The Brief Chicago’s airports are expecting over 1.86 million travelers this Fourth of July weekend, an 11% jump from last year. Drivers heading to O’Hare should expect delays due to Kennedy Expressway construction and are encouraged to use public transit. O’Hare and Midway airports are bracing for a busy Fourth of July Weekend, with more than 1.86 million travelers expected to pass through their terminals — an 11% increase over last year. Officials expect the busiest travel day at O'Hare to be on Sunday when over 300,000 passengers are expected to go through the airport. While outbound express lanes are now open to O'Hare, travel time from downtown to the airport often takes over an hour.