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Riverside

$93+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LAX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Riverside are usually found in September or January, booked 57 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap 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 September 11, 2025.

Round-trip from

$173
(Kiwi.com)

One-way from

$93
(Frontier)

Popular in

March

Cheapest in

September

Average price

$308
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. 4% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Wed 10/157:52 pmSTL - LAX
1 stop6h 33mFrontier
Mon 10/209:17 pmLAX - STL
1 stop9h 50mFrontier
Deal found 9/9$173
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/139:59 pmSTL - LAX
1 stop25h 26mMultiple Airlines
Sat 10/185:19 pmLAX - STL
1 stop14h 03mMultiple Airlines
Deal found 9/9$174
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 11/147:45 pmSTL - LAX
1 stop19h 33mMultiple Airlines
Sun 11/165:18 pmLAX - STL
2 stops13h 49mMultiple Airlines
Deal found 9/9$176
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/147:52 pmSTL - LAX
1 stop6h 33mFrontier
Mon 10/209:17 pmLAX - STL
1 stop9h 50mFrontier
Deal found 9/9$178
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Sat 11/154:51 pmSTL - LAX
1 stop17h 26mMultiple Airlines
Tue 11/185:18 pmLAX - STL
2 stops13h 49mMultiple Airlines
Deal found 9/9$179
This Southwest deal was found by Cheapflights users on 9/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/82:45 pmSTL - LAX
1 stop6h 20mSouthwest
Wed 10/156:30 pmLAX - STL
Nonstop3h 40mSouthwest
Deal found 9/8$180
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/77:52 pmSTL - LAX
1 stop6h 33mFrontier
Sat 10/114:52 pmLAX - STL
2 stops38h 15mFrontier
Deal found 9/9$181
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/237:52 pmSTL - LAX
1 stop13h 43mMultiple Airlines
Sat 10/2512:53 amLAX - STL
1 stop6h 29mMultiple Airlines
Deal found 9/10$182
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 11/137:45 pmSTL - LAX
1 stop6h 40mMultiple Airlines
Tue 11/185:18 pmLAX - STL
2 stops13h 49mMultiple Airlines
Deal found 9/9$183
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/27:55 pmSTL - LAX
1 stop6h 32mMultiple Airlines
Sat 10/412:53 amLAX - STL
1 stop7h 01mMultiple Airlines
Deal found 9/10$184
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/176:05 pmSTL - LAX
1 stop16h 23mFrontier
Mon 10/276:57 pmLAX - STL
2 stops36h 10mFrontier
Deal found 9/10$185
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 11/147:45 pmSTL - LAX
1 stop19h 33mFrontier
Tue 11/183:27 pmLAX - STL
2 stops15h 40mFrontier
Deal found 9/11$186

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 September 11, 2025.
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

Sat 10/25

8:25 am-10:30 am

Nonstop4h 05m

Los Angeles

Thu 10/30

5:30 am-11:10 am

Nonstop3h 40m

$213

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Wed 10/15

8:15 pm-10:20 pm

Nonstop4h 05m

Los Angeles

Fri 10/17

5:25 pm-11:05 pm

Nonstop3h 40m

$215

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Thu 11/20

1:50 pm-6:40 pm

1 stop6h 50m

Los Angeles

Wed 12/3

8:45 am-5:15 pm

2 stops6h 30m

$220

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 11/11

6:35 pm-8:40 pm

Nonstop4h 05m

Los Angeles

Wed 11/26

5:10 am-10:50 am

Nonstop3h 40m

$229

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Mon 10/13

9:25 pm-11:25 pm

Nonstop4h 00m

Los Angeles

Wed 10/15

5:30 am-11:10 am

Nonstop3h 40m

$238

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 10/18

1:45 pm-7:20 pm

2 stops7h 35m

Los Angeles

Sat 10/25

11:00 pm-8:05 am

1 stop7h 05m

$238

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Wed 1/7

10:15 am-5:05 pm

2 stops8h 50m

$97

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 1/20

11:55 am-5:00 pm

1 stop7h 05m

$99

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 1/6

10:25 am-12:45 pm

Nonstop4h 20m

$104

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 10/18

1:55 pm-4:00 pm

Nonstop4h 05m

$104

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 14 results
1
2

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 August 29, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Riverside, you should look to book at least 57 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, January is the cheapest month in which you can book a flight from St. Louis to Riverside (average of $246). Flying from St. Louis to Riverside in March is currently the most expensive (average of $325). 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 September 11, 2025.

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

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 September 7, 2025.

Travelers seeking maximum savings on their St. Louis to Riverside flight should consider departing on Saturday 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.

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 September 11, 2025.

The most flights from STL to R1V are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 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 September 11, 2025.
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
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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 7 flights from Lambert-St Louis to Riverside per day from 7 different airlines.

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

    This flight path from Lambert-St Louis to Riverside was viewed by 13 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 Southwest fly from St. Louis to Riverside in about 4h 05m. The time it takes to get you to your destination is usually consistent. There are 1588 mi between St. Louis and Riverside. Generally, flights for this route are nonstop.

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

    Consider Alaska Airlines (95%), Japan Airlines (90%) or Air Tahiti Nui (90%) 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 $139. While the most popular route (Lambert-St Louis - Los Angeles) can be booked for $138 on average, our data indicates $689 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, January is the cheapest month in which you can book a flight from St. Louis to Riverside (average of $246). Flying from St. Louis to Riverside in March is currently the most expensive (average of $325). 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

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Top 7 airlines flying from St. Louis to Riverside

Discover the top 7 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$227FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$173FlexibilityNo cancel feeOn-time65%
DeltaCheapest$181Average$389FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$264Average$410FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$275Average$425FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$296Average$547FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$296Average$435FlexibilityNo cancel feeOn-time69%

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