United Flight 577 Deals & Information (2026/2027)

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United Flight 577 Route Deals From $90

The cheapest prices found with in the last 7 days for return flights were $189 and $90 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Apr 29 - Thu, Apr 30
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$189 Roundtrip, found 5 hours ago
$189
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Apr 29 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, Apr 30, priced at $189 found 5 hours ago
Wed, May 13 - Fri, May 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$193 Roundtrip, found 2 hours ago
$193
Roundtrip
found 2 hours ago
Select United flight, departing Wed, May 13 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, May 15, priced at $193 found 2 hours ago
Fri, Sep 4 - Sun, Sep 6
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$197 Roundtrip, found 5 hours ago
$197
Roundtrip
found 5 hours ago
Select United flight, departing Fri, Sep 4 from Newark Liberty Intl. Airport to Logan Intl., returning Sun, Sep 6, priced at $197 found 5 hours ago
Wed, Apr 29 - Thu, Apr 30
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$201 Roundtrip, found 5 hours ago
$201
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Apr 29 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, Apr 30, priced at $201 found 5 hours ago
Wed, May 13 - Fri, May 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$205 Roundtrip, found 2 hours ago
$205
Roundtrip
found 2 hours ago
Select United flight, departing Wed, May 13 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, May 15, priced at $205 found 2 hours ago
Sun, May 17 - Mon, May 18
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$207 Roundtrip, found 2 days ago
$207
Roundtrip
found 2 days ago
Select United flight, departing Sun, May 17 from Newark Liberty Intl. Airport to Logan Intl., returning Mon, May 18, priced at $207 found 2 days ago
Wed, Apr 22 - Thu, Apr 23
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$209 Roundtrip, found 1 hour ago
$209
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Apr 22 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, Apr 23, priced at $209 found 1 hour ago
Wed, May 13 - Fri, May 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$210 Roundtrip, found 2 hours ago
$210
Roundtrip
found 2 hours ago
Select United flight, departing Wed, May 13 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, May 15, priced at $210 found 2 hours ago
Thu, May 7 - Fri, May 8
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$211 Roundtrip, found 1 hour ago
$211
Roundtrip
found 1 hour ago
Select United flight, departing Thu, May 7 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, May 8, priced at $211 found 1 hour ago
Tue, May 26 - Thu, May 28
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$212 Roundtrip, found 6 days ago
$212
Roundtrip
found 6 days ago
Select United flight, departing Tue, May 26 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, May 28, priced at $212 found 6 days ago
Wed, May 13 - Fri, May 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$213 Roundtrip, found 2 hours ago
$213
Roundtrip
found 2 hours ago
Select United flight, departing Wed, May 13 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, May 15, priced at $213 found 2 hours ago

Frequently asked questions

What route does flight number UA577 take?
UA577 travels from DEN to GEG directly. This service generally takes 2 hours and 24 minutes.
How often is UA577 on time?
Roughly 90% of UA577 flights arrive according to scheduled times — so if you're jetting from Denver, CO Airport (DEN-Denver Intl.) to GEG, you can be confident that you'll touch down at your destination ASAP. In the rare event that your United Airlines trip is delayed, you can expect to wait about 8 minutes. Because of the air carrier's top-notch service, this route has a star rating of 4.6.
What kind of plane is on flight number UA577?
The Boeing 737-800 is the kind of plane that's mostly used for flight number UA577. This flight almost always sets off from DEN and comes in to land at GEG.
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 UA577 flight with Travelocity, please visit our Customer Service Portal.