Cheap flights from Ireland to the United Kingdom from €15

The month of September is, on average, the cheapest month to fly to United Kingdom from Ireland, with most prices found around €80. The month of January is another great option to travel to United Kingdom, with average flight prices from Ireland averaging around €88.

The cheapest day to depart on your flight to United Kingdom is on a Friday when prices can be found for as low as €218. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travellers. As a result, prices tend to be around €595.

Flying to United Kingdom from Ireland in the evening is the least expensive time of day to depart. momondo users have found prices as low as €156 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to United Kingdom, so prices are often more expensive at around €741 per ticket.

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

You are more likely to see cheaper flights to United Kingdom from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around €150 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Ireland for as low as €111 on momondo.

There are 4 cabin classes available to choose from on Ireland to United Kingdom flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

Ryanair, Aer Lingus and British Airways are the top three most popular airlines that fly to United Kingdom from Ireland according to our data. Ryanair is the first choice among our users, with 65% of people opting to fly with this airline when travelling to United Kingdom. Keep in mind that there are 3 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between Ireland and United Kingdom 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, Aer Lingus have had the fewest delays on this route over the last 12 months, with about 15% of their flights experiencing any sort of delay.

155 flights are operational daily from Ireland to United Kingdom as of November 2026. The most popular departure time for this route is 07:00, with 49% of flights per day taking off at midday.

The number of flights available between Ireland and United Kingdom is 1,085 per week as of November 2026. The most frequent departure day is Fri, with 19% of weekly flights leaving on this day.