Citing industry sources who asked not to be identified, the P-I, a KOMO News partner, said the deal would be announced next month at the Paris Air Show.
The average list price for the new extended-range model of the widebody twinjet is $191 million, but airlines typically get discounts as big as 30 percent or more because of the current soft market.
Emirates' expansion plans also include purchases from Boeing's European rival, Airbus, to be announced in Paris, Flight International's latest edition reported.
According to the magazine, Emirates will order 23 more superjumbo A380s, bringing to 45 the total number of firm orders the Dubai-based carrier has placed for the 555-passenger jet, plus 10 A340-600s with options on another 10 A340-600s.
The 777-300ER, now in flight tests and scheduled to enter service next year, was designed to compete with the A340-600, which is already in service.
With a longer wing to hold more fuel, the 777-300ER can carry 365 passengers as far as 7,250 nautical miles, about 1,200 nautical miles more than the 777-300. So far Boeing has reported 56 firm orders for the new model from seven airlines and leasing companies.
At the Dubai Air Show in November 2001, Emirates announced it would buy 25 Boeing 777s, but that never materialized into a firm order and was for existing versions of the 777.
Emirates subsequently began negotiating for a switch to the extended-range model, the P-I reported.
According to the newspaper, the final issue was resolved when Emirates agreed to accept for the General Electric engines that are now used on the new plane, rather than seeking more powerful engines.
The GE90-115B is certified at 115,000 pounds of thrust, compared with 90,000 to 100,000 pounds by the GE, Rolls-Royce and Pratt & Whitney engines on other 777-300s and -200s.
Hot weather, common in much of the Middle East, can cut engine performance.
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