Cheap flights from Ireland to San Francisco from €375

The cheapest month to fly to San Francisco from Ireland is in October. Flight prices, which tend to average around €246, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to San Francisco from Ireland during March instead. Flights to San Francisco in March, while not as cheap as those in October, still average around €347.

On average, the least expensive day to fly to San Francisco from Ireland is on a Sunday. momondo users have found tickets for Sunday departures for as low as €503. However, this price may fluctuate depending on the airline, the season, and holidays. 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 €767.

According to our data, the cheapest time of day to fly to San Francisco is in the morning. momondo users have found flights departing from Ireland to San Francisco in the morning for as low as €661. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are €664 on average. Flights to San Francisco from Ireland at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Dublin to San Francisco for the best Ireland - San Francisco flight prices

You are more likely to see cheaper flights to San Francisco from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around €624 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Ireland for as low as €521 on momondo.

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

Aer Lingus, TAP AIR PORTUGAL, and WestJet are the most popular carriers operating from Ireland to San Francisco

Aer Lingus, United Airlines and American Airlines are the top three most popular airlines that fly to San Francisco from Ireland according to our data. Aer Lingus is the first choice among our users, with 77% of people opting to fly with this airline when travelling to San Francisco. Keep in mind that there are 7 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

Historically, on average around 12% of flights between Ireland and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 134 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.

As of June 2026, 4 flights take off from Ireland and land in San Francisco each day. The most common flight departure time for this route is 13:00, with 100% of daily flights taking off in the afternoon.

The number of flights available between Ireland and San Francisco is 28 per week as of June 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.