The total means that so far this year, Dublin Airport has welcomed more than 25.3 million passengers, which is a 6% increase over the same period in 2016.
The number of passengers flying to and from continental Europe increased by 5%, as more than 1.3 million passengers travelled to and from continental European destinations in October.
Almost 841,000 passengers travelled to and from UK destinations last month, a 2% decrease when compared to October last year.
Transatlantic traffic to North America increased by 14%, with more than 333,000 passengers travelling on this route sector last month.
The number of passengers travelling to other international destinations in the Middle East and North Africa increased by 16%, with over 69,000 passengers flying to these routes in October.
Almost 8,000 passengers travelled on domestic routes last month, which was a 6% increase over the same month last year.
So far this year, the number of passengers using Dublin Airport as a hub to connect to other destinations has increased by 36%, with more than 1.3 million passengers connecting at the airport between January and October.
More than 1.4 million extra passengers have travelled through the airport between January and October.