Cheap flights from Portland to Denver from $102

The cheapest month to fly to Denver from Portland is in January. Flight prices, which tend to average around $201, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in January, then you should wait until November to fly from Portland, when ticket prices are also cheap, with an average price of $220.

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $369. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Monday, with ticket prices averaging around $456.

The cheapest time of day to fly to Denver is in the afternoon when flights can be purchased for as low as $334. Flights in the morning are often more expensive with an average ticket price of $403.

Fly from Portland to Denver Intl for the best Portland - Denver Intl flight prices

You are more likely to see cheaper flights to Denver from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $258 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Portland for as low as $226 on momondo.

There are 4 cabin classes available to choose from on Portland to Denver flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Alaska Airlines, and Delta are the most popular carriers operating from Portland to Denver Intl

United Airlines, Frontier and Alaska Airlines are the top three most popular airlines that fly to Denver from Portland according to our data. United Airlines is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 6 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Historically, on average around 12% of flights between Portland and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 135 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Sunday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 6% of their flights experiencing any sort of delay.

11 flights are operational daily from Portland to Denver as of September 2026. The most popular departure time for this route is 12:00PM, with 57% of flights per day taking off in the afternoon.

As of September 2026, there are 77 flights per week flying from Portland to Denver. The most common day of the week flights depart is Thu, with 26% of flights taking off on this day.