Flights Detroit → San José (Alajuela)
As of October 2026, economy flights from Detroit to San José (Alajuela) have a typical range USD 948–1451, median USD 1025. Full range across all 194 offers: USD 645–5543. We analyzed 194 offers from 9 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: Detroit → San José (Alajuela)
Based on 194 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Detroit → San José (Alajuela)
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| JetBlue | Included | — | — |
| Frontier Airlines | — | — | — |
| Air Canada | Included | USD 30 | — |
| United | Included | USD 35 | — |
| American Airlines | Included | USD 35 | — |
| Copa | Included | USD 40 | — |
| Delta | Included | USD 35 | — |
| Avianca | Included | USD 30 | — |
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 Detroit to San José (Alajuela) cost?
Based on 194 offers · October 2026
Detroit to San José (Alajuela) flights ranged from USD 645 to USD 5543 across 194 offers analyzed in October 2026. The chart below shows how prices distributed across all 194 offers.
These 194 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 990 and USD 1149
What hidden fees do Detroit to San José (Alajuela) flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Detroit to San José (Alajuela) routes. The breakdown below is based on 194 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| B6 | 10 | 1% |
| F9 | 10 | 1% |
| AC | 42 | 4% |
| UA | 38 | 3% |
| AA | 47 | 5% |
| CM | 55 | 5% |
| DL | 32 | 2% |
| AV | 40 | 3% |
Air Canada: base ~USD 867 + fees USD 42 = ~USD 909 total. B6: base ~USD 938 + fees USD 10 = ~USD 948 total.
Air Canada's USD 42 ancillary fees narrow the gap with B6's lower-fee model — the USD 71 base difference shrinks to USD 39 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.CM charges 5.5x more in ancillary fees than F9 on this route. Compare total-cost options when booking.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Detroit to San José (Alajuela)?
9 airlines flew Detroit to San José (Alajuela) 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 670–1249 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 | 4 | 670–1249 | 901 | 10 (1%) |
 Air Canada | 3 | 908–1295 | 909 | 42 (5%) |
 B6 | 6 | 748–1078 | 948 | 10 (1%) |
 United | 14 | — | 948 | n/a |
 United Airlines | 32 | 947–1371 | 989 | 38 (4%) |
 American Airlines | 65 | 986–1122 | 990 | 47 (5%) |
 Copa Airlines | 36 | 1025–1149 | 1025 | 55 (5%) |
 Avianca | 2 | 1285–1489 | 1387 | 40 (3%) |
 Delta Air Lines | 32 | 1070–4127 | 1451 | 32 (2%) |
Where do the best Detroit → San José (Alajuela) prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from travel agency 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: Detroit to San José (Alajuela) flights
- Full-service carriers on Detroit–San José (Alajuela) cost 1.2x more than budget airlines (USD 1100 vs USD 924 median; overall median USD 1025).
- CM charges 5.5x more in ancillary fees than F9 — USD 55 vs USD 10 avg per booking.
- The same route priced USD 250 apart depending on where it was booked — the lowest median was USD 948. 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 Detroit to San José (Alajuela) cost?
- Based on 194 offers analyzed, Detroit to San José (Alajuela) flights range from USD 645 to USD 5543, with a median price of USD 1025. Search for your specific dates →
- What hidden fees should I expect on Detroit to San José (Alajuela) flights?
- On average, ancillary fees (bags, seat selection) add USD 42 to the base fare on Detroit to San José (Alajuela) flights. See itemized fees for your itinerary →
- Which airline is cheapest on Detroit to San José (Alajuela) including all fees?
- Frontier Airlines has the lowest median fare on Detroit to San José (Alajuela) at USD 901 (median across 4 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Detroit–San José (Alajuela) 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 948. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Detroit to San José (Alajuela) routes?
- Detroit to San José (Alajuela) has 9 airlines competing, creating a price range from USD 645 to USD 5543 across 194 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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