Flights Denver → Chicago
As of October 2026, economy flights from Denver to Chicago have a typical range USD 259–809, median USD 279. Full range across all 139 offers: USD 167–2498. We analyzed 139 offers from 8 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Denver → Chicago
Based on 139 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Denver → Chicago
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Frontier | — | — | — |
| Southwest Airlines | Included | Included | — |
| United | Included | USD 35 | — |
| American Airlines | Included | USD 35 | — |
| Southwest | — | USD 45 | — |
| Delta | Included | USD 45 | — |
| Delta | — | USD 45 | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Denver to Chicago cost?
Based on 139 offers · October 2026
Denver to Chicago flights ranged from USD 167 to USD 2498 across 139 offers analyzed in October 2026. The chart below shows how prices distributed across all 139 offers.
These 139 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 274 and USD 432
What hidden fees do Denver to Chicago flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Denver to Chicago routes. The breakdown below is based on 139 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| F9 | 18 | 4% |
| WN | 0 | 0% |
| UA | 45 | 10% |
| AA | 46 | 14% |
| Southwest | 45 | 16% |
| DL | 33 | 4% |
| Delta | 45 | 16% |
American Airlines: base ~USD 233 + fees USD 46 = ~USD 279 total. Frontier Airlines: base ~USD 323 + fees USD 18 = ~USD 341 total.
American Airlines's USD 46 ancillary fees narrow the gap with Frontier Airlines's lower-fee model — the USD 90 base difference shrinks to USD 62 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Denver to Chicago?
8 airlines flew Denver to Chicago in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (Frontier), fares ranged USD 195–221 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier | 5 | 195–221 | 195 | n/a |
 United Airlines | 20 | 268–819 | 268 | 45 (17%) |
 American Airlines | 33 | 268–556 | 279 | 46 (17%) |
 Southwest | 16 | — | 279 | 45 (16%) |
 Delta | 1 | — | 279 | 45 (16%) |
 Southwest Airlines | 21 | 274–390 | 303 | 0 (0%) |
 Frontier Airlines | 21 | 182–671 | 341 | 18 (5%) |
 Delta Air Lines | 22 | 279–1570 | 763 | 33 (4%) |
Where do the best Denver → Chicago prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Denver to Chicago flights
- Full-service carriers on Denver–Chicago cost 1.4x more than budget airlines (USD 397 vs USD 280 median; overall median USD 279).
- AA charges 2.6x more in ancillary fees than F9 — USD 46 vs USD 18 avg per booking.
- The same route priced USD 487 apart depending on where it was booked — the lowest median was USD 276. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Denver to Chicago cost?
- Based on 139 offers analyzed, Denver to Chicago flights range from USD 167 to USD 2498, with a median price of USD 279. Search for your specific dates →
- What hidden fees should I expect on Denver to Chicago flights?
- On average, ancillary fees (bags, seat selection) add USD 32 to the base fare on Denver to Chicago flights. See itemized fees for your itinerary →
- Which airline is cheapest on Denver to Chicago including all fees?
- Frontier has the lowest median fare on Denver to Chicago at USD 195 (median across 5 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Denver–Chicago flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 276. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Denver to Chicago routes?
- Denver to Chicago has 8 airlines competing, creating a price range from USD 167 to USD 2498 across 139 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
8 airlines compete on this route — we check every one
Find flights for my datesNew route — be among the first to track this itinerary
Building with flight data? Power your app or agent with LetsFG
The same multi-source search behind this page — every airline and the major booking sites, deduplicated and ranked — is available to your app or AI agent. Natural-language or structured queries, live prices, zero price bias.
Try the free sandbox — no card →Free sandbox, instant fake results · email for a key · Bearer-token auth · MCP, Python & JS SDKs · letsfg.co/developers