We normally don't have direct flights to Figi. Inorder to reach Suva, you need to travel via Singapore or Australia. As it's multi hop, it adds up to the air fare. You can keep a tab on one of the hopping point for cheaper air fares to Figi. Unless it is must travel, you can plan other locations that fits with your budget.
If you travel cheapest as a couple to Fiji. It is generally no direct flight to Fiji, you have to travel through Singapore or Australia. Travel in a shuttle from Cancun to Tulum and enjoy your short business trip through Oscar Cancun Shuttle. You might travel alone on a flight and make your way to the destination on time.