wǒ yào zhíjī
I need to check in for a flight
我想托运行李。
I want to check my luggage
The phrase is 我想 (I want to) + 托运 (to check in, for luggage) + 行李 (luggage). 托运 specifically means to consign or check in baggage, so it's the correct verb for airport luggage check-in.
Use this at the airport when you need to check your bags. It's clear and appropriate for any airline counter. You can also say 我要托运行李 (wǒ yào tuōyùn xíngli) which is more direct, but 想 is more polite. If you have a specific bag, you can point and say 我想托运这个 (wǒ xiǎng tuōyùn zhège) meaning "I want to check this one."
“I want to check my luggage” in Chinese is 我想托运行李。 (wǒ xiǎng tuōyùn xíngli).
我想托运行李。 is pronounced wǒ xiǎng tuōyùn xíngli.
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