United Flight 577 Deals & Information (2026/2027)

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United Flight 577 Route Deals From $147

The cheapest prices found with in the last 7 days for return flights were $264 and $147 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 4 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$264 Roundtrip, found 1 day ago
$264
Roundtrip
found 1 day ago
Select United flight, departing Fri, Dec 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $264 found 1 day ago
Wed, Dec 2 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$268 Roundtrip, found 1 day ago
$268
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 2 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $268 found 1 day ago
Wed, Dec 2 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$270 Roundtrip, found 1 day ago
$270
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 2 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $270 found 1 day ago
Fri, Dec 4 - Wed, Dec 9
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$274 Roundtrip, found 1 day ago
$274
Roundtrip
found 1 day ago
Select United flight, departing Fri, Dec 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Wed, Dec 9, priced at $274 found 1 day ago
Wed, Dec 2 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 2 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $279 found 1 day ago
Fri, Dec 4 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select United flight, departing Fri, Dec 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $279 found 1 day ago
Tue, Nov 10 - Fri, Nov 13
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$281 Roundtrip, found 3 days ago
$281
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 10 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Fri, Nov 13, priced at $281 found 3 days ago
Tue, Nov 10 - Fri, Nov 13
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$282 Roundtrip, found 3 days ago
$282
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 10 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Fri, Nov 13, priced at $282 found 3 days ago
Wed, Dec 2 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$285 Roundtrip, found 1 day ago
$285
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 2 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $285 found 1 day ago
Fri, Dec 4 - Wed, Dec 9
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$289 Roundtrip, found 1 day ago
$289
Roundtrip
found 1 day ago
Select United flight, departing Fri, Dec 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Wed, Dec 9, priced at $289 found 1 day ago
Fri, Dec 4 - Mon, Dec 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$292 Roundtrip, found 1 day ago
$292
Roundtrip
found 1 day ago
Select United flight, departing Fri, Dec 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Dec 7, priced at $292 found 1 day ago
Wed, Nov 4 - Sat, Nov 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$293 Roundtrip, found 16 hours ago
$293
Roundtrip
found 16 hours ago
Select United flight, departing Wed, Nov 4 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Sat, Nov 7, priced at $293 found 16 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.