Tickets for new non-stop Perth-London Qantas flights go on sale on Thursday morning, with flights to begin March 24, 2018.
The national carrier announced in December it would operate non-stop flights from Perth to London using the 787-9 Dreamliner from March 2018 - the first regular, non-stop flight between Australia and Europe.
The route of almost 14,500 kilometres will take 17 hours and will be the third-longest passenger flight in the world and the longest Qantas flight.
It is expected to cost from $2270 return, according to Australian Business Traveller.
???Depending on the fare type, people travelling both to and from Australia can stop over in Perth for no extra charge.
Tourism WA has said it could inject $9 million-$36 million a year into the WA economy, depending on passenger load.
The organisation, alongside Qantas, have committed an extra $5.7 million over three years between them to market WA as a stopover destination across the UK, Europe and Australia.
"The market here is under some pressure," Tourism WA chief executive Gwyn Dolphin told Radio 6PR on Thursday.
"We have a lot of new hotel rooms in the market.
"This is a critical step. The UK has always been a significant market, more than anywhere else in Australia.
"Ex-pats bring friends and family to visit and encourage them to explore the service.
"It may not appeal to everyone but it will be very appealing for a lot of people.
"This will add the variety to passengers, they have a greater choice of what they would like to do."
He said the campaign would be delivered over the next year through both Tourism WA's #justanotherdayinwa campaign and Qantas' own campaigns.
"Part of the advertising and marketing campaign is to make people aware of what we have in WA, whether it's in the city itself, Rottnest, Swan Valley, or further if you stay longer. We have a lot for you to do, creating more awareness to potential visitors of what Perth has to offer," he said.
Ellis Taylor from aviation news website Flightglobal predicted last year Qantas would have to charge $2000 for fares to cover the costs of carrying more fuel compared to the more usual $1200 to $1500 deal for a flight with stopovers.
The state government committed $14million to upgrade domestic terminal T3 with border services to match the extra investment from the federal government for extra border security employees.
T3 will also process the airline's current international services from Perth to Singapore and Auckland until Qantas relocates to the international terminal T1 by 2025.
The deal is expected to create new jobs at the airport, for Perth-based pilots and in businesses providing support services, and potentially allow West Australian produce to be used on the long haul flights.
