Cheap United flights Ontario (ONT) to London (LHR)

Prices were available within the past 7 days and start at for one-way flights and $681 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Mar 23 - Tue, Mar 31

ONT

Ontario

LHR

London

$681 Roundtrip, found 9 hours ago

$681

Roundtrip

found 9 hours ago

Select United flight, departing Mon, Mar 23 from Ontario to London, returning Tue, Mar 31, priced at $681 found 9 hours ago

Mon, Mar 23 - Tue, Mar 31

ONT

Ontario

LHR

London

$881 Roundtrip, found 9 hours ago

$881

Roundtrip

found 9 hours ago

Select United flight, departing Mon, Mar 23 from Ontario to London, returning Tue, Mar 31, priced at $881 found 9 hours ago