Flights Denver → San Diego
As of October 2026, economy flights from Denver to San Diego have a typical range USD 226–1317, median USD 397. Full range across all 185 offers: USD 118–1907. We analyzed 185 offers from 5 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 → San Diego
Based on 185 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Denver → San Diego
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Frontier Airlines | USD 190 | USD 189 | — |
| Alaska Airlines | Included | USD 35 | — |
| United | Included | USD 35 | — |
| Alaska | — | USD 90 | — |
| Southwest Airlines | Included | 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 Denver to San Diego cost?
Based on 185 offers · October 2026
Denver to San Diego flights ranged from USD 118 to USD 1907 across 185 offers analyzed in October 2026. The chart below shows how prices distributed across all 185 offers.
These 185 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 332 and USD 607
What hidden fees do Denver to San Diego flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Denver to San Diego routes. The breakdown below is based on 185 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| F9 | 101 | 39% |
| AS | 20 | 5% |
| UA | 31 | 4% |
| Alaska | 90 | 30% |
| WN | 42 | 9% |
Frontier Airlines: base ~USD 161 + fees USD 101 = ~USD 262 total. Alaska Airlines: base ~USD 330 + fees USD 20 = ~USD 350 total.
Frontier Airlines's USD 101 ancillary fees narrow the gap with Alaska Airlines's lower-fee model — the USD 169 base difference shrinks to USD 88 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 San Diego?
5 airlines flew Denver to San Diego 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 Airlines), fares ranged USD 174–358 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 Airlines | 18 | 174–358 | 262 | 101 (38%) |
 Alaska | 3 | 237–349 | 317 | 90 (28%) |
 Alaska Airlines | 26 | 199–617 | 350 | 20 (6%) |
 United Airlines | 59 | 226–1782 | 367 | 31 (9%) |
 Southwest Airlines | 79 | 353–655 | 464 | 42 (9%) |
Where do the best Denver → San Diego 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 San Diego flights
- Full-service carriers on Denver–San Diego cost 1.0x more than budget airlines (USD 345 vs USD 363 median; overall median USD 397).
- F9 charges 4.9x more in ancillary fees than AS — USD 101 vs USD 20 avg per booking.
- The same route priced USD 1268 apart depending on where it was booked — the lowest median was USD 174. 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 San Diego cost?
- Based on 185 offers analyzed, Denver to San Diego flights range from USD 118 to USD 1907, with a median price of USD 397. Search for your specific dates →
- What hidden fees should I expect on Denver to San Diego flights?
- On average, ancillary fees (bags, seat selection) add USD 42 to the base fare on Denver to San Diego flights. See itemized fees for your itinerary →
- Which airline is cheapest on Denver to San Diego including all fees?
- Frontier Airlines has the lowest median fare on Denver to San Diego at USD 262 (median across 18 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Denver–San Diego 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 174. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Denver to San Diego routes?
- Denver to San Diego has 5 airlines competing, creating a price range from USD 118 to USD 1907 across 185 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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