Inquiry Submission By RMVPTravel

Hello. I am doing test airfares for a trip with these specifications:

Flight out – Melbourne Australia, to Ho Chi Minh City (Saigon), on Saturday, 14 December 2019

Return – Siem Reap, Cambodia, to Melbourne, Sunday 12 January 2020.

I have done test airfares with these dates with several airlines. The best ones for price and timing seem to be Singapore Airlines, and Vietnam Airlines.

With the tests done 19 February 2019, there is a Singapore Airlines fare for AUD$2560 for two passengers, economy.

However I was surprised when Vietnam Airlines was more expensive for the same dates. Vietnam Airlines came out at $3824.00

I thought that seemed very high so I tried Vietnam Airlines with October 2019 dates. That came out cheaper: AUD$2044.00

Is the price discrepancy because October is that much cheaper than December? Or is it just too early to be checking December flights this way, and the flights for December will get cheaper?