To come-back from the airport, depending on your terminal just follow the signs for shuttle buses, then go to the counter and buy a ticket for Tianjin 我想买一张去天津的票 （wǒ xiǎng mǎi yī zhāng qù tiān jīn de piào）
2- Go by subway + train + subway + express railway or taxi + train + taxi (or any combination that you may like)
-We don’t really suggest you to do that because it can be very stressful to go with your luggage to Beijing then take the subway then the express railway. But if you want to do so please keep in mind:
-Tianjin to Beijing-South train ride takes around 35 minutes, but you need to add the time to buy a ticket, enter and exit the stations (1 hour or more): price 54.5元
-Beijing South Railway Station to Beijing international airport is a minimum 50 minutes ride (37 kilometers) with toll. And you need to add the time of waiting for a taxi and traffic jam; price around: 150元, but can be up to 200元 under bad traffic conditions
-From Beijing South Railway Station to Beijing international airport using subway + express train is a 1 hours 10 minutes ride (line 4 change to line 2 change to express railway) cost around 40元
-There is a shuttle bus from Beijing south railway station to the airport (1 hours 10 minutes): 30元
3-Book a private driver to/from the airport
-Best solution for groups and if you have a lot of luggage.
-You can make your booking in advance, before taking your flight, so your private driver will be waiting for you. (very convenient in the middle of the night)
-You can find driver and car with the Chinese app: 易到 copy/paste the name into your app store
-You may find a car on Didi, read: Click here: Didi application now in English in Tianjin, but 易到 is definitely better for this kind of trip.
You will need some Chinese skills
Cost: start at 422元, non-including toll fees.
4-Take a cab in Tianjin
Be ready to pay a lot of money and argue a lot