Cheap flights from San Francisco to Ireland from $319

In general, February is the cheapest month to fly from San Francisco to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $651. If you aren’t able to travel to Ireland during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $682.

The cheapest day to depart on your flight to Ireland is on a Sunday when prices can be found for as low as $914. This is often the case because there is less demand to fly during this day of the week. Flights from San Francisco to Ireland on a Thursday will generally be more expensive and average around $1,083. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Ireland is in the evening. momondo users have found flights departing from San Francisco to Ireland in the evening for as low as $680. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Ireland is in the afternoon when prices are around $977.

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

You are more likely to see cheaper flights to Ireland from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $922 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from San Francisco for as low as $828 on momondo.

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

JetBlue, Delta, and Aer Lingus are the most popular carriers operating from San Francisco to Ireland

Aer Lingus, American Airlines and United Airlines are the top three most popular airlines that fly to Ireland from San Francisco according to our data. Aer Lingus is the first choice among our users, with 80% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 14 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between San Francisco and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 147 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

As of September 2026, there are 4 flights per day flying from San Francisco to Ireland. The most common time of day flights depart is 5:00PM, with 100% of flights taking off in the afternoon.

As of September 2026, 28 flights take off from San Francisco and land in Ireland each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.