Non-stop from Chicago to Ontario, California (& vice versa) for only $144 roundtrip

_Chicago / _Ontario / Chicago / Chicago, USA → Chicago, USA / Chicago, USA → Ontario, USA / Deal / Depart USA / Economy / Flight / Non-Stop / North America / Ontario / Ontario, USA → Chicago, USA / Ontario, USA → Ontario, USA / Standard Route / United Airlines
Flight deals from Chicago to Ontario, California | Secret Flying
All the information on this page is accurate at the time of publication.

If you are viewing this deal at a later date, the price and availability may no longer be as advertised.

Become a Secret Flying member to receive alerts to your inbox the moment we publish a flight deal.

Non-stop flights from Chicago to Ontario, California for only $144 roundtrip with United Airlines.

Also works in reverse.

 

DEPART:
Chicago, USA

 

ARRIVE:
Ontario, USA

 

RETURN:
Chicago, USA

 

DATES:
Availability from September 2026 to February 2027 (excluding Christmas/New Year)

Example dates:

 

Chicago – Ontario
5th-12th Sep
12th-19th Sep
7th-14th Nov
10th-17th Nov
6th-13th Feb
13th-20th Feb

 

Ontario – Chicago
5th-12th Sep
12th-19th Sep
31st Oct – 7th Nov
7th-14th Nov
30th Jan – 6th Feb
6th-13th Feb
20th-27th Feb

and more…

 

STOPS:

 

AIRLINES:
United Airlines

 

 

GO TO DEAL

 

Non-stop flights from Chicago to Ontario, California for only $144 roundtrip with United Airlines. Also works in reverse. Flight deal ticket image.

Find a hotel to go with your flight to
Ontario