$79+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
May 18 — May 251
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 71 days in advance, depart on a Wednesday or Thursday 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 April 18, 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 April 18, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/910:05 pm
LAX
- STL
2 stops14h 43m
Frontier
Sun 5/108:08 pm
STL
- LAX
1 stop6h 08m
Frontier
Deal found 4/14![Frontier logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/196:30 am
LAX
- STL
1 stop9h 36m
Multiple Airlines
Sun 5/318:08 pm
STL
- LAX
1 stop6h 08m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$321
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 5/226:30 am
LAX
- STL
1 stop11h 41m
Multiple Airlines
Mon 5/259:06 pm
STL
- LAX
1 stop13h 57m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$322
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 7/208:15 pm
LAX
- STL
2 stops16h 33m
Frontier
Mon 7/278:21 pm
STL
- LAX
1 stop15h 04m
Frontier
Deal found 4/15![Frontier logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 4/3010:53 pm
LAX
- STL
2 stops18h 28m
Frontier
Sat 5/28:17 pm
STL
- LAX
1 stop13h 24m
Frontier
Deal found 4/15![Frontier logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/176:30 am
LAX
- STL
1 stop10h 53m
Frontier
Mon 5/259:06 pm
STL
- LAX
1 stop13h 57m
Frontier
Deal found 4/14![Frontier logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/1811:39 pm
LAX
- STL
2 stops15h 54m
Multiple Airlines
Fri 5/298:08 pm
STL
- LAX
1 stop6h 08m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/196:04 pm
LAX
- STL
2 stops12h 51m
Frontier
Fri 5/298:08 pm
STL
- LAX
1 stop6h 08m
Frontier
Deal found 4/14![Frontier logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 4/294:17 pm
LAX
- STL
1 stop25h 04m
Frontier
Fri 5/18:06 pm
STL
- LAX
1 stop6h 05m
Frontier
Deal found 4/15![Frontier logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 4/2211:21 am
LAX
- STL
2 stops21h 09m
Multiple Airlines
Sat 4/258:17 pm
STL
- LAX
1 stop13h 24m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 6/187:38 pm
LAX
- STL
2 stops11h 14m
Multiple Airlines
Sun 6/212:56 pm
STL
- LAX
1 stop20h 29m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$331
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 April 18, 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 April 18, 2026.
This Southwest deal was found by Cheapflights users on 4/15. 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 5/288:15 am
LAX
- STL
1 stop5h 40m
Southwest
Sat 6/68:45 pm
STL
- LAX
Nonstop3h 55m
Southwest
Deal found 4/15![Southwest logo]()
$383
This Alaska Airlines deal was found by Cheapflights users on 4/13. 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 5/512:54 pm
LAX
- STL
1 stop9h 05m
Alaska Airlines
Wed 5/64:46 pm
STL
- LAX
1 stop8h 16m
Alaska Airlines
Deal found 4/13![Alaska Airlines logo]()
$417
This Southwest deal was found by Cheapflights users on 4/14. 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.
Fri 6/125:00 pm
LAX
- STL
1 stop6h 55m
Southwest
Mon 6/159:55 pm
STL
- LAX
Nonstop3h 50m
Southwest
Deal found 4/14![Southwest logo]()
$413
This Southwest deal was found by Cheapflights users on 4/13. 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 5/115:00 am
LAX
- STL
Nonstop3h 35m
Southwest
Wed 5/138:35 am
STL
- LAX
1 stop7h 00m
Southwest
Deal found 4/13![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 4/16. 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.
Fri 5/85:00 am
LAX
- STL
Nonstop3h 35m
Southwest
Tue 5/125:35 pm
STL
- LAX
1 stop6h 25m
Southwest
Deal found 4/16![Southwest logo]()
$467
This Alaska Airlines deal was found by Cheapflights users on 4/15. 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.
Fri 5/158:00 am
LAX
- STL
1 stop8h 45m
Alaska Airlines
Wed 5/206:21 am
STL
- LAX
Nonstop4h 16m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$576
This Southwest deal was found by Cheapflights users on 4/13. 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.
