United Flight 2104 Deals & Information (2026/2027)

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United Flight 2104 Route Deals From $142

The cheapest prices found with in the last 7 days for return flights were $269 and $142 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Nov 26 - Tue, Dec 1
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$269 Roundtrip, found 10 hours ago
$269
Roundtrip
found 10 hours ago
Select United flight, departing Thu, Nov 26 from Logan Intl. to Newark Liberty Intl. Airport, returning Tue, Dec 1, priced at $269 found 10 hours ago
Sun, Dec 6 - Tue, Dec 8
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$276 Roundtrip, found 5 days ago
$276
Roundtrip
found 5 days ago
Select United flight, departing Sun, Dec 6 from Logan Intl. to Newark Liberty Intl. Airport, returning Tue, Dec 8, priced at $276 found 5 days ago
Wed, Dec 9 - Thu, Dec 10
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$277 Roundtrip, found 6 days ago
$277
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 9 from Logan Intl. to Newark Liberty Intl. Airport, returning Thu, Dec 10, priced at $277 found 6 days ago
Wed, Dec 9 - Thu, Dec 10
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$283 Roundtrip, found 6 days ago
$283
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 9 from Logan Intl. to Newark Liberty Intl. Airport, returning Thu, Dec 10, priced at $283 found 6 days ago
Wed, Dec 9 - Thu, Dec 10
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$284 Roundtrip, found 6 days ago
$284
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 9 from Logan Intl. to Newark Liberty Intl. Airport, returning Thu, Dec 10, priced at $284 found 6 days ago
Fri, Oct 16 - Sun, Oct 18
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$285 Roundtrip, found 3 hours ago
$285
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Oct 16 from Logan Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 18, priced at $285 found 3 hours ago
Sun, Oct 4 - Sun, Oct 11
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$303 Roundtrip, found 3 hours ago
$303
Roundtrip
found 3 hours ago
Select United flight, departing Sun, Oct 4 from Logan Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 11, priced at $303 found 3 hours ago
Fri, Nov 6 - Sat, Nov 7
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$306 Roundtrip, found 1 day ago
$306
Roundtrip
found 1 day ago
Select United flight, departing Fri, Nov 6 from Logan Intl. to Newark Liberty Intl. Airport, returning Sat, Nov 7, priced at $306 found 1 day ago
Sat, Oct 10 - Thu, Oct 15
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$307 Roundtrip, found 3 days ago
$307
Roundtrip
found 3 days ago
Select United flight, departing Sat, Oct 10 from Logan Intl. to Newark Liberty Intl. Airport, returning Thu, Oct 15, priced at $307 found 3 days ago
Wed, Oct 21 - Thu, Oct 22
BOS
Logan Intl.
EWR
Newark Liberty Intl. Airport
$309 Roundtrip, found 8 hours ago
$309
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Oct 21 from Logan Intl. to Newark Liberty Intl. Airport, returning Thu, Oct 22, priced at $309 found 8 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.