Surinder Arora, a hotel tycoon, has put his proposal to the government's public consultation on Heathrow.
Ministers have expressed a preference for the airport's plans for a new runway and terminal costing 17.5 billion pounds, BBC reported.
Heathrow said it was already considering some of the ideas, and wanted to lower the cost too, the report said.
Arora Group's proposals include changing the design of terminal buildings and taxiways, and reducing the amount of land it is built on, it said.
"One of the options we have proposed to the government includes a possible shift of the runway so that it does not impact on the M25 and M4, as we know the M25 junction being affected threatens the deliverability of the whole project.
"We appreciate this is a politically sensitive issue but it is merely an option with additional savings of 1.5 billion pounds, whereas the rest of our proposals save up to 5.2 billion pounds (USD 6.44 billion) without the need to amend the runway location," Arora said.
British Airways is Heathrow's biggest customer.
An airport spokeswoman said: "Heathrow's expansion proposals are supported by the government and have widespread cross-party political, business and union support".
"We continue to develop our plans to improve passenger experience, reduce the impact on local communities and lower the cost so we deliver expansion at close to current charges.
"Some of the options we are looking at sound similar to those suggested in this submission, and we will welcome views on these in the public consultation later this year," the spokeswoman said.
A Department for Transport spokesperson said: "The government has made it clear that it believes a new north-west runway at Heathrow is the best scheme to deliver the economic and connectivity benefits this country needs.
"New capacity will increase competition between airlines resulting in lower fares for passengers," the spokesperson said.
The Department for Transport has estimated a new runway at Heathrow would bring economic benefits to passengers and the wider economy worth up to 61 billion pounds, and create as many as 77,000 additional local jobs over the next 14 years.
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