What about this?

Your requested flight

All prices are in U.S. dollars and include taxes/fees/airport charges. All times local to each city.

1 adult Total: USD 282.75



Flight: United Airlines flight 816 on a Boeing 747 Jet
Depart: Los Angeles, CA (LAX)- Fri, May 16 1:40pm
Arrive: Chicago-Ohare, IL (ORD) - Fri, May 16 7:32pm



Flight: United Airlines flight 1022 on a Boeing 737-500 Jet
Depart: Chicago-Ohare, IL (ORD)- Fri, May 16 8:45pm
Arrive: Toronto, Canada (YYZ) - Fri, May 16 11:17pm




Flight: United Airlines flight 8441 operated by Air Canada on a Airbus Jet
Depart: Toronto, Canada (YYZ)- Sun, May 18 12:00noon
Arrive: Denver, CO (DEN) - Sun, May 18 1:38pm



Flight: United Airlines flight 1457 on a Boeing 767 Jet
Depart: Denver, CO (DEN)- Sun, May 18 2:30pm
Arrive: Los Angeles, CA (LAX) - Sun, May 18 3:48pm

I know the YYZ-DEN is AC but I am sure if you were creative you could get all UA - outbound is a 747!! AA non-stops are about $25 less.