The cheapest airport is not always where you're going.

On 27 August, Sky Spy compared cached fares from Melbourne, Sydney, Brisbane, Perth and Adelaide to 22 European airports for travel on 10 and 11 November 2026. For each route we kept the lowest observed one way economy fare, then calculated the median across the five Australian origins.

That produced 110 route comparisons. It is broad enough to expose a useful pattern, but it is not a promise about next Tuesday, Christmas or the European summer. Airfares are perishable. The winner changes with the departure city, date, baggage, itinerary length and whatever an airline is trying to fill that week.

Treat the figures below as a shortlist generator. Search live fares for your dates before making a decision.

Heathrow had the lowest median in this particular sample: A$668 across the five Australian origins. Rome followed at A$675. Vienna's median was slightly higher, but it produced the cheapest single observation at A$573 from Perth and remained competitive from every city we checked.

The first seven gateways were separated by only A$47 on median price. That is the real lesson. There was no magical airport that made every route cheap. There was a compact group worth comparing, followed by a decision about where the holiday actually begins.

From Melbourne, Heathrow led at A$636. Sydney's lowest result was Madrid at A$623, with Rome only A$7 behind. Perth's A$573 Vienna fare was the outlier of the entire exercise. Brisbane started much higher, at A$860 to Heathrow, while Adelaide's best was A$852 to Vienna.

This is why a national “cheapest airport” claim should make you suspicious. Perth's geography and airline mix are not Melbourne's. Adelaide often needs an extra connection. A route that looks brilliant from Sydney can be thoroughly ordinary from Brisbane.

If you can cheaply position to another Australian city, compare that too. Price the domestic sector with baggage, an overnight buffer and the risk of a missed connection. Saving A$140 before paying A$110 for a domestic flight is not a breakthrough.

For each plausible airport, add six things:

1. 1The airfare including the baggage and payment fees you will actually incur.
2. 2Transport from the airport to the first hotel, or to the next city.
3. 3A hotel night created by a late arrival, early departure or sensible buffer between separate tickets.
4. 4Another flight or reserved train, priced for the date rather than guessed from a headline fare.
5. 5The value of the usable holiday time lost to the detour.
6. 6The risk cost of separate tickets: a bigger buffer, flexible fare or travel insurance excess.

Then ask a less mathematical question: would you willingly spend a night in that gateway? If yes, the transfer can become part of the trip. If no, charge it honestly as friction.