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Just checked for you using Southwest and it is $680.
But you can buy Southwest Giftcards for 10% off (sometimes even lower during sales) on Costco.com.
I just saw Costco is selling a $500 Southwest gift card for $429.
That gets you to $610.
Book your tickets and then wait for a Southwest sale (since you can rebook at the lower price for free).
You can do it online, and it will tell you if the prices has dropped.
You can cancel flights for full credit till 10 min before the plane departs.