Cheapest flights fly out on Wednesdays or Thursday, but try searching for flights on other days of the week as well. 7 day vacations seem to the cheapest (so that you fly in and out on Wednesday), but these prices have been going down recently, so you may be able to find discounts on other days of the week as well.
Singapore Airlines is offering discount flights to Singapore from San Francisco
China Airlines has just announced a slew of discount flights to Eastern and Southeastern Asia from San Francisco. Full Details. Must fly between Monday and Thursday.
The following Asian cities are included in this announcement. Be sure to check different dates for each flight as there is quite a bit of price variation [...]
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San Francisco Deals