurate pricing for Lambert-St Louis-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Los Angeles flights.
Search Deals
From Lambert-St Louis to Riverside
Search Deals
One-way flight from Lambert-St Louis to Riverside
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($13 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 January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Riverside that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from St. Louis to Riverside that are best for you.

Fly from

St. Louis

Fly to

Riverside

Route

Depart

Return

Price

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 2/17

3:49 pm-9:20 pm

2 stops55h 31m

Los Angeles

Fri 2/27

2:36 pm-1:56 pm

1 stop21h 20m

$251

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 5/2

8:12 pm-8:40 am

1 stop14h 28m

Los Angeles

Mon 5/4

2:17 pm-11:19 pm

2 stops31h 02m

$273

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 3/3

7:00 am-4:35 pm

2 stops11h 35m

Los Angeles

Tue 3/10

11:50 am-12:21 am

2 stops10h 31m

$294

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 3/3

7:00 am-3:36 pm

1 stop10h 36m

Los Angeles

Tue 3/10

5:00 pm-1:51 pm

1 stop18h 51m

$310

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 3/10

6:29 am-2:28 pm

2 stops9h 59m

Los Angeles

Tue 3/17

9:59 am-5:07 pm

1 stop5h 08m

$333

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Wed 3/4

7:00 am-12:26 pm

1 stop7h 26m

Los Angeles

Sat 3/7

9:56 am-9:38 pm

2 stops9h 42m

$333

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Thu 3/5

2:22 pm-10:45 pm

2 stops10h 23m

Los Angeles

Wed 3/11

11:50 am-11:25 pm

2 stops9h 35m

$335

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Thu 3/5

2:22 pm-10:45 pm

2 stops10h 23m

Los Angeles

Sat 3/7

9:56 am-9:38 pm

2 stops9h 42m

$335

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 3/7

7:00 am-4:35 pm

2 stops11h 35m

Los Angeles

Tue 3/10

11:50 am-12:21 am

2 stops10h 31m

$335

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Fri 5/15

9:40 pm-11:45 pm

Nonstop4h 05m

Los Angeles

Wed 6/3

6:20 am-1:50 pm

1 stop5h 30m

$338

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 23 results
1
2
3

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

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

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Riverside. Price data was last updated on January 23, 2026.

To ensure you get the cheapest price possible for a flight from St. Louis to Riverside, you should look to book at least 58 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to Riverside (average of $67). Flying from St. Louis to Riverside in May is currently the most expensive (average of $217). 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 STL to R1V?

Find hourly flight availability from St. Louis to Riverside. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.

Unlike in the morning, when flights are generally more expensive, you can save up to 48% on flights from St. Louis to Riverside by exploring options for tickets in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Riverside. Price data was last updated on January 24, 2026.

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

Weekly flight availability from St. Louis to Riverside

Explore weekly flight availability from St. Louis to Riverside. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 29, 2026.

The most flights from STL to R1V are scheduled on a Monday (9 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).

Reviews of airlines servicing Riverside

Get insights into the airlines that provide service to Riverside. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Riverside. Reviews last updated January 29, 2026.
Read through reviews of airlines operating flights from St. Louis to Riverside, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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.
Delta
7.9
Good
8,128 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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.
United Airlines
7.4
Good
9,215 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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.
American Airlines
7.2
Good
11,205 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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.
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

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.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Riverside. 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 from for flights from St. Louis to Riverside?

    If you book a flight to Riverside from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 8 flights from Lambert-St Louis to Riverside per day from 8 different airlines.

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

    This flight path from Lambert-St Louis to Riverside was viewed by 18 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Airlines like Frontier, Delta, and Alaska Airlines fly from St. Louis to Riverside in about 10h 36m. The time it takes to get you to your destination can typically vary by up to 44h 55m. There are 1588 mi between St. Louis and Riverside. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from St. Louis to Riverside one-way?

    One-way options have recently been found by users for as low as $75 on Frontier. Other airlines that offer cheap prices include American Airlines from $138 and Southwest from $148 one-way.

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

    Consider Malaysia Airlines (82%), Japan Airlines (71%) or Air Tahiti Nui (71%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Riverside.

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

    Looking at all options, your cheapest flight can be booked for $150. While the most popular route (Lambert-St Louis - Los Angeles) can be booked for $135 on average, our data indicates $1,068 when flying from St. Louis to Riverside.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Riverside 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 St. Louis to Riverside?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Riverside (average of $67). Flying from St. Louis to Riverside in May is currently the most expensive (average of $217). 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

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 Riverside

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Las Vegas flights
Kansas City to Las Vegas flights
Kansas City to Los Angeles flights
St. Louis to Los Angeles flights
Kansas City to San Francisco flights
St. Louis to San Francisco flights
St. Louis to San Diego flights
Kansas City to Santa Ana flights
Kansas City to Burbank flights
Kansas City to San Diego flights
Kansas City to Ontario flights
St. Louis to Ontario flights
Kansas City to Sacramento flights
Kansas City to San Jose flights
Kansas City to Oakland flights
Springfield to Los Angeles flights
St. Louis to Sacramento flights
Springfield to Las Vegas flights
Kansas City to Palm Springs flights
St. Louis to Santa Ana flights
St. Louis to San Jose flights
St. Louis to Reno flights
St. Louis to Oakland flights
Springfield to San Diego flights
Springfield to Ontario flights
Columbia to Las Vegas flights
St. Louis to Burbank flights
Kansas City to Reno flights
Kansas City to Monterey flights
St. Louis to Fresno flights
Springfield to San Jose flights
St. Louis to Palm Springs flights
Springfield to San Francisco flights
St. Louis to San Luis Obispo flights
Joplin to Los Angeles flights
Kansas City to Fresno flights
St. Louis to Santa Barbara flights
Columbia to Los Angeles flights
St. Louis to Long Beach flights
Springfield to Santa Ana flights
Kansas City to Long Beach flights
Joplin to Las Vegas flights
Kansas City to Santa Barbara flights
Kansas City to San Luis Obispo flights
St. Louis to Medford flights
Joplin to Santa Ana flights
Kansas City to Medford flights
Columbia to San Francisco flights
Springfield to Palm Springs flights
Springfield to Sacramento flights

Top 8 airlines flying from St. Louis to Riverside

Discover the top 8 airlines that operate flights from St. Louis to Riverside. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$126Average$204FlexibilityNo cancel feeOn-time62%
DeltaCheapest$171Average$358FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$172Average$173FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$263Average$421FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$264Average$388FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$279Average$443FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$296Average$500FlexibilityNo cancel feeOn-time75%
JetBlueCheapest$304Average$360FlexibilityNo cancel feeOn-time62%

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.