Flying Las Vegas → Dublin at the front of the plane
The journey from Las Vegas to Dublin is exactly the kind of flight First Class was designed for: long enough to sleep properly, dine unhurried, and land at Dublin Airport (DUB) ready for the day.
Because no carrier flies true First Class nonstop on this pairing, the routing craft matters. British Airways, Air France, Lufthansa and United Airlines each offer superb one-stop itineraries through their hubs — often at fares below what a nonstop business seat would cost, with a lounge stop that feels like part of the vacation.
Harry Reid International offers comfortable premium and club lounges, including strong contract facilities used by the international carriers, but no flagship First Class lounge. The elevated ground experience begins at your gateway — the Qantas First Lounge at LAX or the Emirates lounges on the coasts — which is another argument for the positioning strategy.
On timing: may through September is Dublin's bright season — eighteen-hour June days, festival calendars, and the coast at its best — with airfares peaking to match. St. Patrick's week in March and the autumn rugby internationals spike hotels dramatically. October and November are atmospheric and well priced, and the weeks after New Year offer the softest premium fares of the year. Pack for rain in every month; that part never changes.