United Flight 2104 Deals & Information (2025/2026)

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United Flight 2104 Route Deals From $70

The cheapest prices found with in the last 7 days for return flights were $137 and $70 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 4 - Thu, Sep 11
ORD
O'Hare Intl.
BOS
Logan Intl.
$137 Roundtrip, found 4 hours ago
$137
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Logan Intl., returning Thu, Sep 11, priced at $137 found 4 hours ago
Thu, Sep 4 - Thu, Sep 11
ORD
O'Hare Intl.
BOS
Logan Intl.
$139 Roundtrip, found 4 hours ago
$139
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Logan Intl., returning Thu, Sep 11, priced at $139 found 4 hours ago
Tue, Sep 16 - Fri, Sep 19
ORD
O'Hare Intl.
BOS
Logan Intl.
$149 Roundtrip, found 5 days ago
$149
Roundtrip
found 5 days ago
Select United flight, departing Tue, Sep 16 from O'Hare Intl. to Logan Intl., returning Fri, Sep 19, priced at $149 found 5 days ago
Mon, Sep 15 - Fri, Sep 19
ORD
O'Hare Intl.
BOS
Logan Intl.
$153 Roundtrip, found 16 hours ago
$153
Roundtrip
found 16 hours ago
Select United flight, departing Mon, Sep 15 from O'Hare Intl. to Logan Intl., returning Fri, Sep 19, priced at $153 found 16 hours ago
Fri, Oct 24 - Fri, Oct 31
ORD
O'Hare Intl.
BOS
Logan Intl.
$155 Roundtrip, found 6 hours ago
$155
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Oct 24 from O'Hare Intl. to Logan Intl., returning Fri, Oct 31, priced at $155 found 6 hours ago
Sun, Aug 31 - Tue, Sep 2
ORD
O'Hare Intl.
BOS
Logan Intl.
$155 Roundtrip, found 6 hours ago
$155
Roundtrip
found 6 hours ago
Select United flight, departing Sun, Aug 31 from O'Hare Intl. to Logan Intl., returning Tue, Sep 2, priced at $155 found 6 hours ago
Tue, Jul 22 - Thu, Jul 24
ORD
O'Hare Intl.
BOS
Logan Intl.
$158 Roundtrip, found 3 hours ago
$158
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Jul 22 from O'Hare Intl. to Logan Intl., returning Thu, Jul 24, priced at $158 found 3 hours ago
Fri, Oct 3 - Mon, Oct 6
ORD
O'Hare Intl.
BOS
Logan Intl.
$161 Roundtrip, just found
$161
Roundtrip
just found
Select United flight, departing Fri, Oct 3 from O'Hare Intl. to Logan Intl., returning Mon, Oct 6, priced at $161 just found
Sun, Aug 31 - Tue, Sep 2
ORD
O'Hare Intl.
BOS
Logan Intl.
$165 Roundtrip, found 6 hours ago
$165
Roundtrip
found 6 hours ago
Select United flight, departing Sun, Aug 31 from O'Hare Intl. to Logan Intl., returning Tue, Sep 2, priced at $165 found 6 hours ago
Fri, Oct 3 - Mon, Oct 6
ORD
O'Hare Intl.
BOS
Logan Intl.
$172 Roundtrip, just found
$172
Roundtrip
just found
Select United flight, departing Fri, Oct 3 from O'Hare Intl. to Logan Intl., returning Mon, Oct 6, priced at $172 just found
Wed, Jul 9 - Tue, Jul 15
ORD
O'Hare Intl.
BOS
Logan Intl.
$173 Roundtrip, found 9 hours ago
$173
Roundtrip
found 9 hours ago
Select United flight, departing Wed, Jul 9 from O'Hare Intl. to Logan Intl., returning Tue, Jul 15, priced at $173 found 9 hours ago
Thu, Sep 4 - Thu, Sep 11
ORD
O'Hare Intl.
BOS
Logan Intl.
$175 Roundtrip, found 4 hours ago
$175
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Logan Intl., returning Thu, Sep 11, priced at $175 found 4 hours ago
Fri, Oct 3 - Mon, Oct 6
ORD
O'Hare Intl.
BOS
Logan Intl.
$179 Roundtrip, just found
$179
Roundtrip
just found
Select United flight, departing Fri, Oct 3 from O'Hare Intl. to Logan Intl., returning Mon, Oct 6, priced at $179 just found

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.