August is the cheapest month to fly this route, with average fares around $934 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $1218 | $1120 | ||
| June 2026 | $1226 | $1099 | Peak | |
| July 2026 | $1094 | $1026 | ||
| August 2026 | $934 | $870 | Best |
Departing on Tuesday offers the lowest average fares at $1125. Friday departures are the most expensive at $1199, a difference of $74.
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 Denver to London is August, with average round-trip fares around $934. The lowest fare found in August is $870.
Tuesday departures are the cheapest, averaging $1125 round trip. The most expensive day is Friday at $1199.
Based on current pricing trends, booking for August travel offers the best value. Avoid June if possible, as fares average $1226 compared to $934 in the cheapest month. May is a solid middle-ground option at $1218.
Flying in August instead of June can save you approximately $292 per round trip. The cheapest month averages $934 while the most expensive averages $1226.
Airlines, flight times, price calendar, and more for Denver to London
View DEN → LHR Details