United Flight 4138 Deals & Information (2026/2027)

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United Flight 4138 Route Deals From $60

The cheapest prices found with in the last 7 days for return flights were $120 and $60 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 20 - Sat, Feb 21
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$120 Roundtrip, found 1 day ago
$120
Roundtrip
found 1 day ago
Select United flight, departing Fri, Feb 20 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Sat, Feb 21, priced at $120 found 1 day ago
Sat, Feb 14 - Wed, Feb 18
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$120 Roundtrip, found 17 hours ago
$120
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Feb 14 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Wed, Feb 18, priced at $120 found 17 hours ago
Wed, Mar 18 - Thu, Mar 19
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$126 Roundtrip, found 1 day ago
$126
Roundtrip
found 1 day ago
Select United flight, departing Wed, Mar 18 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Thu, Mar 19, priced at $126 found 1 day ago
Sun, Feb 8 - Wed, Feb 11
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$129 Roundtrip, found 4 days ago
$129
Roundtrip
found 4 days ago
Select United flight, departing Sun, Feb 8 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Wed, Feb 11, priced at $129 found 4 days ago
Tue, Oct 27 - Thu, Oct 29
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$129 Roundtrip, found 1 day ago
$129
Roundtrip
found 1 day ago
Select United flight, departing Tue, Oct 27 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Thu, Oct 29, priced at $129 found 1 day ago
Fri, Feb 20 - Sat, Feb 21
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$130 Roundtrip, found 1 day ago
$130
Roundtrip
found 1 day ago
Select United flight, departing Fri, Feb 20 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Sat, Feb 21, priced at $130 found 1 day ago
Thu, Mar 5 - Fri, Mar 6
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$132 Roundtrip, found 6 days ago
$132
Roundtrip
found 6 days ago
Select United flight, departing Thu, Mar 5 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Fri, Mar 6, priced at $132 found 6 days ago
Fri, May 15 - Sun, May 17
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$133 Roundtrip, found 5 days ago
$133
Roundtrip
found 5 days ago
Select United flight, departing Fri, May 15 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Sun, May 17, priced at $133 found 5 days ago
Fri, Feb 6 - Sat, Feb 7
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$135 Roundtrip, found 17 hours ago
$135
Roundtrip
found 17 hours ago
Select United flight, departing Fri, Feb 6 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Sat, Feb 7, priced at $135 found 17 hours ago
Sun, Feb 1 - Sun, Feb 8
EWR
Newark Liberty Intl. Airport
IAD
Washington Dulles Intl.
$141 Roundtrip, found 3 days ago
$141
Roundtrip
found 3 days ago
Select United flight, departing Sun, Feb 1 from Newark Liberty Intl. Airport to Washington Dulles Intl., returning Sun, Feb 8, priced at $141 found 3 days ago