In general, November is the cheapest month to fly from Ireland to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around 78€. If you aren’t able to travel to Lisbon during the month of November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of 79€.
The ideal time to book your flight to Lisbon is 60 days in advance, when prices tend to average 103€. However, in the past 72 hours, people saw flights from Ireland for as low as 18€.
The cheapest day to depart from Ireland to Lisbon is on a Tuesday. Travellers who choose to depart for Lisbon on a Tuesday will often find tickets for as low as 88€. On the other hand, Friday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travellers. As a result, prices tend to be around 138€.
At midday is the cheapest time of day to fly from Ireland to Lisbon when you can find flight prices for as low as 91€. Flying to Lisbon at midday is an ideal time because this is during off-peak travel hours. In the evening is when there is more demand to fly to Lisbon, so prices are often more expensive at around 129€ per ticket.
Those flying to Lisbon could potentially find better pricing at Cascais Aerodrome Airport (19 km from Lisbon city centre), depending on the month and departure airport.