Flights to Ontario from $ 152*
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1 Passenger, Economy
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today
today
United's most popular flights to Ontario (ONT)
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flight_land
$
San Francisco (SFO)to
Ontario (ONT)01/14/26 - 01/21/26
from
$ 169
Viewed: 11 hours ago
Roundtrip
Economy
Chicago (ORD)to
Ontario (ONT)01/20/26 - 01/27/26
from
$ 324
Viewed: 13 hours ago
Roundtrip
Economy
Denver (DEN)to
Ontario (ONT)02/10/26 - 02/14/26
from
$ 157
Viewed: 15 hours ago
Roundtrip
Economy
Newark/New York (EWR)to
Ontario (ONT)01/20/26 - 01/27/26
from
$ 313
Viewed: 15 hours ago
Roundtrip
Economy
Houston (IAH)to
Ontario (ONT)02/03/26 - 02/07/26
from
$ 333
Viewed: 14 hours ago
Roundtrip
Economy
Boston (BOS)to
Ontario (ONT)01/21/26 - 01/24/26
from
$ 237
Viewed: 16 hours ago
Roundtrip
Economy
Portland, OR (PDX)to
Ontario (ONT)01/21/26 - 01/24/26
from
$ 152
Viewed: 12 hours ago
Roundtrip
Economy
Cleveland (CLE)to
Ontario (ONT)01/20/26 - 01/27/26
from
$ 301
Viewed: 16 hours ago
Roundtrip
Economy
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.
Business class deals on flights to Ontario (ONT)
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flight_land
$
San Francisco (SFO)to
Ontario (ONT)
12/30/25 - 01/04/26
Roundtrip
Business
from
$ 350
Viewed: 1 day ago
Chicago (ORD)to
Ontario (ONT)
03/03/26 - 03/10/26
Roundtrip
Business
from
$ 953
Viewed: 1 day ago
Denver (DEN)to
Ontario (ONT)
01/31/26 - 02/07/26
Roundtrip
Business
from
$ 427
Viewed: 13 hours ago
Newark/New York (EWR)to
Ontario (ONT)
01/05/26 - 01/08/26
Roundtrip
Business
from
$ 1,290
Viewed: 1 hour ago
Houston (IAH)to
Ontario (ONT)
01/02/26 - 01/06/26
Roundtrip
Business
from
$ 671
Viewed: 19 hours ago
Seattle (SEA)to
Ontario (ONT)
01/02/26 - 01/06/26
Roundtrip
Business
from
$ 872
Viewed: 1 day ago
Washington, D.C. (IAD)to
Ontario (ONT)
12/28/25 - 01/01/26
Roundtrip
Business
from
$ 1,708
Viewed: 16 hours ago
Philadelphia (PHL)to
Ontario (ONT)
12/24/25 - 12/30/25
Roundtrip
Business
from
$ 1,637
Viewed: 18 hours ago
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.
Things to do after your flight to Ontario (ONT)
Fly to Ontario with United Airlines from over 200 airports within the United States and an additional 100 airports internationally.
Ontario’s top attractions
- Visit the Ontario Museum of History and Art for an overview of the region.
- Tour the grand Graber Olive House, home to the oldest operating olive packer in the U.S.
- Shop till you drop at Ontario Mills.
- Take the family to Scandia Ontario, an amusement park with rides, mini golf, go karts and games.
- Head to iFLY Ontario for an indoor skydiving experience.
- Relax on the beaches in nearby Los Angeles County.
Best time to travel to Ontario
Visit Ontario during the summer and fall for sunny and dry weather. The Los Angeles County Fair is held for four weeks each fall, beginning on Labor Day. Taste diverse food and drinks from near and far, see farm animals, learn more about agriculture and enjoy live entertainment. The Lights on Miracle Hill in nearby Walnut is the perfect winter warm up for the holidays.