According to the map of Gaode, it is 36 kilometers from Erqi Square to Xinzheng Airport, and it takes 1 hour and 29 minutes by subway. The specific bus routes are as follows:

1. Depart from Erqi Square and walk 183m to Erqi Square Station.

2. When entering the station, take Metro Line 3 (in the direction of Yinggang) and take 2 stops to Dongdajie Station.

3. After getting off, walk 338 meters in the station, transfer to Metro Line 2 (in the direction of South Fourth Ring Road), and take 7 stops to reach South Fourth Ring Road Station.

4. Transfer to suburban line at this station (in the direction of Zhengzhou Airport Station) and take 12 station to reach Xinzheng Airport Railway Station.

5. After getting off the bus, walk 459 meters inside and outside the station to reach Xinzheng Airport Terminal.