Chicago (ORD) to Seattle (SEA), Mar 21, 2027: from $109 one way

Chicago (ORD) to Seattle (SEA), Mar 21, 2027: from $109 one way on Axel, checked Nov 14, 2026. Lowest published fare: $109 one way, Axel-exclusive, Frontier Airlines, 1 stop, Mar 21, 2027, 1 adult, economy, checked Nov 14, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Route overview: Chicago to Seattle (SEA) flight deals

2027-03-21 · one way · Axel-exclusive $173

• Alaska Airlines AS587: ORD 2027-03-21 06:00:00 → SEA 2027-03-21 08:57:00; nonstop; 297 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $178

• United Airlines UA2099: ORD 2027-03-21 08:55:00 → SEA 2027-03-21 11:44:00; nonstop; 289 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $178

• American Airlines AA2112: ORD 2027-03-21 06:54:00 → SEA 2027-03-21 09:52:00; nonstop; 298 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $184

• Delta Air Lines DL637: ORD 2027-03-21 17:55:00 → SEA 2027-03-21 20:42:00; nonstop; 287 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $109

• Frontier Airlines F91483 / F9605: ORD 2027-03-21 06:30:00 → SEA 2027-03-21 12:22:00; 1 stop(s) via DEN; 472 minutes. Local airport times.
  • F91483: ORD 2027-03-21 06:30:00 → DEN 2027-03-21 08:26:00; layover at DEN: 102 minutes.
  • F9605: DEN 2027-03-21 10:08:00 → SEA 2027-03-21 12:22:00.

2027-03-21 · one way · Axel-exclusive $173

• Alaska Airlines AS407: ORD 2027-03-21 15:59:00 → SEA 2027-03-21 18:48:00; nonstop; 289 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $178

• American Airlines AA2392: ORD 2027-03-21 21:53:00 → SEA 2027-03-22 00:35:00; nonstop; 282 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $178

• United Airlines UA1764: ORD 2027-03-21 13:35:00 → SEA 2027-03-21 16:19:00; nonstop; 284 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $184

• Delta Air Lines DL2041: ORD 2027-03-21 06:00:00 → SEA 2027-03-21 08:54:00; nonstop; 294 minutes. Local airport times.

2027-03-21 · one way · Axel-exclusive $167

• American Airlines AA562 / AS2284: ORD 2027-03-21 09:45:00 → SEA 2027-03-21 14:52:00; 1 stop(s) via PDX; 427 minutes. Local airport times.
  • AA562: ORD 2027-03-21 09:45:00 → PDX 2027-03-21 12:37:00; layover at PDX: 75 minutes.
  • AS2284: PDX 2027-03-21 13:52:00 → SEA 2027-03-21 14:52:00.

2027-03-21 · one way · Axel-exclusive $167

• American Airlines AA4189 / AS3138: ORD 2027-03-21 09:40:00 → SEA 2027-03-21 14:44:00; 1 stop(s) via MSO; 424 minutes. Local airport times.
  • AA4189: ORD 2027-03-21 09:40:00 → MSO 2027-03-21 12:36:00; layover at MSO: 83 minutes.
  • AS3138: MSO 2027-03-21 13:59:00 → SEA 2027-03-21 14:44:00.

2027-03-21 · one way · Axel-exclusive $167

• American Airlines AA2036 / AS359: ORD 2027-03-21 10:00:00 → SEA 2027-03-21 14:49:00; 1 stop(s) via BOI; 409 minutes. Local airport times.
  • AA2036: ORD 2027-03-21 10:00:00 → BOI 2027-03-21 12:59:00; layover at BOI: 66 minutes.
  • AS359: BOI 2027-03-21 14:05:00 → SEA 2027-03-21 14:49:00.

2027-03-21 · one way · Axel-exclusive $173

• United Airlines UA1498 / AC8804: ORD 2027-03-21 08:58:00 → SEA 2027-03-21 14:32:00; 1 stop(s) via YVR; 454 minutes. Local airport times.
  • UA1498: ORD 2027-03-21 08:58:00 → YVR 2027-03-21 11:45:00; layover at YVR: 105 minutes.
  • AC8804: YVR 2027-03-21 13:30:00 → SEA 2027-03-21 14:32:00.

2027-03-21 · one way · Axel-exclusive $173

• United Airlines UA2495 / UA2302: ORD 2027-03-21 08:40:00 → SEA 2027-03-21 13:35:00; 1 stop(s) via DEN; 415 minutes. Local airport times.
  • UA2495: ORD 2027-03-21 08:40:00 → DEN 2027-03-21 10:26:00; layover at DEN: 64 minutes.
  • UA2302: DEN 2027-03-21 11:30:00 → SEA 2027-03-21 13:35:00.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

• All dates for this route
• Mar 20, 2027 · Return options
• Mar 22, 2027 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Chicago (ORD) to Seattle (SEA) · Mar 21, 2027 · one way: 1 adult in economy, every priced fare with its flights, times and total, each with its displayed check date.
• Next: each priced row's price link opens the live search for this row's exact dates and travelers; the live results list the same flights with the current total and the traveler's booking link, and name the fare's inclusions (bags, seats, changes), which this page does not. A changed price or flight shows there. Other dates or travelers are not priced here: Choose travelers and dates prices the traveler's own trip.
• Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
• If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Chicago to Seattle (SEA) flight deals · Flight search guide.
• Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.

Feedback (optional): Missing info · Axel issue