August is the cheapest month to fly this route, with average fares around $224 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $266 | $230 | Peak | |
| June 2026 | $237 | $210 | ||
| July 2026 | $231 | $210 | ||
| August 2026 | $224 | $210 | Best |
Departing on Tuesday offers the lowest average fares at $216. Saturday departures are the most expensive at $249, a difference of $33.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Phoenix to Chicago is August, with average round-trip fares around $224. The lowest fare found in August is $210.
Tuesday departures are the cheapest, averaging $216 round trip. The most expensive day is Saturday at $249.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $266 compared to $224 in the cheapest month. June is a solid middle-ground option at $237.
Flying in August instead of May can save you approximately $42 per round trip. The cheapest month averages $224 while the most expensive averages $266.
Airlines, flight times, price calendar, and more for Phoenix to Chicago
View PHX → ORD Details