$194 Cheap Delta flights St. Louis (STL) to Ontario (ONT)

View $194 flight on Tue, Apr 28, 2026Opens in a new window

$194 Cheap Delta flights St. Louis (STL) to Ontario (ONT)

Prices were available within the past 7 days and start at $194 for one-way flights and $387 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Apr 28 - Wed, Apr 29
STL
St. Louis
ONT
Ontario
$387 Roundtrip, found 1 day ago
$387
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Apr 28 from St. Louis to Ontario, returning Wed, Apr 29, priced at $387 found 1 day ago
Delta
Wed, Apr 22 - Mon, May 11
STL
St. Louis
ONT
Ontario
$415 Roundtrip, found 1 day ago
$415
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Apr 22 from St. Louis to Ontario, returning Mon, May 11, priced at $415 found 1 day ago
Delta
Wed, Apr 29 - Sun, May 17
STL
St. Louis
ONT
Ontario
$432 Roundtrip, found 1 day ago
$432
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Apr 29 from St. Louis to Ontario, returning Sun, May 17, priced at $432 found 1 day ago

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $216
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $216

Find the cheapest month to fly from St. Louis (STL) to Ontario (ONT)

February is typically the cheapest month to fly

From $119 - $450 per traveler.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Los Angeles - Ontario Intl.
Distance
2467 km
Average flight time
6 hours 25 mins

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