Flights from Portland to Niwot

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, Jul 18 - Mon, Jul 21

PDX

Portland Intl.

DEN

Denver Intl.

$159 Roundtrip, found 1 day ago

$159

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 18 from Portland Intl. to Denver Intl., returning Mon, Jul 21, priced at $159 found 1 day ago

Wed, Nov 19 - Tue, Dec 2

PDX

Portland Intl.

DEN

Denver Intl.

$165 Roundtrip, found 2 days ago

$165

Roundtrip

found 2 days ago

Select Delta flight, departing Wed, Nov 19 from Portland Intl. to Denver Intl., returning Tue, Dec 2, priced at $165 found 2 days ago

Wed, Nov 19 - Thu, Dec 4

PDX

Portland Intl.

DEN

Denver Intl.

$185 Roundtrip, found 2 days ago

$185

Roundtrip

found 2 days ago

Select Delta flight, departing Wed, Nov 19 from Portland Intl. to Denver Intl., returning Thu, Dec 4, priced at $185 found 2 days ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$189 Roundtrip, found 21 hours ago

$189

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $189 found 21 hours ago

Tue, Jul 1 - Wed, Jul 9

PDX

Portland Intl.

DEN

Denver Intl.

$197 Roundtrip, found 21 hours ago

$197

Roundtrip

found 21 hours ago

Select Hawaiian Airlines flight, departing Tue, Jul 1 from Portland Intl. to Denver Intl., returning Wed, Jul 9, priced at $197 found 21 hours ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$207 Roundtrip, found 21 hours ago

$207

Roundtrip

found 21 hours ago

Select Alaska Airlines flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $207 found 21 hours ago

Mon, Jun 30 - Wed, Jul 9

PDX

Portland Intl.

DEN

Denver Intl.

$207 Roundtrip, found 21 hours ago

$207

Roundtrip

found 21 hours ago

Select Alaska Airlines flight, departing Mon, Jun 30 from Portland Intl. to Denver Intl., returning Wed, Jul 9, priced at $207 found 21 hours ago

Wed, Nov 19 - Fri, Nov 28

PDX

Portland Intl.

DEN

Denver Intl.

$212 Roundtrip, found 2 days ago

$212

Roundtrip

found 2 days ago

Select Alaska Airlines flight, departing Wed, Nov 19 from Portland Intl. to Denver Intl., returning Fri, Nov 28, priced at $212 found 2 days ago

Fri, Jul 18 - Mon, Jul 21

PDX

Portland Intl.

DEN

Denver Intl.

$215 Roundtrip, found 1 day ago

$215

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 18 from Portland Intl. to Denver Intl., returning Mon, Jul 21, priced at $215 found 1 day ago

Sat, Jul 5 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$217 Roundtrip, found 21 hours ago

$217

Roundtrip

found 21 hours ago

Select Delta flight, departing Sat, Jul 5 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $217 found 21 hours ago

Tue, Jul 1 - Thu, Jul 10

PDX

Portland Intl.

DEN

Denver Intl.

$217 Roundtrip, found 21 hours ago

$217

Roundtrip

found 21 hours ago

Select Alaska Airlines flight, departing Tue, Jul 1 from Portland Intl. to Denver Intl., returning Thu, Jul 10, priced at $217 found 21 hours ago

Fri, Jul 18 - Mon, Jul 21

PDX

Portland Intl.

DEN

Denver Intl.

$217 Roundtrip, found 1 day ago

$217

Roundtrip

found 1 day ago

Select United flight, departing Fri, Jul 18 from Portland Intl. to Denver Intl., returning Mon, Jul 21, priced at $217 found 1 day ago

Mon, Nov 24 - Tue, Dec 2

PDX

Portland Intl.

DEN

Denver Intl.

$226 Roundtrip, found 2 days ago

$226

Roundtrip

found 2 days ago

Select Delta flight, departing Mon, Nov 24 from Portland Intl. to Denver Intl., returning Tue, Dec 2, priced at $226 found 2 days ago

Fri, Jul 4 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$227 Roundtrip, found 21 hours ago

$227

Roundtrip

found 21 hours ago

Select Delta flight, departing Fri, Jul 4 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $227 found 21 hours ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$227 Roundtrip, found 21 hours ago

$227

Roundtrip

found 21 hours ago

Select Alaska Airlines flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $227 found 21 hours ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$230 Roundtrip, found 21 hours ago

$230

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $230 found 21 hours ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$232 Roundtrip, found 21 hours ago

$232

Roundtrip

found 21 hours ago

Select United flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $232 found 21 hours ago

Fri, Jul 18 - Mon, Jul 21

PDX

Portland Intl.

DEN

Denver Intl.

$237 Roundtrip, found 1 day ago

$237

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 18 from Portland Intl. to Denver Intl., returning Mon, Jul 21, priced at $237 found 1 day ago

Fri, Jul 18 - Mon, Jul 21

PDX

Portland Intl.

DEN

Denver Intl.

$237 Roundtrip, found 1 day ago

$237

Roundtrip

found 1 day ago

Select United flight, departing Fri, Jul 18 from Portland Intl. to Denver Intl., returning Mon, Jul 21, priced at $237 found 1 day ago

Wed, Jul 2 - Tue, Jul 8

PDX

Portland Intl.

DEN

Denver Intl.

$312 Roundtrip, found 21 hours ago

$312

Roundtrip

found 21 hours ago

Select American Airlines flight, departing Wed, Jul 2 from Portland Intl. to Denver Intl., returning Tue, Jul 8, priced at $312 found 21 hours ago