I'd like to bid on airfare on Priceline's Name Your Price. How do I know what price to bid? I've searched the typical websites, like Expedia, Kayak, etc., to see the typical fares which are around $1,500 for the dates I need to fly. However, I've found on Skyskanner airfare for the exact dates and airport locations for $1,300. So how do I determine from this information what to bid on Priceline?