FlyerTalk Forums - View Single Post - What's the earliest I can checkin bags at Heathrow for the longhaul leg of an Ex-EU?
Old Sep 22, 2017 | 3:55 am
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irishguy28
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If you are checking the bag in at PRG, it will go all the way through to SFO.

If you mean you want to additionally check a bag at LHR prior to departure to PRG, you can do it on the day of travel - but in this case from T5 (where your SFO flight departs from) rather than from T3 (where your PRG flight departs from).
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