The way to take the subway is as follows:

1. Walk about 770 meters from Beijing International Hotel to Wangfujing subway station.

2. Take the subway 1 line at Wangfujing Station (Sihui direction) and get off at Jianguomen Station.

3. Transfer to Metro Line 2 (in the direction of Capital Airport) and get off at T2 Terminal.

4. Walk about 900 meters from the subway station to the Capital Airport 1 Terminal.

The whole journey is about 1 hour, and the cost is around 7 yuan (excluding the cost of purchasing subway tickets).

The bus routes are as follows:

1. Walk about 570 meters from Beijing International Hotel to Wangfujing Station.

2. Take Airport Bus Line 2 or Airport Bus Night Line and get off at Capital Airport 1 Terminal.

The journey takes about 50 minutes, and the cost is around 25 yuan (excluding bus fare).

If you choose to take a taxi, it takes about 40 minutes from Beijing International Hotel to Capital Airport 1 Terminal, and the cost is about 100 yuan (excluding low-speed driving fees and tolls).

To sum up, taking the subway may be the most time-saving and money-saving choice, but in the end, it will take some distance to reach the destination; It is relatively cheap to take the bus, but you need to know bus timetable in advance; Taking a taxi is more convenient and faster, but the cost is higher.