United Flight 577 Deals & Information (2026/2027)

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United Flight 577 Route Deals From $79

The cheapest prices found with in the last 7 days for return flights were $157 and $79 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jul 10 - Sat, Jul 11
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Jul 10 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jul 11, priced at $157 found 1 hour ago
Thu, Jun 11 - Fri, Jun 12
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$161 Roundtrip, found 13 hours ago
$161
Roundtrip
found 13 hours ago
Select United flight, departing Thu, Jun 11 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, Jun 12, priced at $161 found 13 hours ago
Tue, May 26 - Wed, May 27
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$167 Roundtrip, found 1 day ago
$167
Roundtrip
found 1 day ago
Select United flight, departing Tue, May 26 from Newark Liberty Intl. Airport to Logan Intl., returning Wed, May 27, priced at $167 found 1 day ago
Fri, Jul 10 - Sat, Jul 11
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$174 Roundtrip, found 1 hour ago
$174
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Jul 10 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jul 11, priced at $174 found 1 hour ago
Mon, Jul 27 - Tue, Jul 28
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$180 Roundtrip, found 21 hours ago
$180
Roundtrip
found 21 hours ago
Select United flight, departing Mon, Jul 27 from Newark Liberty Intl. Airport to Logan Intl., returning Tue, Jul 28, priced at $180 found 21 hours ago
Mon, Jun 8 - Fri, Jun 12
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$181 Roundtrip, found 20 hours ago
$181
Roundtrip
found 20 hours ago
Select United flight, departing Mon, Jun 8 from Newark Liberty Intl. Airport to Logan Intl., returning Fri, Jun 12, priced at $181 found 20 hours ago
Tue, May 26 - Wed, May 27
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$182 Roundtrip, found 1 day ago
$182
Roundtrip
found 1 day ago
Select United flight, departing Tue, May 26 from Newark Liberty Intl. Airport to Logan Intl., returning Wed, May 27, priced at $182 found 1 day ago
Sat, Aug 15 - Tue, Aug 18
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$185 Roundtrip, found 4 hours ago
$185
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Aug 15 from Newark Liberty Intl. Airport to Logan Intl., returning Tue, Aug 18, priced at $185 found 4 hours ago
Sat, Aug 8 - Sat, Aug 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$192 Roundtrip, found 21 hours ago
$192
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Aug 8 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Aug 15, priced at $192 found 21 hours ago
Mon, May 25 - Thu, May 28
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$192 Roundtrip, found 3 days ago
$192
Roundtrip
found 3 days ago
Select United flight, departing Mon, May 25 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, May 28, priced at $192 found 3 days 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.