Cheap flights from Chicago to Perth (ORD to PER) from $2,622

Book at the right time: For international flights, aim to book 6–10 weeks ahead. Last-minute fares on Chicago to Perth are rarely cheap, and prices spike sharply within 2 weeks of departure.

Shift your dates by a day or two: Mid-week departures (Tuesday–Wednesday) are almost always cheaper than weekend flights. Even shifting by one day can make a meaningful difference.

Factor in baggage fees: Low-cost carriers on this route often advertise attractive base fares but charge separately for checked luggage. Always compare the all-in price — a $20 cheaper fare plus $50 baggage fee is no saving. SWISS and Delta Air Lines may have different inclusions, so check each airline's fare conditions.

Search in private browsing: Some booking sites use cookies to track repeat searches and may show higher prices after multiple lookups. Use an incognito or private window — or just use Booked AI, which pulls live prices without any tracking markup.

Compare two one-ways against a return: On some international routes, booking a one-way with one airline and the return with another can undercut a standard return ticket — especially if a budget carrier covers one direction. Check both options with the flexible dates calendar above.

The cheapest flights from Chicago to Perth start from $2,622, with typical prices ranging from $2,622 to $2,922.

Airlines operating this route include SWISS, Delta Air Lines, China Southern Airlines, Qantas, Air Canada, Cathay Pacific, Qatar Airways, Lufthansa, British Airways, Air New Zealand, Singapore Airlines, American Airlines, Finnair, Alaska Airlines, ANA, Etihad Airways.