United just announced a Twitter deal to Australia, 40% off (for real) to Australia in October and November.
These deals usually don’t last long, just a couple of hours, although at times continuing to enter the promotion code will continue to work (at times even for a couple of days!) long after the deal ‘ends’ on the landing page for the offer.
In this case, the promo code is TWRAU.
These fares do earn miles, but are not ugpradable with United 1K Systemwide vouchers.
Fares aren’t as low as a month ago when United made a similar 40% off offer, but that’s a function of the calendar — October and November are more expensive months to fly to Sydney than August/September.