Visa Question – re-entry

Hi all!
Just looking for a bit of advice in relation to re-entering Thailand in order to travel home from the airport.
Im travelling to Thailand on the 14th of June and staying until the 10th of July from where I’ll be taking a flight to travel in Cambodia for a week.
I was planning on getting the 30 day visa on arrival in Bangkok as I’ll be leaving Thailand within 30 days.
My worry is that I will be flying back home on the 18th of July.
I will be travelling from Cambodia back into Bangkok (most likely by bus) where I’ll be flying back to Europe.
Just wondering if I’ll be able to apply for another 30 day visa at that stage when im re-entering Thailand again from Cambodia (by bus) and whether the fact that I had previously just been in the country on the 30 day visa will affect my re-entry.
Im not planning on spending any more time in Thailand. Just will go straight to the airport in Bangkok from Siem Reap.
Would appreciate any advice on this!
Thanks again 😊

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