SecretFlying points to a roundtrip fare on Qatar Airways between Atlanta and Tehran for as little as $536.
The base fare on this itinerary is just $35.50 each way, the rest is all fuel surcharges and taxes. Interestingly, a roundtrip is at least $100 cheaper than a one-way to Iran. And it’s about half the price of a one-way to Doha. So there are interesting ‘throwaway’ opportunities here for someone wanting to travel just to the Mideast.