June is by far the best month, wherein you can get cheapest flights for Ontario to Portland. Meanwhile, is perceived as the expensive month due to the varying factors. That’s why it’s highly advised to make advanced online flight booking to save huge amounts of money.
Disclaimer - All the mentioned fares were found within last 48 hrs. The displayed fares are based on historical data and are subject to change. The fares cannot be guaranteed at the time of booking.

Ontario
16:00
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
22:05
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
13:50
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
20:54
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
10:50
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
16:40
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
17:26
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
00:22
Portland International Airport [PDX]
Tue, 30 Jun 2026

Ontario
14:05
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
20:17
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
12:04
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
16:55
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
13:20
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
19:35
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
13:18
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
21:15
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
17:21
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
22:40
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
06:00
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
12:08
Portland International Airport [PDX]
Mon, 29 Jun 2026

Ontario
06:10
Ontario International Airport [ONT]
Mon , 29 Jun 2026

Portland
16:42
Portland International Airport [PDX]
Mon, 29 Jun 2026









