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Cheap flights from Phoenix to ONT

Recently found return fares from $88, with December the cheapest month we know of. Compare dates, then book with the partner you choose.

Cheapest months to fly

Lowest recently found return fare in each month. Tap a month to see that month's calendar.

$166 Oct2026 $114 Nov2026 $88 Dec2026 $88 Jan2027 $126 Feb2027

Phoenix → ONT

November 2026

Mon Tue Wed Thu Fri Sat Sun 1 $145 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
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Lowest fares for the best day

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Airport in Phoenix

  • PHXSky Harbor

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PHX
ONT

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More trips from Phoenix

All flights from Phoenix ONT to Phoenix flights
Los Angelesfrom $54 Denverfrom $116 LGBfrom $139 Dallasfrom $151 Chicagofrom $183 PNSfrom $192 San Franciscofrom $213 DTTfrom $231

FAQ

Questions about this route

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Help center Contact us
01What is the cheapest month to fly from Phoenix to ONT?

Based on recently found fares, December 2026 has the lowest price we know of, from $88. Prices change often, so check the calendar for current fares.

02Are the prices on this page final?

No. They are recently found fares. When you open a deal, the partner shows the live price, including taxes and fees, before you pay.

03How can I get an alert when flights to ONT get cheaper?

Use the price alert on this page. Choose your dates or a whole month and we will email you when the fare drops.