In general, February is the cheapest month to fly from Ireland to Phoenix. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around 435€. If you don’t want to visit Phoenix in February, then you should wait until March to fly from Ireland, when ticket prices are also cheap, with an average price of 447€.
The best time to book a flight to Phoenix from Ireland is 60 days out, which is when prices tend to be around 553€. Keep in mind that you might also find cheap flights to Phoenix outside of this time window. In fact, momondo users recently found flights from Ireland to Phoenix for 544€.
The cheapest day to depart on your flight to Phoenix is on a Tuesday when prices can be found for as low as 545€. This is often the case because there is less demand to fly during this day of the week. Flights from Ireland to Phoenix on a Saturday will generally be more expensive and average around 676€. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
The cheapest time of day to fly to Phoenix is in the evening when flights can be purchased for as low as 471€. If you have a flexible travel schedule, then try to avoid flying at midday when prices are 659€ on average. Flights to Phoenix from Ireland at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.