August is the cheapest month to fly this route, with average fares around $1101 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $1386 | $1289 | Peak | |
| June 2026 | $1322 | $1181 | ||
| July 2026 | $1268 | $1149 | ||
| August 2026 | $1101 | $883 | Best |
Departing on Tuesday offers the lowest average fares at $1249. Thursday departures are the most expensive at $1341, a difference of $92.
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 Dallas to London is August, with average round-trip fares around $1101. The lowest fare found in August is $883.
Tuesday departures are the cheapest, averaging $1249 round trip. The most expensive day is Thursday at $1341.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $1386 compared to $1101 in the cheapest month. June is a solid middle-ground option at $1322.
Flying in August instead of May can save you approximately $285 per round trip. The cheapest month averages $1101 while the most expensive averages $1386.
Airlines, flight times, price calendar, and more for Dallas to London
View DFW → LHR Details