Tue 4/216:45 am
LAX
- STL
1 stop5h 45m
Southwest
Thu 4/239:40 pm
STL
- LAX
Nonstop4h 05m
Southwest
Deal found 4/13![Southwest logo]()
$485
This Southwest deal was found by Cheapflights users on 4/17. 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.
Fri 6/199:35 am
LAX
- STL
2 stops7h 35m
Southwest
Fri 6/199:55 pm
STL
- LAX
Nonstop3h 50m
Southwest
Deal found 4/17![Southwest logo]()
$488
This Southwest deal was found by Cheapflights users on 4/13. 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 5/145:30 pm
LAX
- STL
1 stop5h 00m
Southwest
Thu 5/219:40 pm
STL
- LAX
Nonstop4h 05m
Southwest
Deal found 4/13![Southwest logo]()
$548
This Southwest deal was found by Cheapflights users on 4/14. 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.
Tue 4/216:45 am
LAX
- STL
1 stop5h 45m
Southwest
Fri 4/246:05 am
STL
- LAX
1 stop6h 10m
Southwest
Deal found 4/14![Southwest logo]()
$553
This Southwest deal was found by Cheapflights users on 4/17. 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 6/175:00 am
LAX
- STL
Nonstop3h 40m
Southwest
Thu 6/189:55 pm
STL
- LAX
Nonstop3h 50m
Southwest
Deal found 4/17![Southwest logo]()
$572
Last-minute flights from Riverside to St. LouisDiscover last-minute flight deals from Riverside to St. Louis. Data last updated April 18, 2026 and is based on user searches.
Discover last-minute flight deals from Riverside to St. Louis. Data last updated April 18, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 4/2211:21 am
LAX
- STL
2 stops21h 09m
Multiple Airlines
Sat 4/258:17 pm
STL
- LAX
1 stop13h 24m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 4/224:17 pm
LAX
- STL
2 stops26h 43m
Frontier
Sat 4/258:17 pm
STL
- LAX
1 stop13h 24m
Frontier
Deal found 4/16![Frontier logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 4/294:17 pm
LAX
- STL
1 stop25h 04m
Frontier
Fri 5/18:06 pm
STL
- LAX
1 stop6h 05m
Frontier
Deal found 4/15![Frontier logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 4/3010:53 pm
LAX
- STL
2 stops18h 28m
Frontier
Sat 5/28:17 pm
STL
- LAX
1 stop13h 24m
Frontier
Deal found 4/15![Frontier logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 4/18. 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 4/308:30 am
LAX
- STL
2 stops31h 46m
Multiple Airlines
Mon 5/49:55 pm
STL
- LAX
1 stop13h 08m
Multiple Airlines
Deal found 4/18![Multiple Airlines logo]()
$331
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/910:05 pm
LAX
- STL
2 stops14h 43m
Frontier
Sun 5/108:08 pm
STL
- LAX
1 stop6h 08m
Frontier
Deal found 4/14![Frontier logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/176:30 am
LAX
- STL
1 stop10h 53m
Frontier
Mon 5/259:06 pm
STL
- LAX
1 stop13h 57m
Frontier
Deal found 4/14![Frontier logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/1811:39 pm
LAX
- STL
2 stops15h 54m
Multiple Airlines
Tue 5/268:08 pm
STL
- LAX
1 stop6h 08m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/196:30 am
LAX
- STL
1 stop9h 36m
Multiple Airlines
Sun 5/318:08 pm
STL
- LAX
1 stop6h 08m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$321
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 5/196:04 pm
LAX
- STL
2 stops12h 51m
Frontier
Fri 5/298:08 pm
STL
- LAX
1 stop6h 08m
Frontier
Deal found 4/14![Frontier logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 5/226:30 am
LAX
- STL
1 stop11h 41m
Multiple Airlines
Mon 5/259:06 pm
STL
- LAX
1 stop13h 57m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$322
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 April 18, 2026.
Search for one-way flight options from Riverside to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
This Super.com deal was found by Cheapflights users on 4/14. 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.
