Prince William and Catherine, Duchess of Cambridge.

Casual style: Prince William, pictured here with Kate, is not one for unnecessary formality. Photo: Reuters

He's no pauper, but he certainly doesn't behave like your average prince.

Prince William has mucked in with the masses and flown cattle class from Memphis to Dallas. He was there with Prince Harry attending the wedding of old friend, Guy Pelly.

Following the festivities, William was beginning his journey back home to Kate and George when he was spotted by local news reporter, Eli Ross.

Ross snapped a picture of the top of William's head and tweeted '#Exclusive pic: I am still amazed #Prince William flies COACH. That's pretty humble/awesome. Who knew?'

The tweet drew a flurry or responses from British newspapers desperate to know details and regular Twitter punters with comments.

''He's as down-to-earth and connected to people like his mom [sic] vs other royals,'' wrote one.

''He'd be criticized [sic] by the British public for wasting tax payers money if you [sic] didn't make such gestures – we pay his bills," wrote another. 

The princes were accompanied by taxpayer-funded security guards from Scotland Yard’s Royalty Protection Squad. However, they are believed to have paid for their own flights and this is not the first time one of them has flown economy.

In 2011 Prince William and Catherine flew economy from Edinburgh to Manchester while a hungover Prince Harry chose EasyJet to wing his way to London.

While on tour in Australia last month William and Kate flew on both commercial and private military aircraft.

Fairfax Media