Route Price Intelligence
Cheap Flights From St. Louis to Ontario
Live pricing benchmarks, monthly patterns, and historical lows for this route.
Typical Price
$437
Deals From
$318
Usually Costs
$318 – $437
Lowest We've Seen
$145
Based on 8,025 price pointshigh confidence
Monthly Price Guide
Jan
$330
Feb
$251
Mar
$264
Apr
$275
May
$377
Jun
$437
Jul
$437
Aug
$437
Sep
$437
Oct
$437
Nov
$437
Dec
$437
Cheapest Average Expensive
Best Time to Fly from St. Louis to Ontario
The cheapest time to fly from St. Louis to Ontario is typically February, when fares average around $251. The most expensive month tends to be September at around $437. For the best deals, consider flying in February, March, April.
Cheapest Fare Found (Last 90 Days)
The lowest round-trip price available on each day we checked
Best: $14559 price checksWorst: $432