Skyteam Alliance member China Eastern has dropped airfare to $676 round trip from Los Angeles to Singapore for departures from September to November 2015. This is the only time I recall the fare dropping below $720 this year. This low fare is available on 50 of 74 dates from September 1 to November 13.
San Francisco departures are priced at $724 during the same September to November period, but there are fewer dates.
China Eastern routes flights through it Shanghai PVG hub.
Los Angeles LAX – Shanghai PVG – Singapore SIN
$675.80 on Priceline.com September 2 – September 9
These flights are booked in China Eastern economy booking class Q, which is not a miles earning fare with Delta SkyMiles. The route is flown on Boeing 777 aircraft between LAX and Shanghai and Airbus 330 between Shanghai and Singapore.
This fare is not a good fare for Delta SkyMiles earners, but a good low fare for flights to Singapore, if miles are not your top consideration.