Cheap Flights From Seattle - Tacoma Intl. (SEA) To Denver Intl. (DEN)

Your next incredible adventure is on the opposite side of a single flight. You can travel direct from Sea-Tac Airport to DIA airport with multiple airlines, including United Airlines and Southwest Airlines.

If you’re eager to fly direct from SEA to Denver Intl. Airport (DEN), you won’t have a problem finding a fare. Listed below are the most in-demand airlines that will fly you straight to Denver:

• United Airlines - (UA) with 182 flights every month
• Southwest Airlines - (WN) with 178 flights every month
• Alaska Airlines - (AS) with 121 flights every month
• Delta - (DL) with 121 flights every month

Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you’re looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you’re browsing flight deals.

Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.

Here’s the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.