My husband and I (US citizens) will be flying Dublin - YUL - Chicago ORD next month. Can we use the preclearance in Dublin for customs? The last time we went through Montreal the customs area was so backed up and slow, we missed our flight into Chicago. We do NOT want that to happen again this time.
As far as I can tell, from experience at DUB and their website, this service is only available for flights going from DUB to US airports. You will have to clear US customs at YUL unfortunately.
If you are travelling from Dublin to the US on your connecting flight you can use the Preclearance facility in Dublin and will not have to go through US customs when you land.
If you fly from Dublin to another airport outside of the US before travelling on to the US and if that airport that does not offer Preclearance you will have to go through customs in the US.