Getting off Aer Lingus, and have to check in for MAS at Heathrow

Upvote:2

Your AerLingus check in agent may be able and willing to check your bags through, notwithstanding that they have been written as separate tickets. Have your MAS confirmation with you. You can probably check in online for MAS even before you go to the airport in Dublin.

Otherwise, yes, you will have to do all those steps. I don't connect through London often, but 2.5 hours would be my first guess, since you will at least not need passport control in London.

Upvote:3

You will arrive at Terminal 2 at Heathrow. You will need to go over to Terminal 4 for your onward flight.

There is no passport or identity control on arrivals from Dublin (usually) but there is potentially a customs inspection. In reality it is unlikely you will be stopped by customs officers. After you collect your bag and exit, you will need to walk over to Heathrow Central, to catch a shuttle train over to Terminal 4. The shuttle is free. This takes about 15-20 minutes. Then you need to check in with Malaysian Airlines, drop your bag and clear security again.

If you are fast and everything works, 2 hours would be sufficient for this on most days. But you have no protection if anything goes wrong. You are responsible if your Aer Lingus delays your flight or takes time in delivering your bags. If you miss your Malaysian Airlines flight your ticket will be cancelled (including the return part), and you will probably have to buy a new ticket.

Therefore I strongly advise something more like 5 or 6 hours, or perhaps even an overnight stay.

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