Some of my most 'interesting' ones that others might not have flown on.
Denpasar Bali (DPS) - Sumbawa Besar (SWQ)
[Wanted to fly on the Fokker 50
]
Sumbawa Besar (SWQ) - Lombok Praya (LOP)
[Well, had to get back to Bali from Sumbawa
]
Don Mueang (DMK) - Ubon Ratchathani (UBP)
[9 daily flights (on DD and FD) from DMK, but can't really imagine many visitors to Ubon]
Ubon Ratchathani (UBP) - Chiang Mai (CNX)
[it WAS a scheduled 'private jet' flight when i flew it]
Jakarta (CGK) - Pangkalanbun (PKN) v.v
[if you like orang utans or have visited Kalimantan you probably would have flown on this route though]
Probably someone would have done this though, should be less uncommon.
Singapore (SIN) - Cairns (CNS) v.v on the direct.
[flew it on SQ in 1999 a few months/years before the route was discontinued. Australian Airlines flew it too but it too stopped. The Jetstar flight a few years back was via Darwin though. Silkair is resuming links between the 2 cities next year though]
Originally Posted by
Markam
I think that in these "globalized" times it is difficult to find something that no one else has never done, but these are which I think have probably been my most exotic flights so far:
SUB-CGK on Lion Air (JT)
If anyone has also been on some those flights with those airlines and has good memories, you are very welcome to share!

Done this (Batik Air), but i would think that this is a very popular route.
Originally Posted by
Lockz
Here are some from a Southeast Asia trip in 2012:
Singapore-Penang (SIN-PEN)
Done this too(boring Jetstar Asia), but likewise many have flown on this
Originally Posted by
sbm12
SIN-SZB isn't all that common, but it is one of the less frequent operated flights I've taken.
Originally Posted by
BuildingMyBento
Was SIN-SZB with Firefly? I used SZB just to "check it off," but the lack of public transit means I'll never volunteer to use it again.
Originally Posted by
LuisHK
SIN-SZB route is only by Firefly now. To get around the airport, taxi probably is the only good solution... even though the cab drivers there are known to be bad.
Thankfully my friend lived near the airport so I was able to get a free ride out when I did this route

Looks to be a good choice given the comments, didn't know it was so bad haha.