Portland to Ontario in August 2026

Dated one-way fares from Portland to Ontario in August 2026. Use the calendar to see which days are cheaper.

Lowest this month $168

Highest this month $173

Sample fare $165

Airports PDX–ONT

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August 2026 price calendar

From $168 · up to $173

Mon

Tue

Wed

Thu

Fri

Sat

Sun

27 $168 28 $173 29 $173

Ontario ONT

$168

Aug 27, 5:15am · 6h 48m · 1 stop

PDX → ONT · American Airlines

Ontario ONT

$173

Aug 28, 12:20pm · 11h 30m · 1 stop

PDX → ONT · Frontier Airlines

Ontario ONT

$173

Aug 29, 12:20pm · 11h 30m · 1 stop

PDX → ONT · Frontier Airlines

This page is only August 2026 on the Portland to Ontario route. Open the full route if you want the next months side by side.

Prices move as seats sell. Confirm the live itinerary before you book Portland to Ontario in August 2026.