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
$270
Usually Costs
$270 – $477
Lowest We've Seen
$145
Based on 3,455 price pointshigh confidence
Monthly Price Guide
Jan
$477
Feb
$497
Mar
—
Apr
$260
May
$210
Jun
$250
Jul
$290
Aug
$355
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 $210. The most expensive month tends to be February at around $497. For the best deals, consider flying in May, June, April.
Cheapest Fare Found (Last 90 Days)
The lowest round-trip price available on each day we checked
Best: $16063 price checksWorst: $432