Cheap flights from Chicago to Seattle
The cheapest round trip from Chicago to Seattle that travelers found recently is $258 with a carry-on: a $258 fare on United, which usually includes a carry-on. It leaves Mon, Nov 16 and comes back Mon, Nov 23.
Live prices for Mon, Nov 16 to Mon, Nov 23
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Mon, Nov 16 | Mon, Nov 23 | United | ORD → SEA | 1 stop | $258 | Included | $258 | Live price |
| Thu, May 13 | Thu, May 27 | Alaska Airlines | ORD → SEA | 1 stop | $262 | Included | $262 | Live price |
| Tue, Nov 3 | Fri, Nov 6 | Frontier | ORD → SEA | 2 stops | $180 | +$110 | $290 | Live price |
| Tue, Nov 3 | Sat, Nov 7 | Frontier | ORD → SEA | 3 stops | $232 | +$110 | $342 | Live price |
| Sun, Nov 1 | Tue, Nov 3 | American Airlines | ORD → SEA | 1 stop | $397 | Included | $397 | Live price |
| Wed, Nov 25 | Sun, Nov 29 | Alaska Airlines | ORD → SEA | 1 stop | $414 | Included | $414 | 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 | Mon, Nov 16 to Mon, Nov 23, 7 nights | $258 | Live price |
| May 2027 | Thu, May 13 to Thu, May 27, 14 nights | $262 | Live price |
Bag fees on this route
What the airlines flying Chicago 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 |
| American Airlines | Included | $40 |
| Frontier | $55 | $50 |
| United | 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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