United Flight 3666 Deals & Information (2026/2027)

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United Flight 3666 Route Deals From $93

The cheapest prices found with in the last 7 days for return flights were $204 and $93 for one-way flights to Ronald Reagan Washington National for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Aug 13 - Tue, Aug 18
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$204 Roundtrip, found 1 day ago
$204
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 13 from O'Hare Intl. to Ronald Reagan Washington National, returning Tue, Aug 18, priced at $204 found 1 day ago
Wed, May 13 - Sat, May 16
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$209 Roundtrip, found 1 day ago
$209
Roundtrip
found 1 day ago
Select United flight, departing Wed, May 13 from O'Hare Intl. to Ronald Reagan Washington National, returning Sat, May 16, priced at $209 found 1 day ago
Sat, Aug 15 - Sat, Aug 22
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$223 Roundtrip, found 10 hours ago
$223
Roundtrip
found 10 hours ago
Select United flight, departing Sat, Aug 15 from O'Hare Intl. to Ronald Reagan Washington National, returning Sat, Aug 22, priced at $223 found 10 hours ago
Thu, May 28 - Mon, Jun 1
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$228 Roundtrip, found 7 hours ago
$228
Roundtrip
found 7 hours ago
Select United flight, departing Thu, May 28 from O'Hare Intl. to Ronald Reagan Washington National, returning Mon, Jun 1, priced at $228 found 7 hours ago
Sat, Aug 15 - Sat, Aug 22
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$234 Roundtrip, found 10 hours ago
$234
Roundtrip
found 10 hours ago
Select United flight, departing Sat, Aug 15 from O'Hare Intl. to Ronald Reagan Washington National, returning Sat, Aug 22, priced at $234 found 10 hours ago
Thu, Aug 20 - Thu, Aug 27
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$236 Roundtrip, found 16 hours ago
$236
Roundtrip
found 16 hours ago
Select United flight, departing Thu, Aug 20 from O'Hare Intl. to Ronald Reagan Washington National, returning Thu, Aug 27, priced at $236 found 16 hours ago
Mon, May 11 - Tue, May 12
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$241 Roundtrip, found 1 day ago
$241
Roundtrip
found 1 day ago
Select United flight, departing Mon, May 11 from O'Hare Intl. to Ronald Reagan Washington National, returning Tue, May 12, priced at $241 found 1 day ago
Thu, Aug 13 - Tue, Aug 18
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$244 Roundtrip, found 1 day ago
$244
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 13 from O'Hare Intl. to Ronald Reagan Washington National, returning Tue, Aug 18, priced at $244 found 1 day ago
Thu, May 28 - Mon, Jun 1
ORD
O'Hare Intl.
DCA
Ronald Reagan Washington National
$254 Roundtrip, found 7 hours ago
$254
Roundtrip
found 7 hours ago
Select United flight, departing Thu, May 28 from O'Hare Intl. to Ronald Reagan Washington National, returning Mon, Jun 1, priced at $254 found 7 hours ago