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Riverside

$108+ 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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LAX
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Riverside are usually found in September or August, 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 July 29, 2025.

Round-trip from

$193
(FlightHub)

One-way from

$108
(Frontier)

Popular in

March

Cheapest in

September

Average price

$395
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 ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 29, 2025.

This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:05 pmSTL - LAX
1 stop13h 10mSpirit Airlines
Sat 9/205:30 amLAX - STL
1 stop27h 20mSpirit Airlines
Deal found 7/27$193
This CheapOair deal was found by Cheapflights users on 7/29. 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 9/412:05 pmSTL - LAX
1 stop13h 10mMultiple Airlines
Sun 9/78:03 pmLAX - STL
1 stop15h 50mMultiple Airlines
Deal found 7/29$196
This Frontier deal was found by Cheapflights users on 7/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/307:55 pmSTL - LAX
1 stop6h 32mFrontier
Sat 10/119:31 pmLAX - STL
1 stop10h 36mFrontier
Deal found 7/27$218

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 July 29, 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

Thu 9/4

12:05 pm-11:15 pm

1 stop13h 10m

Los Angeles

Sat 9/20

5:30 am-10:50 am

1 stop27h 20m

$193

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Thu 9/4

12:05 pm-11:15 pm

1 stop13h 10m

Los Angeles

Sun 9/7

8:03 pm-1:53 pm

1 stop15h 50m

$196

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 9/30

7:55 pm-12:27 am

1 stop6h 32m

Los Angeles

Sat 10/11

9:31 pm-10:07 am

1 stop10h 36m

$218

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 10/28

7:52 pm-12:25 am

1 stop6h 33m

$108

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Mon 8/18

2:30 pm-11:09 pm

1 stop10h 39m

$110

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 8/16

2:52 pm-11:58 pm

2 stops11h 06m

$126

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 10/14

7:35 am-9:40 am

Nonstop4h 05m

$148

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Tue 12/9

7:00 am-2:40 pm

1 stop9h 40m

$151

St. LouisLos Angeles

STL - LAX

STLLAX

Lambert-St Louis

Sat 11/8

7:00 am-9:25 am

Nonstop4h 25m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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 July 25, 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 $326). 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 July 29, 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 July 27, 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. Tuesday 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 July 29, 2025.

The most flights from STL to R1V are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, 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 July 29, 2025.
Read through reviews of airlines operating flights from St. Louis to Riverside, such as Southwest, Hawaiian Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.8
Good
2,605 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Spirit Airlines
6.3
Okay
8,040 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Frontier
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 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 12 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $108 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $110 and Southwest from $148 one-way.

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

    Consider American Airlines (82%), Alaska Airlines (82%) or SkyWest Airlines (80%) 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 $147. While the most popular route (Lambert-St Louis - Los Angeles) can be booked for $179 on average our data indicates $714 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 $326). 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$56Average$173FlexibilityNo cancel feeOn-time65%
FrontierCheapest$94Average$224FlexibilityNo cancel feeOn-time62%
DeltaCheapest$181Average$390FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$249Average$414FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$259Average$431FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$281Average$431FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$296Average$547FlexibilityNo cancel feeOn-time75%

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