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Oakland to Ontario Flights — Fares from $120.00 | OAK–ONT

Compare the cheapest Oakland (OAK) to Ontario (ONT) fares found by our live flight search, then book online or over the phone with our travel experts.

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Adults
12+
1
Children
2–11
0
Infants
Under 2
0
Cabin
🏷️
Save up to 40% with unpublished phone fares
Consolidator deals on selected Oakland → Ontario flights that do not appear in online search results. The live fares below are bookable right now — or call to check for an unpublished fare on your dates.
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One-way fares Oakland → Ontario

showing indicative fares · loading live prices…
Frontier
Frontier CHEAPEST
OAK → ONT · Economy
lowest fare seen on this route
$200.59
$120.35
Select
Alaska Airlines
Alaska Airlines
OAK → ONT · Economy
lowest fare seen on this route
$719.20
$431.52
Select
Delta Air Lines
Delta Air Lines
OAK → ONT · Economy
lowest fare seen on this route
$900.20
$540.12
Select
See all flights & times → Prices per adult, one way, incl. taxes & fees. Availability changes constantly.
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Live fares we can book on OAK–ONT

Lowest fare found per airline on the OAK → ONT route, with our discounted phone-deal price.

AirlineCabin Found fareOur discounted fare Fare found on
Frontier Frontier Economy $200.59 $120.35 Sep 12, 2026 Book
Alaska Airlines Alaska Airlines Economy $719.20 $431.52 Sep 12, 2026 Book
Delta Air Lines Delta Air Lines Economy $900.20 $540.12 Sep 12, 2026 Book

Discounted fares are negotiated phone deals from our vendor network and may not appear in online search results — call 1-856-513-6369 to lock one in. Fares were found on the dates shown, are per person in USD, and change with availability.

More routes we cover

↩ Ontario to Oakland Oakland to Atlanta Oakland to Dallas Oakland to Everett Oakland to Las Vegas Oakland to Los Angeles Oakland to Memphis Atlanta to Ontario Augusta to Ontario Austin to Ontario Baltimore to Ontario Boise to Ontario Boston to Ontario All routes →

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FlyLemo is an independent travel agency — call 1-856-513-6369 or use the search above to compare live fares on this route. See our terms, privacy policy, refund policy and service fees for full details, or contact us any time.

Page updated September 13, 2026 · fare data refreshed automatically from live flight searches.