Cheap flights from Ireland to Portugal from €18

The month of January is, on average, the cheapest month to fly to Portugal from Ireland, with most prices found around €112. If you’re not able to fly to Portugal in January, then November is your next best option. Flight prices from Ireland to Portugal during November average around €128.

The cheapest day to depart from Ireland to Portugal is on a Sunday when prices can be found for as low as €332. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €971. These prices are subject to change though, so be sure to set up a Price Alert for flights to Portugal.

Our most recent data shows that the best time of day to fly to Portugal is at midday. Flights from Ireland to Portugal during this time can be as low as €80. Flights to Portugal are more costly in the evening, with an average ticket price of €987. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Shannon to Porto for the best Ireland - Portugal flight prices

You are more likely to see cheaper flights to Portugal from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around €165 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Ireland for as low as €139 on momondo.

There are 3 cabin classes available to choose from on Ireland to Portugal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Ryanair and KLM are the most popular carriers operating from Ireland to Portugal

Ryanair, Aer Lingus and TAP AIR PORTUGAL are the top three most popular airlines that fly to Portugal from Ireland according to our data. Ryanair is the first choice among our users, with 61% of people opting to fly with this airline when travelling to Portugal. Keep in mind that there are 4 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

Historically, on average around 19% of flights between Ireland and Portugal have experienced a delay on any given week. The average delay length over the past 12 months has been 109 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, Aer Lingus have had the fewest delays on this route over the last 12 months, with about 11% of their flights experiencing any sort of delay.

As of July 2026, 13 flights take off from Ireland and land in Portugal each day. The most common flight departure time for this route is 18:00, with 45% of daily flights taking off at midday.

The number of flights available between Ireland and Portugal is 94 per week as of July 2026. The most frequent departure day is Thu, with 26% of weekly flights leaving on this day.