Boston Logan to London Heathrow liquid rules
BOS → LHR · United States → United Kingdom
100ml out, larger allowed back. Pack to 100ml for the outbound departure. The return airport's guidance allows larger containers for ordinary departures — check its exceptions.
Rule basis: Both airports have official guidance we can show (see each airport's source and check status).
What to do: Conservative packing fallback: containers of 100ml (3.4oz) or less in one clear quart-sized resealable bag, ready to take out at security. US airports (TSA 3-1-1) require a clear quart-sized resealable bag; the other airport's own bag rule is shown on its card. Exceptions: BOS: TSA lists medications and infant/child nourishment as exemptions to the 3.4oz (100ml) limit — tell the officer; they may need extra screening. BOS: Duty-free liquids over 3.4oz (100ml) are allowed only on international journeys connecting in the US, in the retailer's sealed tamper-evident bag with the receipt (bought within 48 hours), and must still pass screening. LHR: Flights to Australia: liquids in containers over 100ml can't be taken. LHR: Metal and insulated containers (e.g. flasks) must be empty.
Liquid Limits is a travel planning tool, not an official aviation source. Always confirm with the airport before you travel.
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Outbound · BOS
- TSA lists medications and infant/child nourishment as exemptions to the 3.4oz (100ml) limit — tell the officer; they may need extra screening.
- Duty-free liquids over 3.4oz (100ml) are allowed only on international journeys connecting in the US, in the retailer's sealed tamper-evident bag with the receipt (bought within 48 hours), and must still pass screening.
Return · LHR
- Flights to Australia: liquids in containers over 100ml can't be taken.
- Metal and insulated containers (e.g. flasks) must be empty.
What to pack in cabin baggage
Conservative packing fallback: containers of 100ml (3.4oz) or less in one clear quart-sized resealable bag, ready to take out at security. US airports (TSA 3-1-1) require a clear quart-sized resealable bag; the other airport's own bag rule is shown on its card. This works at both BOS and LHR, including any exceptions listed above. Keep medications and contact lens solution accessible — they can usually go above the limit.
What to check in hold luggage
Full-size shampoo, perfume, sunscreen, olive oil, jam — anything over the limit. Wrap glass in clothes and seal liquids in plastic bags in case pressure changes pop the lids.
Common items people lose on this route
Packing checklist for BOS → LHR
A short checklist for this trip — pack what you need to stay within the rules above.
Match the stricter airport's 100ml limit.
Required for liquids at the security tray.
Anything bigger goes in the hold.
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