August is the cheapest month to fly this route, with average fares around $1154 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $1389 | $1254 | Peak | |
| June 2026 | $1312 | $1151 | ||
| July 2026 | $1269 | $1205 | ||
| August 2026 | $1154 | $1079 | Best |
Departing on Wednesday offers the lowest average fares at $1250. Friday departures are the most expensive at $1327, a difference of $77.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Phoenix to London is August, with average round-trip fares around $1154. The lowest fare found in August is $1079.
Wednesday departures are the cheapest, averaging $1250 round trip. The most expensive day is Friday at $1327.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $1389 compared to $1154 in the cheapest month. June is a solid middle-ground option at $1312.
Flying in August instead of May can save you approximately $235 per round trip. The cheapest month averages $1154 while the most expensive averages $1389.
Airlines, flight times, price calendar, and more for Phoenix to London
View PHX → LHR Details