Fly from several US Cities to Cape Town, South Africa (CPT) for $621 round-trip on KLM Royal Dutch and Delta Airlines. This looks like a similar situation to Singapore deals we mentioned earlier today, in this case, though it is SkyTeam member KLM going after United Airline hub cities with this unadvertised sale.
Availability varies by route, but most seats are available any day of the week starting in early May. You must depart before May 31, with return flights in June available. Flights departing from San Francisco will require an overnight stay in either Amsterdam or Paris depending on your airline selection. This is a great dealt for these routes so we recommend you book quickly if you're interested. Fares listed at the $635 price point will require two connections.
As an example below, we found seats departing IAD on Monday, May 28th and returning from CPT on Thursday, June 14, 2018. Click on the fare links below for further details on these deals:
Need a place to stay while in Cape Town? Here is what is available for the listed dates on Hotelwatchdog.