Cheap Flights from Denver to Seattle
Denver to Seattle is one of the busiest routes between USA and USA — 3 airlines fly it nonstop, with departures running from before dawn to almost midnight. Here's what it actually costs right now, which airlines to check first, and the days that consistently price lower.
Denver to Seattle covers about 1,022 mi (1,645 km) in the air, and most schedules come in around a roughly three-hour flight. Current pricing on this route starts near $100 round trip, with the lowest fares typically appearing on Tuesday departures. Booking 4-8 weeks ahead has historically produced the best average prices.
Flights operate on a daily basis from DEN to SEA, and multiple airlines serve the route. On-time performance matters here: roughly 22% of departures run late by 85 minutes or more on average, so building a little buffer into tight connections is worth doing. Evening flights tend to hold their schedule best.
For the cheapest seat, compare Tuesday departures against midweek dates and watch how the $100 entry fare moves as the date approaches. Travelers targeting October usually catch the seasonal low, while holiday weeks price up fast. Set a fare alert before booking and let the route's normal swing work for you.
Airlines Flying Denver to Seattle
3 airlines operate nonstop between Denver and Seattle:
| Airline | Nonstop | Notes |
|---|---|---|
| Multiple airlines | Nonstop | Highest frequency |
Flexible on layovers? Connecting flights via major hubs can sometimes be cheaper than flying direct. Use Flighko to compare both options and find the best deal for your schedule.
Best Time to Book & Fly Denver to Seattle
Finding cheap flights depends on timing. Here's what you need to know about the best time to fly from Denver to Seattle:
When to Book
Book 4-8 weeks ahead for the best average prices. Going further out can pay off for peak travel seasons and major events when demand spikes.
Best Day to Fly
Tuesday departures tend to be priced lower than other days, while Sunday departures are typically the most expensive.
Best Time of Day
Morning flights are generally cheaper than evening ones on this route. If your schedule allows, consider early departures for potential savings.
Best Month
October tends to offer the best prices for this route. Set a price alert on Flighko to catch fare drops in real time.
Are Denver to Seattle Flights Often Delayed?
Historical tracking shows roughly 22% of flights on this route run late, averaging around 85 minutes. Evening flightshave historically run more reliably — worth factoring in if you've got a tight connection.
How to Find Cheap Flights from Denver to Seattle
Here are proven strategies to help you find the cheapest flights on this route:
- Book in advance: For the best prices, book your flight 4-8 weeks before departure. Last-minute bookings typically cost 20-40% more.
- Be flexible with dates: Flying on Tuesdays can save you 15-25% compared to other days. Use Flighko's flexible date search to see prices across the entire month.
- Compare airlines: Don't settle for the first price you see. Flighko compares prices from 200+ airlines, including budget carriers and full-service airlines.
- Set price alerts: Not ready to book yet? Set a price alert on Flighko and we'll notify you when fares drop for your desired route.
- Consider nearby airports: Sometimes flying into or out of a nearby airport can save you hundreds of dollars. Check prices for alternate airports on Flighko.
- Travel during off-peak seasons: Avoid peak travel times like holidays and school breaks. Shoulder season travel (just before or after peak) often offers the best balance of good weather and low prices.
Flight Route Information
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