$148+ 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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
Dec 6 — Dec 131
1 adult, Economy
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Find cheap flights from Riverside to St. Louis 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 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 November 6, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $169 (Kiwi.com) |
One-way from | $148 (Southwest) |
Popular in | December |
Cheapest in | April |
Average price | $406 |
Find flight deals from Riverside to St. Louis
Cheapest flights from Riverside to St. LouisExplore 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 November 6, 2025.
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 November 6, 2025.
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/91:42 pmLAX - STL
2 stops43h 25mFrontier
Fri 12/121:16 pmSTL - LAX
1 stop8h 49mFrontier
Deal found 11/4![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/299:15 amLAX - STL
1 stop8h 52mFrontier
Sun 1/410:10 pmSTL - LAX
1 stop24h 21mFrontier
Deal found 11/4![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/197:00 amLAX - STL
2 stops14h 01mFrontier
Fri 11/217:43 pmSTL - LAX
1 stop15h 53mFrontier
Deal found 11/4![Frontier logo]()
$175
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:00 amLAX - STL
1 stop24h 07mFrontier
Tue 11/187:45 pmSTL - LAX
1 stop19h 33mFrontier
Deal found 11/3![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/61:07 pmLAX - STL
2 stops17h 52mFrontier
Sun 12/79:14 pmSTL - LAX
1 stop24h 51mFrontier
Deal found 11/4![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/58:51 pmLAX - STL
1 stop11h 23mFrontier
Sat 12/67:43 pmSTL - LAX
2 stops16h 20mFrontier
Deal found 11/4![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/229:15 amLAX - STL
1 stop8h 52mFrontier
Sun 1/410:10 pmSTL - LAX
1 stop16h 06mFrontier
Deal found 11/4![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/236:53 pmLAX - STL
1 stop18h 15mFrontier
Mon 12/87:43 pmSTL - LAX
1 stop6h 46mFrontier
Deal found 11/4![Frontier logo]()
$182
This Frontier deal was found by Cheapflights users on 11/6. 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.
Wed 11/191:23 pmLAX - STL
1 stop7h 38mFrontier
Mon 11/247:43 pmSTL - LAX
1 stop6h 26mFrontier
Deal found 11/6![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/118:47 pmLAX - STL
1 stop12h 35mFrontier
Sat 12/137:43 pmSTL - LAX
2 stops16h 20mFrontier
Deal found 11/4![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/189:20 pmLAX - STL
2 stops10h 42mMultiple Airlines
Sun 12/214:27 pmSTL - LAX
1 stop27h 36mMultiple Airlines
Deal found 11/4![Multiple Airlines logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 11/182:48 pmLAX - STL
1 stop16h 19mFrontier
Wed 11/197:45 pmSTL - LAX
1 stop6h 40mFrontier
Deal found 11/6![Frontier logo]()
$188
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 November 6, 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
Mon 1/26
1:10 pm-10:00 pm
1 stop6h 50m
Lambert-St Louis
Thu 1/29
11:20 am-5:20 pm
1 stop8h 00m
$263
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 1/7
11:35 am-5:10 pm
Nonstop3h 35m
Lambert-St Louis
Tue 2/10
10:25 am-12:45 pm
Nonstop4h 20m
$295
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 12/13
7:10 am-12:45 pm
Nonstop3h 35m
Lambert-St Louis
Tue 12/16
6:35 pm-8:40 pm
Nonstop4h 05m
$295
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 12/6
7:10 am-12:45 pm
Nonstop3h 35m
Lambert-St Louis
Sat 12/13
2:00 pm-6:20 pm
1 stop6h 20m
$305
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 12/6
10:09 am-12:50 am
2 stops12h 41m
Lambert-St Louis
Sat 12/13
6:00 am-3:29 pm
2 stops11h 29m
$314
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Mon 1/19
5:50 am-11:30 am
Nonstop3h 40m
Lambert-St Louis
Wed 1/21
10:15 am-5:05 pm
2 stops8h 50m
$325
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 1/27
8:45 am-5:10 pm
2 stops6h 25m
Lambert-St Louis
Thu 1/29
10:15 am-5:05 pm
2 stops8h 50m
$326
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Thu 1/8
9:55 am-9:35 pm
2 stops9h 40m
Lambert-St Louis
Sun 1/11
6:10 am-4:05 pm
2 stops11h 55m
$334
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 1/7
7:20 am-9:35 pm
2 stops12h 15m
Lambert-St Louis
Tue 2/10
5:00 pm-9:45 pm
1 stop6h 45m
$334
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Fri 11/21
5:00 am-10:40 am
Nonstop3h 40m
Lambert-St Louis
Mon 11/24
8:55 pm-11:00 pm
Nonstop4h 05m
$357
Showing 1-10 of 20 results
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 31, 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 November 6, 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 November 2, 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.
Weekly flight availability from Riverside to St. Louis
Explore weekly flight availability from Riverside to St. Louis. 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 November 6, 2025.
The most flights from R1V to STL 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 (8 on average).
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 November 6, 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.
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
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 November 6, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$122 | Average$227 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$228 | Average$384 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$257 | Average$516 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$278 | Average$408 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$283 | Average$430 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$460 | FlexibilityNo cancel fee | On-time69% |