Cheap flights from the United Kingdom to Ireland from €18

The month of September is another great option to travel to Ireland, with average flight prices from United Kingdom averaging around €64.

The cheapest day to depart on your flight to Ireland is on a Sunday when prices can be found for as low as €158. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €266. These prices are subject to change though, so be sure to set up a Price Alert for flights to Ireland.

At midday is the cheapest time of day to fly from United Kingdom to Ireland when you can find flight prices for as low as €109. Flying to Ireland at midday is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Ireland is in the morning when prices are around €173.

Fly from London Luton to Knock Intl for the best United Kingdom - Ireland flight prices

You are more likely to see cheaper flights to Ireland from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around €153 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from United Kingdom for as low as €119 on momondo.

There are 2 cabin classes available to choose from on United Kingdom to Ireland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Ryanair, British Airways, and Vueling are the most popular carriers operating from United Kingdom to Ireland

British Airways, Aer Lingus and Ryanair are the top three most popular airlines that fly to Ireland from United Kingdom according to our data. British Airways is the first choice among our users, with 48% of people opting to fly with this airline when travelling to Ireland. Keep in mind that there are 3 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 19% of flights between United Kingdom and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 99 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon 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, British Airways have had the fewest delays on this route over the last 12 months, with about 14% of their flights experiencing any sort of delay.

As of March 2026, 152 flights take off from United Kingdom and land in Ireland each day. The most common flight departure time for this route is 08:00, with 42% of daily flights taking off at midday.

The number of flights available between United Kingdom and Ireland is 1,068 per week as of March 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.