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St. Louis

$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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Riverside to Lambert-St Louis are usually found in August or September, booked 60 days in advance, depart on a Tuesday or Friday 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 July 3, 2025.

Round-trip from

$300
(Mytrip)

One-way from

$136
(Mytrip)

Popular in

December

Cheapest in

August

Average price

$437
From Riverside to Lambert-St Louis
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One-way flight from Riverside to Lambert-St Louis
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Highest demand for flights based on searches. 6% potential increase in price ($29 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 July 2025
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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 July 3, 2025.

This FlightHub deal was found by Cheapflights users on 7/1. 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.
Sat 7/129:28 pmLAX - STL
1 stop14h 06mMultiple Airlines
Fri 7/1810:47 amSTL - LAX
1 stop23h 58mMultiple Airlines
Deal found 7/1$299
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2410:10 pmLAX - STL
1 stop9h 42mSpirit Airlines
Mon 7/2810:47 amSTL - LAX
3 stops35h 29mSpirit Airlines
Deal found 7/1$300
This FlightHub deal was found by Cheapflights users on 7/3. 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.
Tue 7/156:15 amLAX - STL
1 stop24h 56mFrontier
Tue 8/125:40 pmSTL - LAX
1 stop25h 28mFrontier
Deal found 7/3$301
This Southwest deal was found by Cheapflights users on 7/2. 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.
Mon 9/155:20 amLAX - STL
Nonstop3h 35mSouthwest
Tue 9/166:15 amSTL - LAX
1 stop7h 35mSouthwest
Deal found 7/2$306
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:00 pmLAX - STL
1 stop7h 59mAlaska Airlines
Sat 10/183:57 pmSTL - LAX
1 stop8h 50mAlaska Airlines
Deal found 7/1$314
This Delta deal was found by Cheapflights users on 7/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/112:47 amLAX - STL
1 stop5h 47mDelta
Sat 8/95:00 pmSTL - LAX
1 stop7h 36mDelta
Deal found 7/3$315
This American Airlines deal was found by Cheapflights users on 7/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2012:45 amLAX - STL
1 stop9h 05mAmerican Airlines
Mon 8/256:45 amSTL - LAX
Nonstop3h 49mAmerican Airlines
Deal found 7/1$319
This United Airlines deal was found by Cheapflights users on 7/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1312:56 amLAX - STL
1 stop7h 05mUnited Airlines
Wed 9/175:15 amSTL - LAX
1 stop6h 17mUnited Airlines
Deal found 7/3$328

Cheapflights Fare Finder

Customize your flight search to find flights from Riverside to St. Louis 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 3, 2025.
Use the filters below to find and compare flights from Riverside to St. Louis that are best for you.

Fly from

Riverside

Fly to

St. Louis

Route

Depart

Return

Price

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Thu 7/24

10:10 pm-9:52 am

1 stop9h 42m

Lambert-St Louis

Mon 7/28

10:47 am-8:16 pm

3 stops35h 29m

$300

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Tue 7/15

6:15 am-9:11 am

1 stop24h 56m

Lambert-St Louis

Tue 8/12

5:40 pm-5:08 pm

1 stop25h 28m

$301

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Mon 9/15

7:20 pm-12:55 am

Nonstop3h 35m

Lambert-St Louis

Wed 9/17

3:00 pm-7:45 pm

1 stop6h 45m

$306

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Thu 7/24

10:10 pm-9:52 am

1 stop9h 42m

Lambert-St Louis

Sun 7/27

5:15 pm-9:08 am

2 stops17h 53m

$313

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Tue 10/14

12:00 pm-11:59 pm

1 stop9h 59m

Lambert-St Louis

Tue 10/21

6:33 am-1:10 pm

1 stop8h 37m

$314

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Fri 8/1

12:47 am-8:34 am

1 stop5h 47m

Lambert-St Louis

Sat 8/9

5:00 pm-10:36 pm

1 stop7h 36m

$315

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Wed 8/20

12:45 am-11:50 am

1 stop9h 05m

Lambert-St Louis

Mon 8/25

6:45 am-8:34 am

Nonstop3h 49m

$319

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Sat 9/13

12:56 am-10:01 am

1 stop7h 05m

Lambert-St Louis

Wed 9/17

5:15 am-9:32 am

1 stop6h 17m

$328

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Tue 7/29

4:50 pm-10:29 am

2 stops15h 39m

$136

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

Mon 9/29

4:31 pm-9:06 am

2 stops14h 35m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 16 results
1
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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?

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 June 27, 2025.

Booking 60 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, August is the cheapest month in which you can book a flight from Riverside to St. Louis (average of $311). Flying from Riverside to St. Louis in March is currently the most expensive (average of $356). 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?

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 July 3, 2025.

When flying from Riverside to St. Louis, 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 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 June 29, 2025.

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

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated July 3, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Riverside. On average, Lambert-St Louis has 7 inbound flights from Riverside per day from 7 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 18 times in the past calendar month.

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

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $136. Users have also found prices from $137 and $148 on Frontier and Southwest, respectively.

  • 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: Qatar Airways (89%), Southwest (81%), Japan Airlines( 80%).

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

    Looking at all options, your cheapest flight can be booked for $142. While the most popular route (Los Angeles - Lambert-St Louis) can be booked for $131 on average our data indicates $355 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, August is the cheapest month in which you can book a flight from Riverside to St. Louis (average of $311). Flying from Riverside to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near Riverside?

Book flights to Riverside if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

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Top 7 airlines flying from Riverside to St. Louis

Discover the top 7 airlines that operate flights from Riverside to St. Louis. 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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$99Average$287FlexibilityNo cancel feeOn-time65%
FrontierCheapest$126Average$225FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$242Average$432FlexibilityNo cancel feeOn-time71%
DeltaCheapest$296Average$427FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$299Average$448FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$316Average$467FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$327Average$691FlexibilityNo cancel feeOn-time75%

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