Cheapest Time to Fly to Dublin (and the Most Expensive)

Dublin airfare swings a lot throughout the year—mostly because demand piles up during summer and holiday weeks. If you can travel in the quieter months (or even shift your dates by a few days), you can often save a solid chunk of money.

Quick Take

• Cheapest time to fly to Dublin: late January–March, late April, September, and November–early December
• Most expensive time to fly to Dublin: mid-March (St. Patrick’s Day), June–August, and late December–early January

Cheapest Time to Fly to Dublin

The cheapest flights to Dublin usually show up when fewer Americans are crossing the Atlantic—and airlines have more open seats to fill.

Late January to March (Post-holiday deal season)

This is one of the most reliable stretches for lower fares after the New Year rush fades. You’ll usually see more availability and better pricing odds than spring and summer.

Money-saving tip: Midweek flights: Tuesday–Thursday departures often price better than weekend-heavy dates.
Heads-up: St. Patrick’s Day: prices can jump in March around the holiday—especially for weekend travel.

Late April (Spring shoulder window)

Late April can be a sweet spot—spring is starting to feel good, but summer demand hasn’t fully kicked in.

Money-saving tip: Avoid weekend spikes: leaving on a Tuesday or Wednesday can make a noticeable difference.
Heads-up: Early May creep: prices can start rising as summer planning ramps up.

September (After summer travel drops)

Once peak summer travel fades, Dublin prices often soften again. September can be one of the best mixes of deal odds and comfortable trip timing.

Money-saving tip: Price-check 1–2 day shifts: moving your departure or return slightly can unlock cheaper options.
Heads-up: Late September: can trend higher than early September on some weeks.

November to Early December (Pre-holiday lull)

This is frequently one of the best value windows of the year—before late-December travel pushes prices up.

Money-saving tip: Return before the surge: coming home before mid-to-late December usually keeps costs down.
Heads-up: Thanksgiving week: can run higher than surrounding weeks for US travelers.

Most Expensive Time to Fly to Dublin

Dublin gets most expensive when big travel seasons overlap—summer demand, holiday travel, and event-heavy weeks.

Mid-March (St. Patrick’s Day)

This is a classic price spike window. Flights can climb fast, and the cheapest seats disappear early.

Peak within peak: The weekend closest to March 17 and the surrounding few days.

June to August (Summer peak)

Summer is usually the toughest season for deals—more families traveling, more packed flights, fewer low-fare seats.

Peak within peak: Late June through early August is often the highest price floor.

Late December to Early January (Holiday rush)

Christmas and New Year travel tends to price high—especially for departures right before Christmas and returns right after New Year’s.

Peak within peak: Late-December departures + early-January returns.

Decent Weather Without Peak Airfare Prices

If you want a nicer trip window without paying summer-level fares, these stretches are usually your best bet:

• Late April: spring feel, often cheaper than May and June
• September: post-summer pricing with great travel timing
• Early December: holiday vibe without late-December airfare

Best Window To Book Cheap Flights to Dublin

Transatlantic prices can move quickly—especially when the best nonstop options start filling up.

• Low/shoulder seasons: start tracking 2–5 months ahead
• Peak seasons (mid-March, summer, late December): start tracking 4–7+ months ahead

Extra tip: Compare nearby airports, because different departure airport can change the price a lot.

Seasonal Flight Demand Chart for Dublin

Use this chart as a quick guide to the cheapest vs. priciest months to fly.