Flight Routes from St. Louis to Ontario

Compare cheap outbound and return flights from St. Louis (STL) to Ontario (ONT) and find the best offer from numerous airlines and travel agencies.

Trip type
Cheapest roundtrip flight
from€443
Fastest outbound flight
Fastest inbound flight
non-stop flights
2x / week
Flight distance
2,485 km
Time difference

Flight schedule from St. Louis (STL) to Ontario (ONT)

Select a travel date in the flight schedule for the route from St. Louis (STL) to Ontario (ONT) and compare affordable flight deals.

offers
Active filtersnone
Matching outbound flightsSTL–ONT · 1 of 1
fromto
dep.arr.
durationstopovers
  1. November 1 – 7, 2026
  2. November 8 – 14, 2026
  3. November 15 – 21, 2026
    1. STLONT
      nonstop
      1. Southwest Airlines
      No flights could be found for the active filters.

      Important flight information

      Discover more flights around St. Louis and Ontario

      Departure airport Airport St. Louis - Lambert International Airport (STL)
      Arrival airport Airport Ontario-CA (ONT)
      Destination country Flights to United States
      Departure airport - Destination country St. Louis - Lambert International Airport - United States
      Alternative routes to United States
      Alternative flights to Ontario
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