Question: Is it possible to obtain a visa when your plans are fluid eg. I know roughly when I want to travel [month], know some places I wish to visit but want to stay flexible, I might book a tour for some of the time.
What is a companion in your passport?
Is it expected that you book flights without a visa? If not how can you give exact dates for entry and departure?
Answer: Your estimated itinerary is required since you should enter it in the visa application form. It is not expected to book your flights before getting your visa. You should only know your arrival and departure dates.
The companion in your passport is the number of people who share the passport with you, it is common in Iran.
For visa to Iran you have three ways:
1. Fill in the visa form on http://www.uppersia.com/Iran-Visa-Box/iran-visa-authorization-reference-number-invitation-application-form.html, it takes about 10-15 working days to get your reference number and two working days to collect your visa at the embassy by direct referral or one working week by posting the docs to the embassy. You can pay the visa fee in cash in Iran.
2. Fly to Iran and get a 14-day on arrival visa at the airport. This kind of visa is issued for 98 nationalities excluding USA, England, Canada, Colombia, Pakistan, Afghanistan, Iraq, Jordan, Bangladesh, and Somalia. If your nationality is among the countries authorized to get it, you can easily collect you visa against offering your passport, a passport-size photo and about $50 to the staff at the airport. There is no need to fill in any form beforehand.
3. Refer to the Iranian embassy in your country and ask for a visa to be issued for you. Usually this way takes longer time about 30 days.