United Flight UA4187 Deals & Information (2025/2026)

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United Flight 4187 Route Deals From $138

The cheapest prices found with in the last 7 days for return flights were $245 and $138 for one-way flights to Portland Intl. Jetport for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 20 - Tue, Aug 26
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$245 Roundtrip, found 8 hours ago
$245
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Aug 20 from Washington Dulles Intl. to Portland Intl. Jetport, returning Tue, Aug 26, priced at $245 found 8 hours ago
Sat, Jul 5 - Thu, Jul 10
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$247 Roundtrip, found 11 hours ago
$247
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Jul 5 from Washington Dulles Intl. to Portland Intl. Jetport, returning Thu, Jul 10, priced at $247 found 11 hours ago
Mon, Jun 2 - Thu, Jun 5
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$249 Roundtrip, found 4 days ago
$249
Roundtrip
found 4 days ago
Select United flight, departing Mon, Jun 2 from Washington Dulles Intl. to Portland Intl. Jetport, returning Thu, Jun 5, priced at $249 found 4 days ago
Tue, May 27 - Sat, May 31
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$250 Roundtrip, found 17 hours ago
$250
Roundtrip
found 17 hours ago
Select United flight, departing Tue, May 27 from Washington Dulles Intl. to Portland Intl. Jetport, returning Sat, May 31, priced at $250 found 17 hours ago
Fri, Jun 6 - Sat, Jun 7
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$252 Roundtrip, found 1 day ago
$252
Roundtrip
found 1 day ago
Select United flight, departing Fri, Jun 6 from Washington Dulles Intl. to Portland Intl. Jetport, returning Sat, Jun 7, priced at $252 found 1 day ago
Thu, Jun 5 - Mon, Jun 9
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$254 Roundtrip, found 2 days ago
$254
Roundtrip
found 2 days ago
Select United flight, departing Thu, Jun 5 from Washington Dulles Intl. to Portland Intl. Jetport, returning Mon, Jun 9, priced at $254 found 2 days ago
Thu, Jun 5 - Sun, Jun 8
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$254 Roundtrip, found 17 hours ago
$254
Roundtrip
found 17 hours ago
Select United flight, departing Thu, Jun 5 from Washington Dulles Intl. to Portland Intl. Jetport, returning Sun, Jun 8, priced at $254 found 17 hours ago
Wed, Aug 20 - Tue, Aug 26
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$255 Roundtrip, found 8 hours ago
$255
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Aug 20 from Washington Dulles Intl. to Portland Intl. Jetport, returning Tue, Aug 26, priced at $255 found 8 hours ago
Sat, May 10 - Mon, May 12
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$257 Roundtrip, found 4 days ago
$257
Roundtrip
found 4 days ago
Select United flight, departing Sat, May 10 from Washington Dulles Intl. to Portland Intl. Jetport, returning Mon, May 12, priced at $257 found 4 days ago
Wed, Jul 23 - Wed, Jul 30
IAD
Washington Dulles Intl.
PWM
Portland Intl. Jetport
$259 Roundtrip, found 3 days ago
$259
Roundtrip
found 3 days ago
Select United flight, departing Wed, Jul 23 from Washington Dulles Intl. to Portland Intl. Jetport, returning Wed, Jul 30, priced at $259 found 3 days ago