Great question — answering as the UphillTech team:
A number of people will tell you different things, but I'll say Tuesday or Wednesday. Now, there are two parts to this question. Firstly, what day is the cheapest to fly , and then what day is the cheapest to buy . To fly, is generally during the week days, not Monday or Friday as people are coming back / going on trips - leisure or business. Morning/evening flights are more expensive, etc etc. Now, the key part you're asking is when do you buy. Firstly, NOT the weekends. It's been shown , and I've seen personally, that airline ticket prices will often rise on the weekend, then drop again on Monday. The theory being that more people shop for tickets on the weekend. Annoying, but there you...
Full answer by Mark Mayo: https://travel.stackexchange.com/a/11324 (CC BY-SA 3.0).
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