Cheap flights from Ireland to Brussels from €18

In general, January is the cheapest month to fly from Ireland to Brussels Bruxelles-National Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around €64. If you aren’t able to travel to Brussels Bruxelles-National Airport during the month of January, then flying in August is also cheap. Prices for this month can be found on momondo for an average of €86.

The cheapest day to depart on your flight to Brussels Bruxelles-National Airport is on a Thursday when prices can be found for as low as €103. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Brussels Bruxelles-National Airport on Sunday is €160.

Our data shows that the cheapest Ireland to Brussels Bruxelles-National Airport flights are usually those with departure times in the afternoon. Our users have found flights to Brussels Bruxelles-National Airport in the afternoon for as low as €113. Flights to Brussels Bruxelles-National Airport are more costly at midday, with an average ticket price of €160. Departure times at midday fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Brussels Bruxelles-National Airport from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Brussels Bruxelles-National Airport for around €110 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Brussels Bruxelles-National Airport from Ireland for as low as €75 on momondo.

There is only 1 cabin class available to choose from on Ireland to Brussels Bruxelles-National Airport 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 Brussels have experienced a delay on any given week. The average delay length over the past 12 months has been 108 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 11% of their flights experiencing any sort of delay.

The number of flights available between Ireland and Brussels Bruxelles-National Airport is 5 per day as of July 2026. The most frequent departure time is 06:00, with 58% of daily flights leaving at midday.

As of July 2026, there are 40 flights per week flying from Ireland to Brussels Bruxelles-National Airport. The most common day of the week flights depart is Wed, with 20% of flights taking off on this day.