Cheap Flights from Ontario Intl. Airport (ONT) to St. Louis (STL)
Popular airlines from Ontario Intl. Airport (ONT) to St. Louis Lambert Intl. Airport (STL)
Alaska AirlinesAlaska Airlines
DeltaDelta
American AirlinesAmerican Airlines
Frontier AirlinesFrontier Airlines
Southwest AirlinesSouthwest Airlines
UnitedUnited
Be in the knowGet alerts if flight prices drop or rise*
Book smarterSave up to 45% on select hotels after you book a flight*
Travel information
Origin airport | Ontario Intl. Airport |
|---|---|
Destination airport | St. Louis Lambert Intl. Airport |
Distance | 2,481 km away |
Airlines serving | Alaska Airlines, Delta, American Airlines, Frontier Airlines, Southwest Airlines, United |
Popular airline | Alaska Airlines |
Explore a world of travel with Expedia
*Available to One Key members.