As the war with Iran continues, oil prices are soaring and airlines will see higher fuel costs – which could hit travelers around the world in their wallets.

It will “probably start quick,” United Airlines CEO Scott Kirby told CNBC last week.

Crude oil prices surged after the US and Israel’s strikes on Iran and hovered around $100 a barrel on Thursday, closing above $100 for the first time in nearly four years, before closing the week slightly lower at $99 a barrel.