Flights from Portland to Lake Forest

Cheapest flights from Portland

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$109 Roundtrip, found 5 days ago

$109

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $109 found 5 days ago

Fri, Jun 20 - Tue, Jun 24

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$158 Roundtrip, found 3 days ago

$158

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Portland Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $158 found 3 days ago

Fri, Jun 20 - Sat, Jun 21

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$163 Roundtrip, found 3 days ago

$163

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Portland Intl. to Los Angeles - Ontario Intl., returning Sat, Jun 21, priced at $163 found 3 days ago

Fri, Jun 20 - Mon, Jun 23

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$168 Roundtrip, found 3 days ago

$168

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Portland Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 23, priced at $168 found 3 days ago

Fri, Jun 20 - Sun, Jun 22

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$173 Roundtrip, found 3 days ago

$173

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jun 22, priced at $173 found 3 days ago

Tue, Jun 17 - Tue, Jun 24

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$178 Roundtrip, found 3 days ago

$178

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Portland Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $178 found 3 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$182 Roundtrip, found 5 days ago

$182

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $182 found 5 days ago

Tue, Jun 17 - Sat, Jun 21

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$183 Roundtrip, found 3 days ago

$183

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Portland Intl. to Los Angeles - Ontario Intl., returning Sat, Jun 21, priced at $183 found 3 days ago

Tue, Jun 17 - Mon, Jun 23

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$188 Roundtrip, found 3 days ago

$188

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Portland Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 23, priced at $188 found 3 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$190 Roundtrip, found 5 days ago

$190

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $190 found 5 days ago

Tue, Jun 17 - Sun, Jun 22

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$193 Roundtrip, found 3 days ago

$193

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jun 22, priced at $193 found 3 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$198 Roundtrip, found 5 days ago

$198

Roundtrip

found 5 days ago

Select Delta flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $198 found 5 days ago

Sat, Jun 21 - Sun, Jun 22

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$198 Roundtrip, found 3 days ago

$198

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 21 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jun 22, priced at $198 found 3 days ago

Fri, Jun 20 - Wed, Jun 25

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$201 Roundtrip, found 3 days ago

$201

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Portland Intl. to Los Angeles - Ontario Intl., returning Wed, Jun 25, priced at $201 found 3 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$203 Roundtrip, found 5 days ago

$203

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $203 found 5 days ago

Thu, Jun 19 - Sun, Jun 22

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$203 Roundtrip, found 3 days ago

$203

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jun 19 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jun 22, priced at $203 found 3 days ago

Sat, Jun 21 - Sat, Jun 21

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$257 Roundtrip, found 3 days ago

$257

Roundtrip

found 3 days ago

Select Delta flight, departing Sat, Jun 21 from Portland Intl. to Los Angeles - Ontario Intl., returning Sat, Jun 21, priced at $257 found 3 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$277 Roundtrip, found 5 days ago

$277

Roundtrip

found 5 days ago

Select Alaska Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $277 found 5 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$367 Roundtrip, found 5 days ago

$367

Roundtrip

found 5 days ago

Select United flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $367 found 5 days ago

Fri, Jun 27 - Sun, Jul 6

PDX

Portland Intl.

ONT

Los Angeles - Ontario Intl.

$373 Roundtrip, found 5 days ago

$373

Roundtrip

found 5 days ago

Select American Airlines flight, departing Fri, Jun 27 from Portland Intl. to Los Angeles - Ontario Intl., returning Sun, Jul 6, priced at $373 found 5 days ago