How can I claim my all 1200 dollar for travel

The maximum deduction you can claim for each eligible trip is the lowest of the following three amounts:
• either the taxable travel benefits you received from employment for the trip or the portion of the $1,200 standard amount for the person travelling (you or your
eligible family member) that you allocate to the trip

• the total travel expenses paid for the trip 

• the cost of the lowest return airfare available at the time of the trip between the airport closest to your residence and the nearest designated city to that airport

If you or an eligible family member uses the standard amount to calculate a travel deduction in the year, $1,200 is the maximum total amount that may be claimed for each individual who travels, for all trips taken in the year by that individual.