$66+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — STL
Feb 28 — Mar 71
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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 April, booked 51 days in advance, depart on a Friday or Thursday and return on a Thursday
Cheap 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 January 29, 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 January 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/236:29 pm
LAX
- STL
2 stops34h 22m
Frontier
Wed 2/254:51 pm
STL
- LAX
1 stop8h 27m
Frontier
Deal found 1/27![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/2310:37 pm
LAX
- STL
2 stops39h 16m
Multiple Airlines
Fri 2/2710:11 pm
STL
- LAX
1 stop12h 04m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Tue 3/246:15 am
LAX
- STL
1 stop25h 34m
Frontier
Wed 3/258:12 pm
STL
- LAX
1 stop30h 04m
Frontier
Deal found 1/27![Frontier logo]()
$199
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Wed 3/46:20 am
LAX
- STL
1 stop7h 33m
Frontier
Tue 3/108:06 pm
STL
- LAX
1 stop23h 24m
Frontier
Deal found 1/27![Frontier logo]()
$200
This Orbitz deal was found by Cheapflights users on 1/27. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:06 pm
LAX
- STL
1 stop24h 54m
Frontier
Mon 5/118:12 pm
STL
- LAX
1 stop29h 02m
Frontier
Deal found 1/27![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Fri 2/2010:59 pm
LAX
- STL
1 stop16h 47m
Frontier
Mon 2/238:47 pm
STL
- LAX
2 stops18h 29m
Frontier
Deal found 1/27![Frontier logo]()
$203
This Super.com deal was found by Cheapflights users on 1/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/31:51 pm
LAX
- STL
1 stop24h 02m
Frontier
Thu 3/510:11 pm
STL
- LAX
1 stop21h 01m
Frontier
Deal found 1/27![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Tue 4/72:37 pm
LAX
- STL
2 stops17h 11m
Frontier
Mon 4/138:16 pm
STL
- LAX
1 stop5h 56m
Frontier
Deal found 1/27![Frontier logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/2311:59 pm
LAX
- STL
2 stops28h 52m
Multiple Airlines
Wed 2/254:51 pm
STL
- LAX
1 stop8h 27m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Thu 2/199:16 pm
LAX
- STL
2 stops13h 53m
Frontier
Mon 2/231:54 pm
STL
- LAX
1 stop25h 22m
Frontier
Deal found 1/28![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Fri 3/138:57 pm
LAX
- STL
1 stop10h 52m
Multiple Airlines
Sun 3/158:06 pm
STL
- LAX
1 stop14h 05m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$211
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Sat 5/26:15 am
LAX
- STL
1 stop10h 57m
Frontier
Wed 5/64:55 pm
STL
- LAX
1 stop27h 44m
Frontier
Deal found 1/27![Frontier logo]()
$212
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 January 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $196 (Kiwi.com) |
One-way from | $66 (Kiwi.com) |
Popular in | March |
Cheapest in | October |
Average price | $400 |
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 January 29, 2026.
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
Wed 2/25
6:20 am-3:53 pm
1 stop7h 33m
Lambert-St Louis
Fri 3/6
8:12 pm-10:40 pm
2 stops28h 28m
$209
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 3/25
6:30 pm-10:31 am
2 stops14h 01m
Lambert-St Louis
Thu 3/26
8:06 pm-8:20 am
1 stop14h 14m
$288
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Wed 2/25
11:45 am-12:25 am
2 stops10h 40m
Lambert-St Louis
Wed 3/4
2:22 pm-10:45 pm
2 stops10h 23m
$294
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Mon 3/23
8:19 pm-10:32 am
2 stops12h 13m
Lambert-St Louis
Fri 3/27
8:12 pm-10:49 am
1 stop16h 37m
$311
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sun 3/22
9:28 pm-9:49 am
2 stops10h 21m
Lambert-St Louis
Sun 3/29
8:06 pm-8:20 am
1 stop14h 14m
$323
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Tue 7/7
12:45 am-8:40 am
1 stop5h 55m
Lambert-St Louis
Sat 7/11
3:50 pm-9:03 pm
1 stop7h 13m
$333
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sat 5/2
7:35 am-1:05 pm
Nonstop3h 30m
Lambert-St Louis
Sun 5/3
6:55 pm-12:15 am
1 stop7h 20m
$338
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Thu 4/30
5:00 am-10:35 am
Nonstop3h 35m
Lambert-St Louis
Sat 5/2
2:35 pm-9:25 pm
1 stop8h 50m
$338
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Sun 3/1
5:05 am-10:35 am
Nonstop3h 30m
Lambert-St Louis
Wed 3/4
5:55 pm-11:40 pm
1 stop7h 45m
$338
Los AngelesSt. Louis
LAX - STL
LAXSTL
Los Angeles
Fri 2/27
5:05 am-10:35 am
Nonstop3h 30m
Lambert-St Louis
Sun 3/1
7:00 pm-9:15 pm
Nonstop4h 15m
$343
Showing 1-10 of 24 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 January 23, 2026.
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 January 29, 2026.
It’s optimal to fly from Riverside to St. Louis in the evening. By choosing this option you can save up to 24% 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 January 24, 2026.
Travelers seeking maximum savings on their Riverside to St. Louis flight should consider departing on Saturday at noon 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.
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 January 29, 2026.
The most flights from R1V to STL are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 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 January 29, 2026.
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
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Overall
8.0
Crew
8.6
Entertainment
7.5
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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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 January 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$131 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$139 | Average$391 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$257 | Average$505 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$278 | Average$400 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$282 | Average$427 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$456 | FlexibilityNo cancel fee | On-time69% |