Popular in | December |
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Cheapest in | April |
Round-trip from | $238 |
One-way from | $235 |
Thursday flights are generally found to be more expensive for flights from St. Louis to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.
Travelers have found it’s best to book a flight 37 days in advance to save up to 106% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 37 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to Ontario 1-2 weeks in advance for as low as $589, or $654 for flights within the next 24 hours.
Our data shows that April tends to be the cheapest month to fly to Ontario from St. Louis. Users have commonly found prices around $413 for the month, but tickets can be as low as $185. Due to multiple factors, prepare for potentially higher prices in March.
It’s optimal to fly from St. Louis to Ontario in the evening. By choosing this option you can save up to 58% on the cost of your flight, compared to a flight at noon.
Fly from
Fly to
Budget
$144 - $431
Route
Depart
Return
Price
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sat 9/14
1 stop5h 44m
Ontario
Mon 9/23
1 stop11h 43m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Tue 8/20
1 stop15h 37m
Ontario
Sun 8/25
1 stop8h 56m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sun 9/15
1 stop15h 37m
Ontario
Thu 9/19
1 stop14h 48m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Fri 9/20
1 stop5h 39m
Ontario
Tue 9/24
1 stop6h 48m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Fri 8/23
1 stop19h 32m
Ontario
Mon 8/26
1 stop16h 11m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sun 9/15
1 stop19h 32m
Ontario
Wed 9/18
1 stop12h 04m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Fri 8/9
1 stop5h 42m
Ontario
Mon 8/12
2 stops14h 40m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sat 6/29
1 stop7h 35m
Ontario
Sat 7/6
1 stop7h 15m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sat 6/22
2 stops8h 07m
Ontario
Sun 6/30
1 stop6h 55m
LAX Temperature | 57.2 - 73.4 °F |
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Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
Overall
Entertainment
Boarding
Food
Crew
Comfort
Reviews
Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.
1%of flight departures | Early morningMidnight to 6 am |
---|---|
33%of flight departures | Morning6 am to noon |
0%of flight departures | AfternoonNoon to 6 pm |
66%of flight departures | Evening6 pm to midnight |
When you search for this flight from St. Louis to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from St. Louis to Ontario for you. Better yet — we are completely free to use.
Certainly. Search results for flights to Ontario from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Yes! Start tracking prices for St. Louis to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.