Cheap flights from Ireland to Belgium from €18

The month of October is, on average, the cheapest month to fly to Belgium from Ireland, with most prices found around €15. If you don’t want to visit Belgium in October, then you should wait until August to fly from Ireland, when ticket prices are also cheap, with an average price of €15.

The cheapest day to depart from Ireland to Belgium is on a Thursday when prices can be found for as low as €116. Flights from Ireland to Belgium on a Sunday will generally be more expensive and average around €157. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Belgium is in the afternoon. momondo users have found flights departing from Ireland to Belgium in the afternoon for as low as €113. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. At midday is when there is more demand to fly to Belgium, so prices are often more expensive at around €149 per ticket.

Fly from Dublin to Brussels Bruxelles-National for the best Ireland - Belgium flight prices

You are more likely to see cheaper flights to Belgium from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Belgium for around €103 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Belgium from Ireland for as low as €71 on momondo.

Historically, on average around 14% of flights between Ireland and Belgium have experienced a delay on any given week. The average delay length over the past 12 months has been 105 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.

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday 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 9% of their flights experiencing any sort of delay.

The number of flights available between Ireland and Belgium is 6 per day as of May 2026. The most frequent departure time is 06:00, with 56% of daily flights leaving at midday.

As of May 2026, there are 48 flights per week flying from Ireland to Belgium. The most common day of the week flights depart is Fri, with 21% of flights taking off on this day.