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 - Sun, Jul 12
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$157 Roundtrip, found 2 hours ago
$157
Roundtrip
found 2 hours ago
Select United flight, departing Fri, Jul 10 from Newark Liberty Intl. Airport to Logan Intl., returning Sun, Jul 12, priced at $157 found 2 hours ago
Thu, Jun 11 - Sat, Jun 13
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$161 Roundtrip, found 11 hours ago
$161
Roundtrip
found 11 hours ago
Select United flight, departing Thu, Jun 11 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jun 13, priced at $161 found 11 hours ago
Sat, Aug 8 - Sat, Aug 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$169 Roundtrip, found 3 days ago
$169
Roundtrip
found 3 days ago
Select United flight, departing Sat, Aug 8 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Aug 15, priced at $169 found 3 days ago
Mon, Aug 17 - Tue, Aug 18
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$170 Roundtrip, found 3 days ago
$170
Roundtrip
found 3 days ago
Select United flight, departing Mon, Aug 17 from Newark Liberty Intl. Airport to Logan Intl., returning Tue, Aug 18, priced at $170 found 3 days ago
Sat, Jul 18 - Sat, Jul 25
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$174 Roundtrip, found 7 hours ago
$174
Roundtrip
found 7 hours ago
Select United flight, departing Sat, Jul 18 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jul 25, priced at $174 found 7 hours ago
Sat, Jul 18 - Sat, Jul 25
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$180 Roundtrip, found 7 hours ago
$180
Roundtrip
found 7 hours ago
Select United flight, departing Sat, Jul 18 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jul 25, priced at $180 found 7 hours ago
Sat, Aug 8 - Sat, Aug 15
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$181 Roundtrip, found 3 days ago
$181
Roundtrip
found 3 days ago
Select United flight, departing Sat, Aug 8 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Aug 15, priced at $181 found 3 days ago
Sat, May 16 - Mon, May 18
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$182 Roundtrip, found 2 hours ago
$182
Roundtrip
found 2 hours ago
Select United flight, departing Sat, May 16 from Newark Liberty Intl. Airport to Logan Intl., returning Mon, May 18, priced at $182 found 2 hours ago
Sat, Jul 18 - Sat, Jul 25
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$187 Roundtrip, found 7 hours ago
$187
Roundtrip
found 7 hours ago
Select United flight, departing Sat, Jul 18 from Newark Liberty Intl. Airport to Logan Intl., returning Sat, Jul 25, priced at $187 found 7 hours ago
Tue, May 26 - Thu, May 28
EWR
Newark Liberty Intl. Airport
BOS
Logan Intl.
$189 Roundtrip, found 1 day ago
$189
Roundtrip
found 1 day ago
Select United flight, departing Tue, May 26 from Newark Liberty Intl. Airport to Logan Intl., returning Thu, May 28, priced at $189 found 1 day 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.