July is the cheapest month to fly this route, with average fares around $223 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $226 | $205 | ||
| June 2026 | $247 | $191 | Peak | |
| July 2026 | $223 | $192 | Best | |
| August 2026 | $223 | $206 |
Departing on Tuesday offers the lowest average fares at $204. Sunday departures are the most expensive at $266, a difference of $62.
The best time to fly is July. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Boston to Denver is July, with average round-trip fares around $223. The lowest fare found in July is $192.
Tuesday departures are the cheapest, averaging $204 round trip. The most expensive day is Sunday at $266.
Based on current pricing trends, booking for July travel offers the best value. Avoid June if possible, as fares average $247 compared to $223 in the cheapest month. May is a solid middle-ground option at $226.
Flying in July instead of June can save you approximately $24 per round trip. The cheapest month averages $223 while the most expensive averages $247.
Airlines, flight times, price calendar, and more for Boston to Denver
View BOS → DEN Details