In the US you always clear immigration at your first point of entry. So if not for the pre-clearance, you would have cleared in Atlanta. Since you will clear in Dublin, your bags will be checked through to Las Vegas and you won't have any arrival formalities in Atlanta. On arrival in Las Vegas you just go to bag claim and head out the door.
Airlines recommend a 3 hour arrival time prior to the Dublin departure to make sure you have plenty of time. Don't cut it too close.
3 hours before our flight in Dublin to do the immigration process??? Should save a lot of time in America anyway especially Vegas its the last place on earth you want to be stuck in an immigration line
Have to mention that later flights do not have pre-clearance. Ours is a 3:45 pm flight home and we'll go through customs in the US. Have fun in Vegas!
"3 hours before our flight in Dublin to do the immigration process??? Should save a lot of time in America anyway especially Vegas its the last place on earth you want to be stuck in an immigration line"
Well, you wouldn't be clearing immigration in Las Vegas anyway...but yes, 3 hours is recommended at Dublin. Not just for immigration, but for the whole check-in process and security.
As IrishFan said you will clear immigration in Dublin. In Atlanta you will arrive in the International Terminal and will transfer to Domestic Terminal for you connecting flight to Las Vegas. Any checked bags will be checked all the way from Dublin to Las Vegas.
US pre-clearance is great but only available on morning flights. You will definitely need the full 3 hours before your flight departs as 5am-8.30am is seriously busy in Dublin Airport .. which I learnt the hard way! FYI There is a 2nd scan/search at the US customs area but your water bottle etc will be fine in that one. It is only the first main airport security check that they are watching for the the liquids. There can be a queue down here too so don't leave it too long before heading for your gate.
I went through last week for a 3:30 flight to New York. I was there 3 hours before and it was plenty of time. Pre-clearence was not much of a time consumer even with carry-on baggage getting scanned twice. We spent more time shopping in duty free then the clearence
I would expect the 3:30 flight would not take as long. There is a big "crunch time" in the mid-to-late-morning when the OP will be flying out. The Delta Atlanta flight, the Delta JFK flight, the United Washington DC flight and a couple of Aer Lingus flights all leaving within a couple hours of each other.
American Airlines to Chicago, 10 a.m. We'll be sure to get there by 7 a.m.
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