August is the cheapest month to fly this route, with average fares around $643 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $657 | $631 | ||
| June 2026 | $744 | $701 | Peak | |
| July 2026 | $669 | $607 | ||
| August 2026 | $643 | $643 | Best |
Departing on Sunday offers the lowest average fares at $687. Thursday departures are the most expensive at $705, a difference of $18.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Boston to Dublin is August, with average round-trip fares around $643.
Sunday departures are the cheapest, averaging $687 round trip. The most expensive day is Thursday at $705.
Based on current pricing trends, booking for August travel offers the best value. Avoid June if possible, as fares average $744 compared to $643 in the cheapest month. July is a solid middle-ground option at $669.
Flying in August instead of June can save you approximately $101 per round trip. The cheapest month averages $643 while the most expensive averages $744.
Airlines, flight times, price calendar, and more for Boston to Dublin
View BOS → DUB Details