Airlines traveling to Ahmedabad both require one stop at either Mumbia or Delhi

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• Jet Airways
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• Air India
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Flight Times  Heathrow -  Mumbia  8 Hrs 50Mins
Mumbia    -  Ahmedabad 1 Hr 20 Mins

Flight Times  Heathrow -  Delhi  8 Hrs 20Mins 
Delhi         - Ahmedabad  1 Hr 20 Mins