The Air Force has made no comment regarding the flyover in the skies above the Beehive State, so it is unknown where the B-2 Spirits took off from or where they headed.
Some users on social media suggested the B-2s may have been taking part in an exercise at Nellis Air Force Base (AFB) near Las Vegas and flew out to Utah and were then on their way back home. A few users poked fun as well on social media with one user suggesting, “Just zipping over to bomb the crap out of Nevada, then home for coffee and snacks.”
While the Air Force has just twenty of the aircraft in service, since its introduction in 1997, the Northrop Grumman B-2 has often been the first to fight. Designed to penetrate anti-aircraft defenses, the B-2 can deploy both conventional and thermonuclear weapons.
The B-2 is also the only acknowledged aircraft that can carry large air-to-surface standoff weapons in a stealth configuration. The bombers can carry up to sixteen B-61 or megaton-yield B-83 nuclear gravity bombs on the rotary launchers inside its two bomb bays. The aircraft’s avionics are also hardened versus the electromagnetic pulses generated by nuclear blasts. The Air Force plans to operate its B-2 fleet until 2032 at least, when the Northrop Grumman B-21 Raider enters service.
https://www.19fortyfive.com/2021/03/why-were-three-rare-b-2-bombers-flying-over-utah/
B-2s come from Whiteman AFB, make that trip non-stop if wanted.