$173+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
Aug 25 — Sep 11
Round-trip
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 October or September, booked 51 days in advance, depart on a Thursday or Tuesday and return on a Thursday
Cheap flight deals from Riverside to St. Louis
Cheapest
Best
Last-minute
One-way
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 July 26, 2026.
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 26, 2026.
This CheapOair deal was found by Cheapflights users on 7/22. 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.
Fri 9/411:20 pm
LAX
- STL
1 stop14h 51m
Frontier
Mon 9/74:23 pm
STL
- LAX
1 stop27h 49m
Frontier
Deal found 7/22![Frontier logo]()
$301
This Frontier deal was found by Cheapflights users on 7/22. 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.
Thu 10/223:15 pm
LAX
- STL
1 stop8h 02m
Frontier
Sun 10/2510:35 am
STL
- LAX
1 stop9h 07m
Frontier
Deal found 7/22![Frontier logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 9/56:55 am
LAX
- STL
1 stop8h 55m
Frontier
Mon 9/76:17 pm
STL
- LAX
2 stops31h 54m
Frontier
Deal found 7/22![Frontier logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/216:55 am
LAX
- STL
1 stop8h 55m
Frontier
Sun 8/236:17 pm
STL
- LAX
2 stops31h 54m
Frontier
Deal found 7/22![Frontier logo]()
$309
This Frontier deal was found by Cheapflights users on 7/22. 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.
Sat 8/86:30 am
LAX
- STL
1 stop9h 45m
Frontier
Sat 8/158:08 pm
STL
- LAX
1 stop6h 03m
Frontier
Deal found 7/22![Frontier logo]()
$311
This CheapOair deal was found by Cheapflights users on 7/24. 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 9/36:30 am
LAX
- STL
1 stop10h 43m
Frontier
Mon 9/76:45 pm
STL
- LAX
1 stop16h 44m
Frontier
Deal found 7/24![Frontier logo]()
$312
This Frontier deal was found by Cheapflights users on 7/25. 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.
Fri 8/146:30 am
LAX
- STL
1 stop9h 45m
Frontier
Wed 8/196:45 pm
STL
- LAX
1 stop5h 54m
Frontier
Deal found 7/25![Frontier logo]()
$313
This Frontier deal was found by Cheapflights users on 7/26. 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.
Fri 9/2510:04 pm
LAX
- STL
1 stop11h 28m
Frontier
Sun 9/2712:27 pm
STL
- LAX
1 stop8h 17m
Frontier
Deal found 7/26![Frontier logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/106:30 am
LAX
- STL
1 stop9h 45m
Frontier
Tue 8/118:08 pm
STL
- LAX
1 stop30h 03m
Frontier
Deal found 7/22![Frontier logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 8/179:09 pm
LAX
- STL
2 stops17h 07m
Frontier
Thu 8/207:58 pm
STL
- LAX
1 stop6h 13m
Frontier
Deal found 7/25![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 8/216:55 am
LAX
- STL
1 stop8h 55m
Frontier
Mon 8/247:58 pm
STL
- LAX
2 stops15h 31m
Frontier
Deal found 7/25![Frontier logo]()
$320
Best flights from Riverside to St. LouisDiscover carefully curated flight deals from Riverside to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 26, 2026.
Discover carefully curated flight deals from Riverside to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 26, 2026.
This Southwest deal was found by Cheapflights users on 7/21. 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.
Sat 8/226:00 am
LAX
- STL
Nonstop3h 40m
Southwest
Sat 8/298:30 am
STL
- LAX
Nonstop3h 55m
Southwest
Deal found 7/21![Southwest logo]()
$393
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Tue 8/1812:10 am
LAX
- STL
1 stop6h 29m
United Airlines
Wed 8/194:40 pm
STL
- LAX
1 stop8h 02m
United Airlines
Deal found 7/21![United Airlines logo]()
$432
This Southwest deal was found by Cheapflights users on 7/21. 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 9/306:50 am
LAX
- STL
Nonstop3h 35m
Southwest
Mon 10/59:55 pm
STL
- LAX
Nonstop4h 00m
Southwest
Deal found 7/21![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 7/22. 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.
Thu 8/137:10 pm
LAX
- STL
Nonstop3h 35m
Southwest
Sat 8/158:30 am
STL
- LAX
Nonstop3h 55m
Southwest
Deal found 7/22![Southwest logo]()
$417
This Southwest deal was found by Cheapflights users on 7/24. 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.
