Route Price Intelligence
Cheap Flights From St. Louis to Ontario
Live pricing benchmarks, monthly patterns, and historical lows for this route.
Typical Price
$455
Deals From
$290
Usually Costs
$290 – $477
Lowest We've Seen
$145
Based on 6,740 price pointshigh confidence
Monthly Price Guide
Jan
$477
Feb
$477
Mar
$346
Apr
$260
May
$230
Jun
$298
Jul
$355
Aug
$420
Sep
$477
Oct
$477
Nov
$477
Dec
$477
Cheapest Average Expensive
Best Time to Fly from St. Louis to Ontario
The cheapest time to fly from St. Louis to Ontario is typically May, when fares average around $230. The most expensive month tends to be September at around $477. For the best deals, consider flying in May, April, June.
Cheapest Fare Found (Last 90 Days)
The lowest round-trip price available on each day we checked
Best: $16081 price checksWorst: $432