In general, when looking for the cheapest flight to Lyon, try to choose a flight departing in January for the best deal.
In general, most flyers find the cheapest time to book a flight to Lyon is about 60 days prior.
In general, booking your departure to Lyon for a Wednesday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
Typically, cheap prices to Lyon are most often found for morning flights. Cheap prices are less likely for afternoon flights.