Flight Deals from Chicago O Hare Airport to Phoenix from $74

Flying from Chicago to Phoenix is most expensive in late winter to early spring, with low fares in January and September.

When planning your flights from Chicago to Phoenix, consider that ticket prices tend to soar during the late winter into early spring, peaking around mid-December and late March, where prices typically reach their highest range, often above $300. Conversely, you’ll find the most affordable fares during January and September, where prices can dip below $220. These fluctuations indicate clear high and low seasons: expect high prices during the winter holidays and spring break, while fall and early winter months offer significant savings opportunities. Notably, the shifts from low to high prices can be abrupt around early December and late March.

Book flights from Chicago to Phoenix 28-54 days in advance to secure the lowest prices and avoid high last-minute rates.

For your trip from Chicago to Phoenix, it's best to book your flight 28 to 54 days before departure. Prices are lowest about 34 days ahead, around $245, but can spike to $372 if booked earlier. Although similar prices are available from 54 to 28 days, you should avoid waiting too long, as prices start climbing rapidly within 21 days of departure, reaching up to $524. Therefore, it's crucial to book early to avoid paying significantly more.