Sun 5/105:45 am
LAX
- STL
1 stop7h 03m
Frontier
Deal found 4/14![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 4/16. 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 5/158:59 pm
LAX
- STL
1 stop20h 24m
Frontier
Deal found 4/16![Frontier logo]()
$85
This Expedia deal was found by Cheapflights users on 4/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1212:08 pm
LAX
- STL
1 stop27h 58m
Frontier
Deal found 4/16![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 5/298:59 pm
LAX
- STL
1 stop20h 24m
Frontier
Deal found 4/17![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 4/14. 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.
Wed 5/612:08 pm
LAX
- STL
1 stop21h 33m
Frontier
Deal found 4/14![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 5/236:30 am
LAX
- STL
1 stop10h 53m
Frontier
Deal found 4/17![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 4/14. 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 5/169:40 am
LAX
- STL
1 stop7h 43m
Frontier
Deal found 4/14![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 5/139:48 am
LAX
- STL
2 stops31h 35m
Frontier
Deal found 4/17![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 5/810:07 pm
LAX
- STL
2 stops19h 16m
Frontier
Deal found 4/15![Frontier logo]()
$107
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 April 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $320 (Kiwi.com) |
One-way from | $79 (Super.com) |
Popular in | March |
Cheapest in | October |
Average price | $443 |
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 April 18, 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
Thu 5/28
8:15 am-3:55 pm
1 stop5h 40m
Lambert-St Louis
Sat 6/6
8:45 pm-10:40 pm
Nonstop3h 55m
$383
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Fri 6/12
5:00 pm-1:55 am
1 stop6h 55m
Lambert-St Louis
Mon 6/15
9:55 pm-11:45 pm
Nonstop3h 50m
$413
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Mon 5/11
5:00 am-10:35 am
Nonstop3h 35m
Lambert-St Louis
Wed 5/13
8:35 am-1:35 pm
1 stop7h 00m
$415
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 5/5
12:54 pm-11:59 pm
1 stop9h 05m
Lambert-St Louis
Wed 5/6
4:46 pm-11:02 pm
1 stop8h 16m
$417
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Fri 5/8
5:00 am-10:35 am
Nonstop3h 35m
Lambert-St Louis
Tue 5/12
5:35 pm-10:00 pm
1 stop6h 25m
$467
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 4/21
6:45 am-2:30 pm
1 stop5h 45m
Lambert-St Louis
Thu 4/23
9:40 pm-11:45 pm
Nonstop4h 05m
$485
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Fri 6/19
9:35 am-7:10 pm
2 stops7h 35m
Lambert-St Louis
Fri 6/19
9:55 pm-11:45 pm
Nonstop3h 50m
$488
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Thu 5/14
5:30 pm-12:30 am
1 stop5h 00m
Lambert-St Louis
Thu 5/21
9:40 pm-11:45 pm
Nonstop4h 05m
$548
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 4/21
6:45 am-2:30 pm
1 stop5h 45m
Lambert-St Louis
Fri 4/24
6:05 am-10:15 am
1 stop6h 10m
$553
Quickest round-trip
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 6/17
5:00 am-10:40 am
Nonstop3h 40m
Lambert-St Louis
Thu 6/18
9:55 pm-11:45 pm
Nonstop3h 50m
$572
Showing 1-10 of 23 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
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 April 17, 2026.
Booking 71 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 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 April 18, 2026.
It’s optimal to fly from Riverside to St. Louis in the evening. By choosing this option you can save up to 33% 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 April 11, 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. Sunday evenings 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 April 18, 2026.
The most flights from R1V to STL are scheduled on a Monday (9 on average). You will have fewer flight options on Tuesday, 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?
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 April 18, 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.
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
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.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Riverside to St. Louis by cabin class
Find flights from Riverside to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Riverside and St. Louis flights
Browse other Riverside and St. Louis flight options. Last updated on April 18, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on April 18, 2026.
Riverside to St. Louis flights
Consider these flights traveling from Riverside to St. Louis.
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 April 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$139 | Average$398 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$141 | Average$230 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$249 | Average$483 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$257 | Average$505 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$278 | Average$407 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$290 | Average$442 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$294 | Average$426 | FlexibilityNo cancel fee | On-time62% |