United Flight UA3635 Deals & Information (2025/2026)

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United Flight 3635 Route Deals From $99

The cheapest prices found with in the last 7 days for return flights were $188 and $99 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Sep 5 - Sun, Sep 7
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$188 Roundtrip, found 1 hour ago
$188
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Sep 5 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Sun, Sep 7, priced at $188 found 1 hour ago
Sat, Nov 8 - Mon, Nov 10
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$197 Roundtrip, found 5 hours ago
$197
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Nov 8 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Nov 10, priced at $197 found 5 hours ago
Sat, Nov 8 - Mon, Nov 10
STL
Lambert-St. Louis Intl.
EWR
Newark Liberty Intl. Airport
$203 Roundtrip, found 5 hours ago
$203
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Nov 8 from Lambert-St. Louis Intl. to Newark Liberty Intl. Airport, returning Mon, Nov 10, priced at $203 found 5 hours ago

Frequently asked questions

What route does flight number UA3635 take?
UA3635 flies direct between Pittsburgh, PA Airport (PIT-Pittsburgh Intl.) and O'Hare Intl. Airport (ORD) in around 1 hour and 35 minutes. It can sometimes be used on other routes though, some of which may be multi-stop flights. Keep an eye out for this when locking in your seat to avoid any confusion.
What kind of plane is on flight number UA3635?
If you're considering booking flight UA3635 from Pittsburgh Intl. Airport (PIT) to ORD, there's a strong chance you'll be traveling aboard the Embraer 175. This flight number serves a number of different routes, but this is the busiest.
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 UA3635 flight with Travelocity, please visit our Customer Service Portal.