With immigration, probably not since you can show them the return ticket within visa validity.
With airline, however, they will check if you have a valid visa for the period of your ticket. Since your visa is only 30 days they may not accept you for the flight. If you show them another one-way ticket, that shows your intention to throw away part of the ticket. Whether that is allowed or not depends on the airline.
Could I have problems with airlines?
Some airlines have policies against it, e.g. Delta
While not an exclusive list, the following ticketing practices are prohibited: […] Throw-away ticketing: use of discounted round-trip excursion fares for one-way travel.
But it is very unlikely to be enforced, unless perhaps if one does it very frequently.
FYI: Which flight search engines show cheapest flight options including throw-away ticketing?
One of the most common patterns is crossed bookings:
Depending on the fare rules this can often be a lot cheaper, because cheaper fares often have minimum stay requirements.
Yes, that’s totally fine. The practice is known as "nested ticketing" and is quite common.
Usually when using nested tickets you start with a one-way and add in return flights, but you’re doing it the other way around, which is also fine.
The one part airlines don’t like is throwing away your return ticket, but for a one-off, that’s not going to be an issue either. You might even want to double down: find a cheap return fare from Thailand and throw away the return leg — or use it come back to Thailand for another visit!
Credit:stackoverflow.com‘
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