St. Louis

$146+ 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
nov. 28 — dic. 51
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Cheapflights Tip: The best prices from Riverside to Lambert-St Louis are usually found in April or September, 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 octubre 29, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$165
(Kiwi.com)

One-way from

$146
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$367
Provider with most accurate pricing for Los Angeles-Lambert-St Louis flight deals.
Provider most trusted by Cheapflights users for Los Angeles-Lambert-St Louis flights.
From Riverside to Lambert-St Louis
One-way flight from Riverside to Lambert-St Louis
Highest demand for flights based on searches. 4% potential increase in price ($18 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Average for round-trip flights in October 2025

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 octubre 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
mié. 11/197:00 amLAX - STL
2 stops14h 01mFrontier
jue. 11/203:14 pmSTL - LAX
1 stop8h 16mFrontier
Deal found 10/28$166
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
jue. 12/251:01 pmLAX - STL
1 stop28h 46mFrontier
mié. 12/317:43 pmSTL - LAX
1 stop13h 59mFrontier
Deal found 10/28$167
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/251:01 pmLAX - STL
1 stop28h 46mFrontier
mar. 12/3010:48 amSTL - LAX
1 stop25h 22mFrontier
Deal found 10/29$168
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
mar. 11/116:10 amLAX - STL
2 stops24h 57mMultiple Airlines
sáb. 11/157:45 pmSTL - LAX
1 stop6h 40mMultiple Airlines
Deal found 10/27$172
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/251:01 pmLAX - STL
1 stop28h 46mFrontier
vie. 1/28:42 pmSTL - LAX
1 stop16h 38mFrontier
Deal found 10/29$173
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
lun. 11/179:04 amLAX - STL
2 stops22h 03mMultiple Airlines
jue. 11/203:14 pmSTL - LAX
1 stop8h 16mMultiple Airlines
Deal found 10/27$175
This CheapOair deal was found by Cheapflights users on 10/27. 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.
sáb. 11/82:48 pmLAX - STL
1 stop16h 19mFrontier
mar. 11/117:45 pmSTL - LAX
1 stop6h 40mFrontier
Deal found 10/27$176
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
lun. 11/1712:42 pmLAX - STL
2 stops18h 25mFrontier
jue. 11/207:57 pmSTL - LAX
1 stop6h 12mFrontier
Deal found 10/28$177
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
lun. 11/173:27 pmLAX - STL
2 stops15h 40mFrontier
mar. 11/187:45 pmSTL - LAX
1 stop6h 40mFrontier
Deal found 10/27$178
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
jue. 11/139:04 amLAX - STL
2 stops22h 03mMultiple Airlines
sáb. 11/157:45 pmSTL - LAX
1 stop6h 40mMultiple Airlines
Deal found 10/28$179
This Frontier deal was found by Cheapflights users on 10/27. 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.
vie. 11/79:22 pmLAX - STL
1 stop9h 45mFrontier
lun. 11/1012:09 pmSTL - LAX
1 stop7h 35mFrontier
Deal found 10/27$182
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/166:44 amLAX - STL
1 stop24h 23mFrontier
jue. 11/209:54 pmSTL - LAX
1 stop23h 53mFrontier
Deal found 10/27$183

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 octubre 29, 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

mar. 12/16

1:10 pm-11:10 pm

1 stop8h 00m

Lambert-St Louis

vie. 12/19

6:00 am-8:10 am

Nonstop4h 10m

$320

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

mié. 11/19

7:20 am-6:57 pm

2 stops9h 37m

Lambert-St Louis

dom. 11/23

6:00 am-3:25 pm

2 stops11h 25m

$324

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

sáb. 12/6

7:40 am-5:00 pm

2 stops7h 20m

Lambert-St Louis

sáb. 12/13

1:45 pm-7:15 pm

2 stops7h 30m

$325

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

jue. 12/18

5:00 am-10:40 am

Nonstop3h 40m

Lambert-St Louis

lun. 12/22

6:45 pm-12:10 am

1 stop7h 25m

$335

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

vie. 12/26

5:10 am-10:50 am

Nonstop3h 40m

Lambert-St Louis

mar. 12/30

7:25 pm-12:25 am

1 stop7h 00m

$335

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

lun. 11/24

11:40 pm-8:50 am

1 stop7h 10m

Lambert-St Louis

mié. 11/26

8:30 pm-10:40 pm

Nonstop4h 10m

$335

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

jue. 12/11

12:55 am-10:04 am

1 stop7h 09m

Lambert-St Louis

dom. 12/14

1:35 pm-5:25 pm

1 stop5h 50m

$345

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

jue. 12/25

6:00 am-3:03 pm

1 stop7h 03m

Lambert-St Louis

jue. 1/1

6:05 am-11:07 am

1 stop7h 02m

$345

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

mar. 12/23

5:10 am-10:50 am

Nonstop3h 40m

Lambert-St Louis

jue. 1/1

6:35 pm-8:40 pm

Nonstop4h 05m

$350

Los AngelesSt. Louis

LAX - STL

LAXSTL

Los Angeles

mié. 11/19

11:42 am-12:46 am

2 stops11h 04m

Lambert-St Louis

lun. 11/24

6:00 am-3:25 pm

2 stops11h 25m

$356

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 22 results
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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 October 24, 2025.

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?

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 octubre 29, 2025.

It’s optimal to fly from Riverside to St. Louis in the evening. By choosing this option you can save up to 35% on the cost of your flight, compared to a flight at noon.

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 26, 2025.

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

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 octubre 29, 2025.
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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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.

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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 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 4 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?

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

    For as low as $320, Southwest can have you in St. Louis from Riverside in 8h. 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 $145 on average, our data indicates $442 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
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

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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

Discover the top 6 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 octubre 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$227FlexibilityNo cancel feeOn-time62%
DeltaCheapest$228Average$376FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$257Average$575FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$278Average$413FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$283Average$431FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$292Average$461FlexibilityNo cancel feeOn-time69%

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