Cheap Flights from Sydney to London
Round-trip economy fares between Sydney (SYD) and London (LHR) average A$2,104 across the year. Book for January and typical prices fall to A$1,725. The 17,020 km hop takes about 20.6 hours non-stop, and the nicest window to visit London is May – September.
Today's tracked low
A$1,587 −8% vs. seasonal low
Not flying from Sydney? See London deals from your nearest hub.
When is the cheapest time to fly from Sydney to London?
Average round-trip economy fare by departure month. January is the statistical sweet spot at A$1,725.
| Month | Avg. round-trip | vs. yearly average |
|---|---|---|
| January Cheapest | A$1,725 | −A$379 |
| February | A$1,767 | −A$337 |
| March | A$1,978 | −A$126 |
| April | A$2,146 | +A$42 |
| May | A$2,314 | +A$210 |
| June | A$2,525 | +A$421 |
| July | A$2,651 | +A$547 |
| August | A$2,567 | +A$463 |
| September | A$2,188 | +A$84 |
| October | A$2,020 | −A$84 |
| November | A$1,852 | −A$252 |
| December | A$2,272 | +A$168 |
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Sydney to London flight FAQs
- What is the cheapest month to fly from Sydney to London?
- January is typically cheapest, with round-trips from A$1,725 — about A$379 under the yearly average of A$2,104.
- How long is the flight from Sydney to London?
- Non-stop services cover the 17,020 km route in roughly 20.6 hours.
- When is the best time to visit London?
- May – September. Entry requirements: UK ETA required for visa-exempt nationals since 2025.