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Discovered today is a $971 round/trip airfare from Dallas-Ft Worth to Tokyo on Delta Airlines.
The good news about this airfare is that it only requires a 3 day advance purchase. Want to do a spur of the moment trip to Japan? Buy this airfare!
It is also valid for travel until the end of the year, and into early NEXT YEAR, on pretty much any day except for a few dates over the summer. Want to experience a Japan Christmas or New Year? Buy this airfare!
I am not sure how long this fare will be around. A change of planes will be required, but you do have the option to arrive/depart from Tokyo on an afternoon Narita flight or a late night Haneda flight.
If you are from around Dallas and want to experience Japan, book this trip while it lasts! Otherwise you are then looking at around $1,800-$2,000 round/trip for nonstop flights.