Cheap Flights from Ontario to St. Louis
Cheap Flights from Ontario to St. Louis
Looking for cheap flights from Ontario to St. Louis? PointsYeah scans award availability across major airline and bank transfer programs in one place, so travelers can compare the lowest points and cash routes faster. Instead of searching each airline separately, users can see pricing from programs like Chase, Amex, Capital One, Citi, and Bilt side by side.
Award prices from Ontario to St. Louis vary by season, cabin, and date, but available award flights can start around 10,500–15,000 points one way, with premium cabins available at higher mileage levels. The live search above allows filtering by cabin, airline, stops, or maximum points to find the best award flights from Ontario to St. Louis for specific travel dates.
2026-11-28
ONT - STL
Economy | 1 Stop
From 10,500 Pts + $5.6
2026-11-11
ONT - STL
Economy | 1 Stop
From 15,000 Pts + $5.6
2026-11-11
ONT - STL
Economy | 1 Stop
From 15,000 Pts + $5.6
2026-11-11
ONT - STL
Economy | 1 Stop
From 15,000 Pts + $5.6
2026-11-11
ONT - STL
Economy | 1 Stop
From 15,000 Pts + $5.6
2026-11-11
ONT - STL
Economy | 1 Stop
From 15,000 Pts + $5.6
Ontario to St. Louis flight facts
Distance
1,543 mi
2,483 km in a straight line
Estimated flight time
about 3h 30m
In the air, for the straight-line distance
Time difference
+2h
St. Louis is 2 hours ahead of Ontario.
Airports in Ontario
ONT · Ontario Intl
Airports in St. Louis
STL · St Louis Lambert Intl
Nearby airport alternatives
Flights Santa Ana - St. Louis · Santa Ana is 30 mi from Ontario
Flights Burbank - St. Louis · Burbank is 44 mi from Ontario
Flights Los Angeles - St. Louis · Los Angeles is 47 mi from Ontario
Flights San Diego - St. Louis · San Diego is 94 mi from Ontario
Flights Santa Barbara - St. Louis · Santa Barbara is 130 mi from Ontario
Premium cabin flights from Ontario to St. Louis
Premium cabin
2026-12-21
ONT - STL
First | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-11-11
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-11-12
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-11-12
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-11-12
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-11-30
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Selected hotels for your next stay
St. Louis, MO (USA)
Le Méridien St. Louis Clayton
From Pts or $136
St. Louis, MO (USA)
The Ritz-Carlton, St. Louis
From Pts or $567
Frequently Asked Questions
The cheapest route from Ontario to St. Louis depends on award space, transfer bonuses, and travel dates. PointsYeah compares bank and airline programs in one place so you can find the best points and cash combinations faster.
Yes. Transferable points from Chase, Amex, Capital One, Citi, and Bilt can often be moved to airline partners for flights from Ontario to St. Louis.
Yes. Searching metro codes when available helps compare nearby airport combinations for flights from Ontario to St. Louis.
Ontario and St. Louis are about 1,543 miles (2,483 km) apart in a straight line.
Flying the 1,543-mile straight-line distance takes about 3h 30m in the air, estimated from typical cruising speed. Actual travel time depends on the routing; itineraries with connections take longer.
St. Louis is 2 hours ahead of Ontario.
Departures from Ontario: Ontario Intl (ONT). Arrivals in St. Louis: St Louis Lambert Intl (STL).
Travelers searching this route also look at other popular routes into St. Louis, plus the return trip when we track it. Fares and award space change daily.
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