It’s probably a wash. A one way FRA-SIN in April will run you about $550 on something nice like Qatar, Etihad, etc. You may be able to get down to $450 with double connections.
Round trip with a random return date in Oct would be around $700. I’m not sure about the exact change rules, but if it were United, it’ll cost you around $250 to change the date. If you want o go this route you’d have to study the fine print for every option. If the change fee is less $300, your probably better off doing the round trip.
Main advantage on the round trip @700: it included the non-stop from on Lufthansa which saves you a connection. If your departure point is not FRA, that wouldn’t count.
There are Open Tickets for that but are generally quite expensive for the flexibility. It is easiest to buy the cheapest return-ticket which has a change fee, usually $50-$100, plus potential fare difference. A one way ticket is also possible but often countries now require passengers to have return tickets to be admitted through immigration. Not sure if this is the case for you since it depends on your nationality and Singapore ruls.
Buying two one-way tickets is also possible but often cost more than a single return ticket. In certain cases it costs the same but that depends on airline pricing. In my experience, getting two one way tickets has most often cost more than a return ticket.
When I have been in a similar-ish situation I chose to pick the most likely date for return and a semi-flexible return ticket (one that said “non-refundable” etc but with a modest change fee anyway). Very much cheaper than two singles and the change fee would only have been about £100 (though I guessed right so did not need to pay it).
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4 Mar, 2024
5 Mar, 2024