United Flight 2104 Deals & Information (2026/2027)

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United Flight 2104 Route Deals From $108

The cheapest prices found with in the last 7 days for return flights were $135 and $108 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Aug 25 - Tue, Sep 1
ORD
O'Hare Intl.
BOS
Logan Intl.
$135 Roundtrip, found 21 hours ago
$135
Roundtrip
found 21 hours ago
Select United flight, departing Tue, Aug 25 from O'Hare Intl. to Logan Intl., returning Tue, Sep 1, priced at $135 found 21 hours ago
Thu, Sep 10 - Tue, Sep 15
ORD
O'Hare Intl.
BOS
Logan Intl.
$151 Roundtrip, found 21 hours ago
$151
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Logan Intl., returning Tue, Sep 15, priced at $151 found 21 hours ago
Thu, Sep 10 - Tue, Sep 15
ORD
O'Hare Intl.
BOS
Logan Intl.
$155 Roundtrip, found 21 hours ago
$155
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Logan Intl., returning Tue, Sep 15, priced at $155 found 21 hours ago
Tue, Aug 25 - Tue, Sep 1
ORD
O'Hare Intl.
BOS
Logan Intl.
$161 Roundtrip, found 21 hours ago
$161
Roundtrip
found 21 hours ago
Select United flight, departing Tue, Aug 25 from O'Hare Intl. to Logan Intl., returning Tue, Sep 1, priced at $161 found 21 hours ago
Tue, Aug 18 - Fri, Aug 21
ORD
O'Hare Intl.
BOS
Logan Intl.
$163 Roundtrip, found 12 hours ago
$163
Roundtrip
found 12 hours ago
Select United flight, departing Tue, Aug 18 from O'Hare Intl. to Logan Intl., returning Fri, Aug 21, priced at $163 found 12 hours ago
Tue, Aug 18 - Fri, Aug 21
ORD
O'Hare Intl.
BOS
Logan Intl.
$167 Roundtrip, found 12 hours ago
$167
Roundtrip
found 12 hours ago
Select United flight, departing Tue, Aug 18 from O'Hare Intl. to Logan Intl., returning Fri, Aug 21, priced at $167 found 12 hours ago
Wed, Jun 10 - Mon, Jun 15
ORD
O'Hare Intl.
BOS
Logan Intl.
$168 Roundtrip, found 18 hours ago
$168
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Jun 10 from O'Hare Intl. to Logan Intl., returning Mon, Jun 15, priced at $168 found 18 hours ago

Frequently asked questions

What route does flight number UA2104 take?
Flight number UA2104 takes approximately 3 hours and 59 minutes to fly straight from National Airport to DEN. We all know there's magic in the destination, but the journey is always half the fun!
How often is UA2104 on time?
If you're traveling with United Airlines flight number UA2104 between Ronald Reagan Washington National Airport (DCA) and Denver, CO Airport (DEN-Denver Intl.), it's a good thing to know that 85% of these flights reach their destination on time. In the rare event of a delay, you can expect an average wait time of roughly 18 minutes. This service has a 3.5-star rating.
What terminal does UA2104 fly out of?
Flights between Ronald Reagan Washington National Airport (DCA) and DIA airport are served by flight number UA2104, and passengers booked on this route typically take off from Terminal B.
What kind of plane is on flight number UA2104?
The Airbus A319 is the plane that's mostly used for flight UA2104. More often than not, this flight departs from Washington, DC Airport (DCA-Ronald Reagan Washington National) and arrives at Denver Intl. Airport (DEN).
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA2104 flight with Travelocity, please visit our Customer Service Portal.