Flights Chicago → Denver
As of October 2026, economy flights from Chicago to Denver have a typical range USD 335–635, median USD 345. Full range across all 283 offers: USD 296–956. We found 43% of 283 offers from budget carriers (around USD 335) and 57% from full-service carriers (around USD 345).
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: Chicago → Denver
Based on 283 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Chicago → Denver
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| American Airlines | Included | USD 35 | — |
| United Airlines | Included | USD 35 | — |
| United | — | USD 100 | — |
| Frontier | USD 118 | USD 130 | — |
| Southwest Airlines | Included | Included | — |
| Delta | Included | USD 35 | — |
| Alaska Airlines | Included | — | — |
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 Chicago to Denver cost?
Based on 283 offers · October 2026
Chicago to Denver flights ranged from USD 296 to USD 956 across 283 offers analyzed in October 2026. Two fare clusters detected: budget fares around 329 and premium fares around 593 The chart below shows how prices distributed across all 283 offers.
These 283 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 335 and USD 420
What hidden fees do Chicago to Denver flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Chicago to Denver routes. The breakdown below is based on 283 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| AA | 45 | 13% |
| UA | 45 | 13% |
| United | 100 | 30% |
| F9 | 123 | 30% |
| WN | 45 | 9% |
| DL | 45 | 6% |
| AS | 10 | 1% |
Frontier Airlines: base ~USD 252 + fees USD 123 = ~USD 375 total. Alaska Airlines: base ~USD 788 + fees USD 10 = ~USD 798 total.
Frontier Airlines's USD 123 ancillary fees narrow the gap with Alaska Airlines's lower-fee model — the USD 536 base difference shrinks to USD 423 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 Chicago to Denver?
8 airlines flew Chicago to Denver in this dataset. The route shows a clear split between low-cost and full-service carriers. 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.
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier | 1 | — | 296 | n/a |
 United Airlines | 117 | 335–386 | 335 | 45 (13%) |
 United | 4 | — | 335 | 100 (30%) |
 American Airlines | 65 | 335–345 | 345 | 45 (13%) |
 Frontier Airlines | 24 | 357–508 | 375 | 123 (33%) |
 Southwest Airlines | 50 | 395–635 | 538 | 45 (8%) |
 Alaska Airlines | 1 | — | 798 | 10 (1%) |
 Delta Air Lines | 21 | 706–956 | 826 | 45 (5%) |
Where do the best Chicago → Denver 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: Chicago to Denver flights
- Full-service carriers on Chicago–Denver cost 1.3x more than budget airlines (USD 528 vs USD 403 median; overall median USD 345).
- F9 charges 12.3x more in ancillary fees than AS — USD 123 vs USD 10 avg per booking.
- The same route priced USD 329 apart depending on where it was booked — the lowest median was USD 296. 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 Chicago to Denver cost?
- Based on 283 offers analyzed, Chicago to Denver flights range from USD 296 to USD 956, with a median price of USD 345. Search for your specific dates →
- What hidden fees should I expect on Chicago to Denver flights?
- On average, ancillary fees (bags, seat selection) add USD 52 to the base fare on Chicago to Denver flights. See itemized fees for your itinerary →
- Which airline is cheapest on Chicago to Denver including all fees?
- Frontier has the lowest median fare on Chicago to Denver at USD 296 (median across 1 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Chicago–Denver 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 296. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Chicago to Denver routes?
- Chicago to Denver has 8 airlines competing, creating a price range from USD 296 to USD 956 across 283 offers. There are two distinct fare clusters on this route: budget options and premium fares. Find where your trip lands in the distribution →
8 airlines, two price clusters — find which fits your budget
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