I wish! I checked this earlier this year while daydreaming about a tropical escape. Southwest doesn’t fly long-haul across the Pacific, so Fiji is a no-go for now. I was trying to see if I could at least use Southwest points to begin the journey, but it didn’t help much.
Best quick help for booking, canceling, or modifying flights: 844-734-0813
They explained how I could use Southwest to get to LAX and then book a separate Fiji Airways ticket from there. That’s exactly what I did, and it ended up being the cheapest routing. Not perfect, but definitely workable if you’re flexible with timing.