Flights from St Louis to Ontario

Did you mean Flights from Ontario to St Louis?

St Louis

United States

STL

Lambert St Louis International Airport

Ontario

United States

ONT

Ontario International Airport

Route: Published service includes stops
Distance: 1,543 miles
Marketing airlines: 1 airline
Aircraft: 3 aircraft types
Dates: Oct 25 – Dec 12, 2026

Observed award fares

A sample of one-way prices for one traveler from Roame’s fare cache. Points, fees, and seats describe the same observation. Availability can change; confirm with the loyalty program before transferring points.

Departure window: 2026-10-23 – 2026-11-21.

No recent fares appear in this limited preview. This does not mean the route is sold out. Use the search controls to check other dates and routes.

St Louis to Ontario route overview

Lambert St Louis International Airport (STL) serves St Louis; Ontario International Airport (ONT) serves Ontario.

The airports are 1,543 miles apart by great-circle distance.

Roame's current schedule feed lists service with stops from STL to ONT, but no nonstop service.

Marketing airlines listed in the current schedule, including codeshare sellers, are Southwest Airlines (WN). This list does not identify the operating airline for each flight; check the flight details before booking.

Published schedule dates span Oct 25 – Dec 12, 2026.

Marketing airlines on the St Louis to Ontario route

These are marketing airlines, including codeshare sellers. This list does not identify the operating airline for each flight; check the flight details before booking.

Aircraft flying from STL to ONT

Frequently asked questions

Which airports serve the St Louis to Ontario route?

Lambert St Louis International Airport (STL) is the origin airport and Ontario International Airport (ONT) is the destination airport.

How far is Ontario from St Louis?

STL and ONT are approximately 1,543 miles apart by great-circle distance.

Are there direct flights from STL to ONT?

No. Roame's current schedule feed lists service with stops from STL to ONT, but no nonstop service.

Which airlines market flights from STL to ONT?

Which aircraft fly from STL to ONT?

Aircraft listed in the current schedule include Boeing 737-800 Winglets (73H), Boeing 737 MAX 8 (7M8) and 7S7.