Cheap flights from London to Ireland from €17

The month of September is another great option to travel to Ireland, with average flight prices from London averaging around €81.

The cheapest day to depart on your flight to Ireland is on a Saturday when prices can be found for as low as €112. 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 €262. 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 London to Ireland when you can find flight prices for as low as €107. 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 afternoon when prices are around €193.

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

You are more likely to see cheaper flights to Ireland from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around €152 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 London for as low as €111 on momondo.

There are 3 cabin classes available to choose from on London to Ireland 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 17% of flights between London and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 103 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. 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 12% of their flights experiencing any sort of delay.

The number of flights available between London and Ireland is 106 per day as of May 2026. The most frequent departure time is 09:00, with 39% of daily flights leaving at midday.

The number of flights available between London and Ireland is 746 per week as of May 2026. The most frequent departure day is Fri, with 19% of weekly flights leaving on this day.