Find cheap flights from Seattle to Boulder - Compare and Save

When flying out of Seattle you’ll be using Seattle/Tacoma Intl. Boulder does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 33.4 mi away.

Direct flights cover the 1,022 miles separating Seattle and Boulder in about 2h 30m.

49 direct flights run between Seattle and Boulder on a daily basis. On average, there are about 343 departures each week.

Consider leaving on a Thursday and avoid Saturdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Wednesdays and the most expensive ones on Saturdays.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Boulder.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boulder with an airline and back to Seattle with another airline.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boulder from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

In the last 5 days, the cheapest one-way ticket between Seattle and Boulder found on KAYAK was with Frontier for $29. Frontier offered a round-trip connection from $55 and Delta from $97.