Cheap flights from Ireland to Belgium from £17

The month of January is, on average, the cheapest month to fly to Belgium from Ireland, with most prices found around £55. If you aren’t able to travel during the month of January, then book flights to Belgium from Ireland during September instead. Flights to Belgium in September, while not as cheap as those in January, still average around £57.

The cheapest day to depart from Ireland to Belgium is on a Sunday when prices can be found for as low as £60. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Belgium on Saturday is £98.

Our most recent data shows that the best time of day to fly to Belgium is in the afternoon. Flights from Ireland to Belgium during this time can be as low as £67. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are £79 on average. Flights to Belgium from Ireland in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 £85 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 £63 on momondo.

There is only 1 cabin class available to choose from on Ireland to Belgium flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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.

As of March 2026, there are 5 flights per day flying from Ireland to Belgium. The most common time of day flights depart is 06:00, with 63% of flights taking off at midday.

39 flights are operational weekly from Ireland to Belgium as of March 2026. The most popular departure day for this route is Fri, with 26% of flights per week taking off on this day.