Cheap flights from Ireland to the United Kingdom from £13

The cheapest month to fly to United Kingdom from Ireland is in September. Flight prices, which tend to average around £67, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of September, then departing from Ireland during the month April is also very affordable. Most momondo users find prices during this month for around £75.

The cheapest day to depart from Ireland to United Kingdom is on a Friday. Travellers who choose to depart for United Kingdom on a Friday will often find tickets for as low as £272. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ireland to United Kingdom for around £602.

The cheapest time of day to fly to United Kingdom is in the evening when flights can be purchased for as low as £162. Try not to purchase tickets in the afternoon because they tend to be around £652. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 £128 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 £110 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 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 67% 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.

136 flights are operational daily from Ireland to United Kingdom as of October 2026. The most popular departure time for this route is 07:00, with 54% of flights per day taking off at midday.

The number of flights available between Ireland and United Kingdom is 957 per week as of October 2026. The most frequent departure day is Fri, with 22% of weekly flights leaving on this day.