Cheap flights from Seattle to Denver
The cheapest round trip from Seattle to Denver that travelers found recently is $282 with a carry-on: a $172 fare on Frontier plus about $110 for a carry-on both ways. It leaves Thu, Dec 3 and comes back Fri, Dec 4.
Live prices for Thu, Dec 3 to Fri, Dec 4
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Thu, Dec 3 | Fri, Dec 4 | Frontier | SEA → DEN | 1 stop | $172 | +$110 | $282 | Live price |
| Wed, Oct 14 | Sat, Oct 17 | Frontier | SEA → DEN | 1 stop | $366 | +$110 | $476 | 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 |
|---|---|---|---|
| October 2026 | Wed, Oct 14 to Sat, Oct 17, 3 nights | $476 | Live price |
| December 2026 | Thu, Dec 3 to Fri, Dec 4, 1 night | $282 | Live price |
Bag fees on this route
What the airlines flying Seattle to Denver 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 |
|---|---|---|
| Frontier | $55 | $50 |
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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