Economy FlexThe most flexible: unlimited changes, cancellation option, selection of seats and baggage in the hold.
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A Flex Plus fare is a totally flexible and unrestricted fare. You earn the maximum number of Skywards Miles with this fare type.You can refund or change the date of a Flex Plus flight reward with no charge.
Economy Semi-Flex tickets are partially refundable. The Economy Flex fare option offers maximum flexibility. These fares allow unlimited free flight changes and are fully refundable.
Economy Flex: refundableUnused ticket is refundable, partly used ticket is recalculated for the flown portion and the residual value will be refunded. Please note that service fee and no-show fee may apply.
With standard Premium Economy, the fare is non-refundable but credit-eligible, and changes are subject to a fee and difference in fare. With Premium Economy Flex, you'll enjoy full refundability and only pay a fare difference if you make any changes.
If basic economy is all about savings, then flex fares are all about comfort and getting bang for your buck. You can forget the dreaded middle seat with seat selection included in your fare. Changes usually have a reduced fee, and standby is usually free.
To my best knowledge the Saver fare can only be upgraded with miles. So you need to have a Flex or Flex Plus ticket. You can upgrade with miles but sometimes only 24 hours before your flight departs. With money you can upgrade more or less immediately.
Another perk of Flex fare is that customers can enjoy Priority Check in, Priority Boarding and Priority Baggage. For Flights between Kuala Lumpur and Singapore the Economy Flex product is known as MH Shuttle.
Economy plus is a slightly upgraded economy experience, while premium economy is its own cabin with elevated service on international flights. As airlines love to throw different names on their seats, be sure to check which class you're actually getting before booking.