Cheap flights from Denver to Seattle
The cheapest round trip from Denver to Seattle that travelers found recently is $258 with a carry-on: a $258 fare on Alaska Airlines, which usually includes a carry-on. It leaves Sun, Jun 20 and comes back Mon, Jun 28.
Live prices for Sun, Jun 20 to Mon, Jun 28
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Sun, Jun 20 | Mon, Jun 28 | Alaska Airlines | DEN → SEA | 1 stop | $258 | Included | $258 | Live price |
| Wed, Nov 25 | Sun, Nov 29 | Alaska Airlines | DEN → SEA | Nonstop | $310 | Included | $310 | Live price |
Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.
Cheapest month to fly
| Month | Cheapest trip | From | Live prices |
|---|---|---|---|
| November 2026 | Wed, Nov 25 to Sun, Nov 29, 4 nights | $310 | Live price |
| June 2027 | Sun, Jun 20 to Mon, Jun 28, 8 nights | $258 | Live price |
Bag fees on this route
What the airlines flying Denver to Seattle usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.
| Airline | Carry-on, each way | Checked bag, each way |
|---|---|---|
| Alaska Airlines | Included | $40 |
Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.
How these prices work
These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).
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