United Flight 4728 Deals & Information (2025/2026)

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United Flight 4728 Route Deals From $217

The cheapest prices found with in the last 7 days for return flights were $189 and $217 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jul 11 - Sun, Jul 13
BIL
Logan Intl.
DEN
Denver Intl.
$189 Roundtrip, found 3 hours ago
$189
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Jul 11 from Logan Intl. to Denver Intl., returning Sun, Jul 13, priced at $189 found 3 hours ago
Thu, Sep 4 - Sat, Sep 6
BIL
Logan Intl.
DEN
Denver Intl.
$194 Roundtrip, found 1 day ago
$194
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from Logan Intl. to Denver Intl., returning Sat, Sep 6, priced at $194 found 1 day ago
Tue, Jun 24 - Tue, Jul 8
BIL
Logan Intl.
DEN
Denver Intl.
$197 Roundtrip, found 2 days ago
$197
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jun 24 from Logan Intl. to Denver Intl., returning Tue, Jul 8, priced at $197 found 2 days ago
Fri, Jul 11 - Sun, Jul 13
BIL
Logan Intl.
DEN
Denver Intl.
$219 Roundtrip, found 3 hours ago
$219
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Jul 11 from Logan Intl. to Denver Intl., returning Sun, Jul 13, priced at $219 found 3 hours ago
Tue, Jun 24 - Tue, Jul 8
BIL
Logan Intl.
DEN
Denver Intl.
$222 Roundtrip, found 2 days ago
$222
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jun 24 from Logan Intl. to Denver Intl., returning Tue, Jul 8, priced at $222 found 2 days ago
Thu, Sep 4 - Sat, Sep 6
BIL
Logan Intl.
DEN
Denver Intl.
$254 Roundtrip, found 1 day ago
$254
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from Logan Intl. to Denver Intl., returning Sat, Sep 6, priced at $254 found 1 day ago
Sat, Jul 26 - Mon, Jul 28
BIL
Logan Intl.
DEN
Denver Intl.
$255 Roundtrip, found 5 days ago
$255
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jul 26 from Logan Intl. to Denver Intl., returning Mon, Jul 28, priced at $255 found 5 days ago
Tue, Jun 24 - Tue, Jul 8
BIL
Logan Intl.
DEN
Denver Intl.
$258 Roundtrip, found 2 days ago
$258
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jun 24 from Logan Intl. to Denver Intl., returning Tue, Jul 8, priced at $258 found 2 days ago
Thu, Sep 4 - Sat, Sep 6
BIL
Logan Intl.
DEN
Denver Intl.
$259 Roundtrip, found 1 day ago
$259
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from Logan Intl. to Denver Intl., returning Sat, Sep 6, priced at $259 found 1 day ago
Tue, Jun 24 - Tue, Jul 8
BIL
Logan Intl.
DEN
Denver Intl.
$263 Roundtrip, found 2 days ago
$263
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jun 24 from Logan Intl. to Denver Intl., returning Tue, Jul 8, priced at $263 found 2 days ago
Thu, Sep 4 - Sat, Sep 6
BIL
Logan Intl.
DEN
Denver Intl.
$264 Roundtrip, found 1 day ago
$264
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from Logan Intl. to Denver Intl., returning Sat, Sep 6, priced at $264 found 1 day ago
Sat, Jul 26 - Mon, Jul 28
BIL
Logan Intl.
DEN
Denver Intl.
$266 Roundtrip, found 5 days ago
$266
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jul 26 from Logan Intl. to Denver Intl., returning Mon, Jul 28, priced at $266 found 5 days ago
Fri, Jul 11 - Sun, Jul 13
BIL
Logan Intl.
DEN
Denver Intl.
$266 Roundtrip, found 3 hours ago
$266
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Jul 11 from Logan Intl. to Denver Intl., returning Sun, Jul 13, priced at $266 found 3 hours ago
Tue, Jun 24 - Tue, Jul 8
BIL
Logan Intl.
DEN
Denver Intl.
$268 Roundtrip, found 2 days ago
$268
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jun 24 from Logan Intl. to Denver Intl., returning Tue, Jul 8, priced at $268 found 2 days ago
Thu, Aug 28 - Sun, Sep 21
BIL
Logan Intl.
DEN
Denver Intl.
$268 Roundtrip, found 2 days ago
$268
Roundtrip
found 2 days ago
Select United flight, departing Thu, Aug 28 from Logan Intl. to Denver Intl., returning Sun, Sep 21, priced at $268 found 2 days ago
Fri, Sep 12 - Sun, Sep 14
BIL
Logan Intl.
DEN
Denver Intl.
$273 Roundtrip, found 4 days ago
$273
Roundtrip
found 4 days ago
Select United flight, departing Fri, Sep 12 from Logan Intl. to Denver Intl., returning Sun, Sep 14, priced at $273 found 4 days ago

Frequently asked questions

What route does flight number UA4728 take?
UA4728 is used on a range of routes. More commonly, UA4728 flies straight from Boise Airport (BOI) to SFO. If you have a ticket on this route, you’ll be airborne for about 1 hour and 55 minutes.
What kind of plane is on flight number UA4728?
There’s every chance you’ll be on board a Bombardier CRJ if you’ve booked a fare from BOI to San Francisco Airport, one of a few routes used for flight UA4728.
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 UA4728 flight with Travelocity, please visit our Customer Service Portal.