Sat 8/226:00 am
LAX
- STL
Nonstop3h 40m
Southwest
Tue 8/2512:20 pm
STL
- LAX
1 stop8h 30m
Southwest
Deal found 7/24![Southwest logo]()
$420
This Southwest deal was found by Cheapflights users on 7/22. 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 8/1211:55 am
LAX
- STL
1 stop8h 15m
Southwest
Thu 8/139:05 pm
STL
- LAX
Nonstop3h 55m
Southwest
Deal found 7/22![Southwest logo]()
$427
This Southwest deal was found by Cheapflights users on 7/25. 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 9/2111:20 am
LAX
- STL
1 stop5h 00m
Southwest
Mon 9/286:25 am
STL
- LAX
Nonstop3h 55m
Southwest
Deal found 7/25![Southwest logo]()
$427
This Southwest deal was found by Cheapflights users on 7/24. 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 10/145:55 am
LAX
- STL
Nonstop3h 30m
Southwest
Sun 10/189:55 pm
STL
- LAX
Nonstop4h 00m
Southwest
Deal found 7/24![Southwest logo]()
$428
This Southwest deal was found by Cheapflights users on 7/21. 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.
Sat 9/55:35 am
LAX
- STL
2 stops7h 50m
Southwest
Sat 9/122:25 pm
STL
- LAX
2 stops7h 50m
Southwest
Deal found 7/21![Southwest logo]()
$433
This Southwest deal was found by Cheapflights users on 7/22. 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.
Thu 10/85:55 pm
LAX
- STL
Nonstop3h 30m
Southwest
Sun 10/119:55 pm
STL
- LAX
Nonstop4h 00m
Southwest
Deal found 7/22![Southwest logo]()
$435
Last-minute flights from Riverside to St. LouisDiscover last-minute flight deals from Riverside to St. Louis. Data last updated July 26, 2026 and is based on user searches.
Discover last-minute flight deals from Riverside to St. Louis. Data last updated July 26, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/36:30 am
LAX
- STL
1 stop9h 45m
Frontier
Mon 8/247:58 pm
STL
- LAX
2 stops15h 31m
Frontier
Deal found 7/22![Frontier logo]()
$321
This Frontier deal was found by Cheapflights users on 7/22. 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.
Sat 8/86:30 am
LAX
- STL
1 stop9h 45m
Frontier
Sat 8/158:08 pm
STL
- LAX
1 stop6h 03m
Frontier
Deal found 7/22![Frontier logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/911:00 pm
LAX
- STL
1 stop22h 59m
Frontier
Wed 8/128:08 pm
STL
- LAX
1 stop14h 22m
Frontier
Deal found 7/22![Frontier logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/106:30 am
LAX
- STL
1 stop9h 45m
Frontier
Tue 8/118:08 pm
STL
- LAX
1 stop30h 03m
Frontier
Deal found 7/22![Frontier logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 7/24. 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 8/1211:00 pm
LAX
- STL
2 stops16h 37m
Frontier
Thu 8/206:45 pm
STL
- LAX
1 stop5h 54m
Frontier
Deal found 7/24![Frontier logo]()
$323
This Frontier deal was found by Cheapflights users on 7/25. 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.
Fri 8/146:30 am
LAX
- STL
1 stop9h 45m
Frontier
Wed 8/196:45 pm
STL
- LAX
1 stop5h 54m
Frontier
Deal found 7/25![Frontier logo]()
$313
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 8/179:09 pm
LAX
- STL
2 stops17h 07m
Frontier
Thu 8/207:58 pm
STL
- LAX
1 stop6h 13m
Frontier
Deal found 7/25![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/216:55 am
LAX
- STL
1 stop8h 55m
Frontier
Sun 8/236:17 pm
STL
- LAX
2 stops31h 54m
Frontier
Deal found 7/22![Frontier logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 8/216:55 am
LAX
- STL
1 stop8h 55m
Frontier
Mon 8/247:58 pm
STL
- LAX
2 stops15h 31m
Frontier
Deal found 7/25![Frontier logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 8/226:55 am
LAX
- STL
1 stop8h 55m
Frontier
Tue 8/255:27 pm
STL
- LAX
2 stops17h 28m
Frontier
Deal found 7/25![Frontier logo]()
$325
One-way flights from Riverside to St. LouisSearch for one-way flight options from Riverside to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 26, 2026.
