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 and date, but economy flights can start around 20,700–21,000 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.
2026-04-23
ONT - STL
Economy | 1 Stop
From 20,700 Pts + $5.6
2026-04-23
ONT - STL
Economy | 1 Stop
From 20,700 Pts + $5.6
2026-04-23
ONT - STL
Economy | 1 Stop
From 20,700 Pts + $5.6
Premium cabin flights from Ontario to St. Louis
Premium cabin
2026-04-16
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-04-23
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-04-23
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-04-23
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-04-23
ONT - STL
Business | 1 Stop
From 43,600 Pts + $5.6
Premium cabin
2026-05-02
ONT - STL
Business | 1 Stop | 4 left
From 40,000 Pts + $52.2
Selected hotels for your next stay
St. Louis (United States)
Hotel Indigo St. Louis - Downtown
From 21,000 Pts or $153
St. Louis, MO (USA)
Le Méridien St. Louis Clayton
From Pts or $283
St. Louis, MO (USA)
The Ritz-Carlton, St. Louis
From Pts or $685
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.
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