Route Price Intelligence
Cheap Flights From St. Louis to Ontario
Live pricing benchmarks, monthly patterns, and historical lows for this route.
Typical Price
$449
Deals From
$250
Usually Costs
$250 – $477
Lowest We've Seen
$145
Based on 263 price pointshigh confidence
Monthly Price Guide
Jan
$477
Feb
—
Mar
—
Apr
$345
May
$205
Jun
$230
Jul
$270
Aug
$350
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 $205. The most expensive month tends to be September at around $477. For the best deals, consider flying in May, June, July.
Cheapest Fare Found (Last 90 Days)
The lowest round-trip price available on each day we checked
Best: $16061 price checksWorst: $432