Search for one-way flight options from Riverside to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/24. 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 9/1810:04 pm
LAX
- STL
2 stops19h 13m
Frontier
Deal found 7/24![Frontier logo]()
$173
This Super.com deal was found by Cheapflights users on 7/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:00 am
LAX
- STL
1 stop7h 23m
Frontier
Deal found 7/23![Frontier logo]()
$174
This Super.com deal was found by Cheapflights users on 7/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/86:30 am
LAX
- STL
1 stop9h 45m
Frontier
Deal found 7/21![Frontier logo]()
$176
This Super.com deal was found by Cheapflights users on 7/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:30 am
LAX
- STL
1 stop9h 35m
Frontier
Deal found 7/21![Frontier logo]()
$177
This Super.com deal was found by Cheapflights users on 7/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/146:30 am
LAX
- STL
1 stop9h 45m
Frontier
Deal found 7/21![Frontier logo]()
$179
This Super.com deal was found by Cheapflights users on 7/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:30 am
LAX
- STL
1 stop10h 53m
Frontier
Deal found 7/25![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 7/23. 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 8/46:30 am
LAX
- STL
1 stop9h 35m
Frontier
Deal found 7/23![Frontier logo]()
$181
This Super.com deal was found by Cheapflights users on 7/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:55 am
LAX
- STL
1 stop8h 55m
Frontier
Deal found 7/23![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/152:01 pm
LAX
- STL
2 stops22h 55m
Frontier
Deal found 7/22![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/1111:10 pm
LAX
- STL
2 stops32h 30m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$187
Find 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 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $301 (CheapOair) |
One-way from | $173 (Kiwi.com) |
Popular in | March |
Cheapest in | October |
Average price | $477 |
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 26, 2026.
Use the filters below to find and compare flights from Riverside to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 8/22
6:00 am-11:40 am
Nonstop3h 40m
Lambert-St Louis
Sat 8/29
8:30 am-10:25 am
Nonstop3h 55m
$393
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 9/30
6:50 am-12:25 pm
Nonstop3h 35m
Lambert-St Louis
Mon 10/5
9:55 pm-11:55 pm
Nonstop4h 00m
$405
Quickest round-trip
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Thu 8/13
7:10 pm-12:45 am
Nonstop3h 35m
Lambert-St Louis
Sat 8/15
8:30 am-10:25 am
Nonstop3h 55m
$417
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 8/22
6:00 am-11:40 am
Nonstop3h 40m
Lambert-St Louis
Tue 8/25
12:20 pm-6:50 pm
1 stop8h 30m
$420
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 8/12
11:55 am-10:10 pm
1 stop8h 15m
Lambert-St Louis
Thu 8/13
9:05 pm-11:00 pm
Nonstop3h 55m
$427
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Mon 9/21
11:20 am-6:20 pm
1 stop5h 00m
Lambert-St Louis
Mon 9/28
6:25 am-8:20 am
Nonstop3h 55m
$427
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 10/14
5:55 am-11:25 am
Nonstop3h 30m
Lambert-St Louis
Sun 10/18
9:55 pm-11:55 pm
Nonstop4h 00m
$428
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 8/18
12:10 am-8:39 am
1 stop6h 29m
Lambert-St Louis
Wed 8/19
4:40 pm-10:42 pm
1 stop8h 02m
$432
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 9/5
5:35 am-3:25 pm
2 stops7h 50m
Lambert-St Louis
Sat 9/12
2:25 pm-8:15 pm
2 stops7h 50m
$433
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Thu 10/8
5:55 pm-11:25 pm
Nonstop3h 30m
Lambert-St Louis
Sun 10/11
9:55 pm-11:55 pm
Nonstop4h 00m
$435
Showing 1-10 of 20 resultsSorted by cheapest first
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.
LAX-STL
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
R1V-STL
LAX-STL
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 26, 2026.
It’s optimal to fly from Riverside to St. Louis in the evening. By choosing this option you can save up to 39% on the cost of your flight, compared to a flight at noon.
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 July 26, 2026.
The most flights from R1V to STL are scheduled on a Thursday (10 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (7 on average).
How much does it cost to fly round-trip from Riverside to St. Louis?
Airfare is below average for this route at the moment.
Riverside to St. Louis flights typically cost between $360 and $494 in September.The cheapest round-trip price found within the last 5 days was $301 on Frontier (Sep 4-Sep 7).
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 July 18, 2026.
Travelers seeking maximum savings on their Riverside to St. Louis flight should consider departing on Tuesday 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 26, 2026.
See what other customers who have flown with Southwest,Delta, andUnited 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
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Riverside and St. Louis flights
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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 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$105 | Average$237 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$165 | Average$421 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$249 | Average$449 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$257 | Average$487 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$292 | Average$456 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$294 | Average$426 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$300 | Average$482 | FlexibilityNo cancel fee | On-time63% |